1
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Gaudry A, Pagni M, Mehl F, Moretti S, Quiros-Guerrero LM, Cappelletti L, Rutz A, Kaiser M, Marcourt L, Queiroz EF, Ioset JR, Grondin A, David B, Wolfender JL, Allard PM. A Sample-Centric and Knowledge-Driven Computational Framework for Natural Products Drug Discovery. ACS Cent Sci 2024; 10:494-510. [PMID: 38559298 PMCID: PMC10979503 DOI: 10.1021/acscentsci.3c00800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The ENPKG framework organizes large heterogeneous metabolomics data sets as a knowledge graph, offering exciting opportunities for drug discovery and chemodiversity characterization.
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Affiliation(s)
- Arnaud Gaudry
- Institute of Pharmaceutical
Sciences of Western Switzerland, University
of Geneva, 1211 Geneva 4, Switzerland
- School of Pharmaceutical Sciences, University
of Geneva, 1211 Geneva 4, Switzerland
| | - Marco Pagni
- Vital-IT, SIB Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Florence Mehl
- Vital-IT, SIB Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Sébastien Moretti
- Vital-IT, SIB Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Luis-Manuel Quiros-Guerrero
- Institute of Pharmaceutical
Sciences of Western Switzerland, University
of Geneva, 1211 Geneva 4, Switzerland
- School of Pharmaceutical Sciences, University
of Geneva, 1211 Geneva 4, Switzerland
| | - Luca Cappelletti
- Department of Biology, University of Fribourg, 1700 Fribourg, Switzerland
| | - Adriano Rutz
- Institute of Pharmaceutical
Sciences of Western Switzerland, University
of Geneva, 1211 Geneva 4, Switzerland
- School of Pharmaceutical Sciences, University
of Geneva, 1211 Geneva 4, Switzerland
| | - Marcel Kaiser
- Department of Medical
and Parasitology and Infection Biology, Swiss Tropical and Public Health Institute, 4123 Allschwil, Switzerland
- Faculty of Science, University of Basel, 4002 Basel, Switzerland
| | - Laurence Marcourt
- Institute of Pharmaceutical
Sciences of Western Switzerland, University
of Geneva, 1211 Geneva 4, Switzerland
- School of Pharmaceutical Sciences, University
of Geneva, 1211 Geneva 4, Switzerland
| | - Emerson Ferreira Queiroz
- Institute of Pharmaceutical
Sciences of Western Switzerland, University
of Geneva, 1211 Geneva 4, Switzerland
- School of Pharmaceutical Sciences, University
of Geneva, 1211 Geneva 4, Switzerland
| | - Jean-Robert Ioset
- Drugs
for Neglected Diseases Initiative (DNDi), 1202 Geneva, Switzerland
| | - Antonio Grondin
- Green Mission Pierre Fabre, Institut de Recherche Pierre Fabre, 31562 Toulouse, France
| | - Bruno David
- Green Mission Pierre Fabre, Institut de Recherche Pierre Fabre, 31562 Toulouse, France
| | - Jean-Luc Wolfender
- Institute of Pharmaceutical
Sciences of Western Switzerland, University
of Geneva, 1211 Geneva 4, Switzerland
- School of Pharmaceutical Sciences, University
of Geneva, 1211 Geneva 4, Switzerland
| | - Pierre-Marie Allard
- Institute of Pharmaceutical
Sciences of Western Switzerland, University
of Geneva, 1211 Geneva 4, Switzerland
- School of Pharmaceutical Sciences, University
of Geneva, 1211 Geneva 4, Switzerland
- Department of Biology, University of Fribourg, 1700 Fribourg, Switzerland
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2
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Scherrer M, Lee CW, Schmid H, Moselund KE. Single-Mode Laser in the Telecom Range by Deterministic Amplification of the Topological Interface Mode. ACS Photonics 2024; 11:1006-1011. [PMID: 38523747 PMCID: PMC10958602 DOI: 10.1021/acsphotonics.3c01372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 01/29/2024] [Accepted: 01/29/2024] [Indexed: 03/26/2024]
Abstract
Photonic integrated circuits are paving the way for novel on-chip functionalities with diverse applications in communication, computing, and beyond. The integration of on-chip light sources, especially single-mode lasers, is crucial for advancing those photonic chips to their full potential. Recently, novel concepts involving topological designs introduced a variety of options for tuning device properties, such as the desired single-mode emission. Here, we introduce a novel cavity design that allows amplification of the topological interface mode by deterministic placement of gain material within a topological lattice. The proposed design is experimentally implemented by a selective epitaxy process to achieve closely spaced Si and InGaAs nanorods embedded within the same layer. This results in the first demonstration of a single-mode laser in the telecom band using the concept of amplified topological modes without introducing artificial losses.
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Affiliation(s)
- Markus Scherrer
- Science
of Quantum and Information Technology, IBM
Research Europe-Zurich, 8803 Rüschlikon, Switzerland
| | - Chang-Won Lee
- Institute
of Advanced Optics and Photonics, Hanbat
National University, 34158 Daejeon, South
Korea
| | - Heinz Schmid
- Science
of Quantum and Information Technology, IBM
Research Europe-Zurich, 8803 Rüschlikon, Switzerland
| | - Kirsten E. Moselund
- Laboratory
of Nano and Quantum Technologies (LNQ), Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
- Integrated
Nanoscale Photonics and Optoelectronics Laboratory (INPhO), Ecole Polytechnique Fédérale de Lausanne
(EPFL), 1015 Lausanne, Switzerland
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3
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Schnitzer T, Schnurr M, Zahrt AF, Sakhaee N, Denmark SE, Wennemers H. Machine Learning to Develop Peptide Catalysts-Successes, Limitations, and Opportunities. ACS Cent Sci 2024; 10:367-373. [PMID: 38435528 PMCID: PMC10906243 DOI: 10.1021/acscentsci.3c01284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 01/02/2024] [Accepted: 01/03/2024] [Indexed: 03/05/2024]
Abstract
Peptides have been established as modular catalysts for various transformations. Still, the vast number of potential amino acid building blocks renders the identification of peptides with desired catalytic activity challenging. Here, we develop a machine-learning workflow for the optimization of peptide catalysts. First-in a hypothetical competition-we challenged our workflow to identify peptide catalysts for the conjugate addition reaction of aldehydes to nitroolefins and compared the performance of the predicted structures with those optimized in our laboratory. On the basis of the positive results, we established a universal training set (UTS) containing 161 catalysts to sample an in silico library of ∼30,000 tripeptide members. Finally, we challenged our machine learning strategy to identify a member of the library as a stereoselective catalyst for an annulation reaction that has not been catalyzed by a peptide thus far. We conclude with a comparison of data-driven versus expert-knowledge-guided peptide catalyst optimization.
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Affiliation(s)
- Tobias Schnitzer
- Laboratory
of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
| | - Martin Schnurr
- Laboratory
of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
| | - Andrew F. Zahrt
- Roger
Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Nader Sakhaee
- Roger
Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Scott E. Denmark
- Roger
Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Helma Wennemers
- Laboratory
of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
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4
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Jiang Y, Mingard C, Huber SM, Takhaveev V, McKeague M, Kizaki S, Schneider M, Ziegler N, Hürlimann V, Hoeng J, Sierro N, Ivanov NV, Sturla SJ. Correction to "Quantification and Mapping of Alkylation in the Human Genome Reveal Single Nucleotide Resolution Precursors of Mutational Signatures". ACS Cent Sci 2024; 10:487. [PMID: 38435521 PMCID: PMC10906244 DOI: 10.1021/acscentsci.3c01597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Indexed: 03/05/2024]
Abstract
[This corrects the article DOI: 10.1021/acscentsci.2c01100.].
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5
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Tinzl M, Diedrich JV, Mittl PRE, Clémancey M, Reiher M, Proppe J, Latour JM, Hilvert D. Myoglobin-Catalyzed Azide Reduction Proceeds via an Anionic Metal Amide Intermediate. J Am Chem Soc 2024; 146:1957-1966. [PMID: 38264790 PMCID: PMC10811658 DOI: 10.1021/jacs.3c09279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 12/11/2023] [Accepted: 12/11/2023] [Indexed: 01/25/2024]
Abstract
Nitrene transfer reactions catalyzed by heme proteins have broad potential for the stereoselective formation of carbon-nitrogen bonds. However, competition between productive nitrene transfer and the undesirable reduction of nitrene precursors limits the broad implementation of such biocatalytic methods. Here, we investigated the reduction of azides by the model heme protein myoglobin to gain mechanistic insights into the factors that control the fate of key reaction intermediates. In this system, the reaction proceeds via a proposed nitrene intermediate that is rapidly reduced and protonated to give a reactive ferrous amide species, which we characterized by UV/vis and Mössbauer spectroscopies, quantum mechanical calculations, and X-ray crystallography. Rate-limiting protonation of the ferrous amide to produce the corresponding amine is the final step in the catalytic cycle. These findings contribute to our understanding of the heme protein-catalyzed reduction of azides and provide a guide for future enzyme engineering campaigns to create more efficient nitrene transferases. Moreover, harnessing the reduction reaction in a chemoenzymatic cascade provided a potentially practical route to substituted pyrroles.
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Affiliation(s)
- Matthias Tinzl
- Laboratory
of Organic Chemistry, ETH Zürich, 8093 Zürich, Switzerland
| | - Johannes V. Diedrich
- Institute
of Physical and Theoretical Chemistry, TU
Braunschweig, 38106 Braunschweig, Germany
| | - Peer R. E. Mittl
- Department
of Biochemistry, University of Zürich, 8057 Zürich, Switzerland
| | - Martin Clémancey
- Université
Grenoble AlpesCNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des
Métaux, 17 Rue des Martyrs, Grenoble F-38054 Cedex, France
| | - Markus Reiher
- Institute
for Molecular Physical Science, ETH Zürich, 8093 Zürich, Switzerland
| | - Jonny Proppe
- Institute
of Physical and Theoretical Chemistry, TU
Braunschweig, 38106 Braunschweig, Germany
| | - Jean-Marc Latour
- Université
Grenoble AlpesCNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des
Métaux, 17 Rue des Martyrs, Grenoble F-38054 Cedex, France
| | - Donald Hilvert
- Laboratory
of Organic Chemistry, ETH Zürich, 8093 Zürich, Switzerland
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6
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Rekhtina M, Bugaev A, Dunstan MT, Dal Pozzo A, Nadjafi M, Borca C, Huthwelker T, Abdala PM, Müller CR. Probing the Local Structure of Na in NaNO 3-Promoted, MgO-Based CO 2 Sorbents via X-ray Absorption Spectroscopy. Chem Mater 2023; 35:10060-10069. [PMID: 38107192 PMCID: PMC10720340 DOI: 10.1021/acs.chemmater.3c02077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 11/15/2023] [Accepted: 11/15/2023] [Indexed: 12/19/2023]
Abstract
This work provides insight into the local structure of Na in MgO-based CO2 sorbents that are promoted with NaNO3. To this end, we use X-ray absorption spectroscopy (XAS) at the Na K-edge to interrogate the local structure of Na during the CO2 capture (MgO + CO2 ↔ MgCO3). The analysis of Na K-edge XAS data shows that the local environment of Na is altered upon MgO carbonation when compared to that of NaNO3 in the as-prepared sorbent. We attribute the changes observed in the carbonated sorbent to an alteration in the local structure of Na at the NaNO3/MgCO3 interfaces and/or in the vicinity of [Mg2+···CO32-] ionic pairs that are trapped in the cooled NaNO3 melt. The changes observed are reversible, i.e., the local environment of NaNO3 was restored after a regeneration treatment to decompose MgCO3 to MgO. The ex situ Na K-edge XAS experiments were complemented by ex situ magic-angle spinning 23Na nuclear magnetic resonance (MAS 23Na NMR), Mg K-edge XAS and X-ray powder diffraction (XRD). These additional experiments support our interpretation of the Na K-edge XAS data. Furthermore, we develop in situ Na (and Mg) K-edge XAS experiments during the carbonation of the sorbent (NaNO3 is molten under the conditions of the in situ experiments). These in situ Na K-edge XANES spectra of molten NaNO3 open new opportunities to investigate the atomic scale structure of CO2 sorbents modified with Na-based molten salts by using XAS.
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Affiliation(s)
- Margarita Rekhtina
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Aram Bugaev
- Paul
Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Matthew T. Dunstan
- Department
of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K.
| | - Alessandro Dal Pozzo
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
- Laboratory
of Industrial Safety and Environmental Sustainability, Department
of Civil, Chemical, Environmental and Materials Engineering, Alma
Mater, Studiorum—Università
di Bologna, Via Terracini
28, 40131 Bologna, Italy
| | - Manouchehr Nadjafi
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Camelia Borca
- Paul
Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Thomas Huthwelker
- Paul
Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
| | - Paula M. Abdala
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Christoph R. Müller
- Laboratory
of Energy Science and Engineering, Department of Mechanical and Process
Engineering, ETH Zürich, Leonhardstrasse 21, 8092 Zürich, Switzerland
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7
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Bezinge L, Tappauf N, Richards DA, Shih CJ, deMello AJ. Rapid Electrochemical Flow Analysis of Urinary Creatinine on Paper: Unleashing the Potential of Two-Electrode Detection. ACS Sens 2023; 8:3964-3972. [PMID: 37756250 PMCID: PMC10616850 DOI: 10.1021/acssensors.3c01640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023]
Abstract
The development of low-cost, disposable electrochemical sensors is an essential step in moving traditionally inaccessible quantitative diagnostic assays toward the point of need. However, a major remaining limitation of current technologies is the reliance on standardized reference electrode materials. Integrating these reference electrodes considerably restricts the choice of the electrode substrate and drastically increases the fabrication costs. Herein, we demonstrate that adoption of two-electrode detection systems can circumvent these limitations and allow for the development of low-cost, paper-based devices. We showcase the power of this approach by developing a continuous flow assay for urinary creatinine enabled by an embedded graphenic two-electrode detector. The detection system not only simplifies sensor fabrication and readout hardware but also provides a robust sensing performance with high detection efficiencies. In addition to enabling high-throughput analysis of clinical urine samples, our two-electrode sensors provide unprecedented insights into the fundamental mechanism of the ferricyanide-mediated creatinine reaction. Finally, we developed a simplified circuitry to drive the detector. This forms the basis of a smart reader that guides the user through the measurement process. This study showcases the potential of affordable capillary-driven cartridges for clinical analysis within primary care settings.
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Affiliation(s)
- Léonard Bezinge
- Institute for Chemical and
Bioengineering, Department of Chemistry
and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich, Switzerland
| | - Niklas Tappauf
- Institute for Chemical and
Bioengineering, Department of Chemistry
and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich, Switzerland
| | - Daniel A. Richards
- Institute for Chemical and
Bioengineering, Department of Chemistry
and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich, Switzerland
| | - Chih-Jen Shih
- Institute for Chemical and
Bioengineering, Department of Chemistry
and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich, Switzerland
| | - Andrew J. deMello
- Institute for Chemical and
Bioengineering, Department of Chemistry
and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zürich, Switzerland
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8
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K. Sivan A, Abad B, Albrigi T, Arif O, Trautvetter J, Ruiz Caridad A, Arya C, Zannier V, Sorba L, Rurali R, Zardo I. GaAs/GaP Superlattice Nanowires for Tailoring Phononic Properties at the Nanoscale: Implications for Thermal Engineering. ACS Appl Nano Mater 2023; 6:18602-18613. [PMID: 37854853 PMCID: PMC10580287 DOI: 10.1021/acsanm.3c04245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 09/21/2023] [Indexed: 10/20/2023]
Abstract
The possibility to tune the functional properties of nanomaterials is key to their technological applications. Superlattices, i.e., periodic repetitions of two or more materials in one or more dimensions, are being explored for their potential as materials with tailor-made properties. Meanwhile, nanowires offer a myriad of possibilities to engineer systems at the nanoscale, as well as to combine materials that cannot be put together in conventional heterostructures due to the lattice mismatch. In this work, we investigate GaAs/GaP superlattices embedded in GaP nanowires and demonstrate the tunability of their phononic and optoelectronic properties by inelastic light scattering experiments corroborated by ab initio calculations. We observe clear modifications in the dispersion relation for both acoustic and optical phonons in the superlattices nanowires. We find that by controlling the superlattice periodicity, we can achieve tunability of the phonon frequencies. We also performed wavelength-dependent Raman microscopy on GaAs/GaP superlattice nanowires, and our results indicate a reduction in the electronic bandgap in the superlattice compared to the bulk counterpart. All of our experimental results are rationalized with the help of ab initio density functional perturbation theory (DFPT) calculations. This work sheds fresh insights into how material engineering at the nanoscale can tailor phonon dispersion and open pathways for thermal engineering.
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Affiliation(s)
- Aswathi K. Sivan
- Department
of Physics, University of Basel, 4056 Basel, Switzerland
| | - Begoña Abad
- Department
of Physics, University of Basel, 4056 Basel, Switzerland
| | - Tommaso Albrigi
- Institut
de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Omer Arif
- NEST,
Istituto Nanoscienze-CNR and Scuola Normale Superiore, 56127 Pisa, Italy
| | | | | | - Chaitanya Arya
- Department
of Physics, University of Basel, 4056 Basel, Switzerland
| | - Valentina Zannier
- NEST,
Istituto Nanoscienze-CNR and Scuola Normale Superiore, 56127 Pisa, Italy
| | - Lucia Sorba
- NEST,
Istituto Nanoscienze-CNR and Scuola Normale Superiore, 56127 Pisa, Italy
| | - Riccardo Rurali
- Institut
de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Spain
| | - Ilaria Zardo
- Department
of Physics, University of Basel, 4056 Basel, Switzerland
- Swiss
Nanoscience Institute, University of Basel, 4056 Basel, Switzerland
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9
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Liu T, Parekh R, Mocny P, Bloom BP, Zhao Y, An SY, Pan B, Yin R, Waldeck DH, Whitacre JF, Matyjaszewski K. Tailored PVDF Graft Copolymers via ATRP as High-Performance NCM811 Cathode Binders. ACS Mater Lett 2023; 5:2594-2603. [PMID: 37800127 PMCID: PMC10548467 DOI: 10.1021/acsmaterialslett.3c00485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 07/31/2023] [Indexed: 10/07/2023]
Abstract
High-nickel layered oxides, e.g., LiNi0.8Co0.1Mn0.1O2 (NCM811), are promising candidates for cathode materials in high-energy-density lithium-ion batteries (LIBs). Complementing the notable developments of modification of active materials, this study focused on the polymer binder materials, and a new synthetic route was developed to engineer PVDF binders by covalently grafting copolymers from poly(vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) with multiple functionalities using atom transfer radical polymerization (ATRP). The grafted random copolymer binder provided excellent flexibility (319% elongation), adhesion strength (50 times higher than PVDF), transition metal chelation capability, and efficient ionic conductivity pathways. The NCM811 half-cells using the designed binders exhibited a remarkable rate capability of 143.4 mA h g-1 at 4C and cycling stability with 70.1% capacity retention after 230 cycles at 0.5 C, which is much higher than the 52.3% capacity retention of nonmodified PVDF. The well-retained structure of NCM811 with the designed binder was systematically studied and confirmed by post-mortem analysis.
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Affiliation(s)
- Tong Liu
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Ave, Pittsburgh, Pennsylvania 15213, United States
| | - Rohan Parekh
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Ave, Pittsburgh, Pennsylvania 15213, United States
- Department
of Materials Science and Engineering, Carnegie
Mellon University, 5000 Forbes Ave, Pittsburgh, Pennsylvania 15213, United States
| | - Piotr Mocny
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Ave, Pittsburgh, Pennsylvania 15213, United States
| | - Brian P. Bloom
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Yuqi Zhao
- Department
of Materials Science and Engineering, Carnegie
Mellon University, 5000 Forbes Ave, Pittsburgh, Pennsylvania 15213, United States
| | - So Young An
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Ave, Pittsburgh, Pennsylvania 15213, United States
| | - Bonian Pan
- Department
of Materials Science and Engineering, Carnegie
Mellon University, 5000 Forbes Ave, Pittsburgh, Pennsylvania 15213, United States
| | - Rongguan Yin
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Ave, Pittsburgh, Pennsylvania 15213, United States
| | - David H. Waldeck
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Jay F. Whitacre
- Department
of Materials Science and Engineering, Carnegie
Mellon University, 5000 Forbes Ave, Pittsburgh, Pennsylvania 15213, United States
- Scott
Institute for Energy Innovation, Carnegie
Mellon University, 5000 Forbes Ave, Pittsburgh, Pennsylvania 15213, United States
| | - Krzysztof Matyjaszewski
- Department
of Chemistry, Carnegie Mellon University, 4400 Fifth Ave, Pittsburgh, Pennsylvania 15213, United States
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10
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Tournier B, Bouteldja F, Amossé Q, Nicolaides A, Duarte Azevedo M, Tenenbaum L, Garibotto V, Ceyzériat K, Millet P. 18 kDa Translocator Protein TSPO Is a Mediator of Astrocyte Reactivity. ACS Omega 2023; 8:31225-31236. [PMID: 37663488 PMCID: PMC10468775 DOI: 10.1021/acsomega.3c03368] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 08/01/2023] [Indexed: 09/05/2023]
Abstract
An increase in astrocyte reactivity has been described in Alzheimer's disease and seems to be related to the presence of a pro-inflammatory environment. Reactive astrocytes show an increase in the density of the 18 kDa translocator protein (TSPO), but TSPO involvement in astrocyte functions remains poorly understood. The goal of this study was to better characterize the mechanisms leading to the increase in TSPO under inflammatory conditions and the associated consequences. For this purpose, the C6 astrocytic cell line was used in the presence of lipopolysaccharide (LPS) or TSPO overexpression mediated by the transfection of a plasmid encoding TSPO. The results show that nonlethal doses of LPS induced TSPO expression at mRNA and protein levels through a STAT3-dependent mechanism and increased the number of mitochondria per cell. LPS stimulated reactive oxygen species (ROS) production and decreased glucose consumption (quantified by the [18F]FDG uptake), and these effects were diminished by FEPPA, a TSPO antagonist. The transfection-mediated overexpression of TSPO induced ROS production, and this effect was blocked by FEPPA. In addition, a synergistic effect of overexpression of TSPO and LPS on ROS production was observed. These data show that the increase of TSPO in astrocytic cells is involved in the regulation of glucose metabolism and in the pro-inflammatory response. These data suggest that the overexpression of TSPO by astrocytes in Alzheimer's disease would have rather deleterious effects by promoting the pro-inflammatory response.
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Affiliation(s)
- Benjamin
B. Tournier
- Department
of Psychiatry, University Hospitals of Geneva, Geneva 1206, Switzerland
- Department
of Psychiatry, University of Geneva, Geneva 1211, Switzerland
| | - Farha Bouteldja
- Department
of Psychiatry, University of Geneva, Geneva 1211, Switzerland
| | - Quentin Amossé
- Department
of Psychiatry, University of Geneva, Geneva 1211, Switzerland
| | - Alekos Nicolaides
- Department
of Psychiatry, University of Geneva, Geneva 1211, Switzerland
| | - Marcelo Duarte Azevedo
- Laboratory
of Cellular and Molecular Neurotherapies, Center for Neuroscience
Research, Clinical Neuroscience Department, Lausanne University Hospital, Lausanne 1011, Switzerland
| | - Liliane Tenenbaum
- Laboratory
of Cellular and Molecular Neurotherapies, Center for Neuroscience
Research, Clinical Neuroscience Department, Lausanne University Hospital, Lausanne 1011, Switzerland
| | - Valentina Garibotto
- Division
of Nuclear Medicine, Diagnostic Department, University Hospitals of Geneva, Geneva 1206, Switzerland
- CIBM
Center for BioMedical Imaging; NIMTLab, Faculty of Medicine, University of Geneva, Geneva 1211, Switzerland
| | - Kelly Ceyzériat
- Department
of Psychiatry, University Hospitals of Geneva, Geneva 1206, Switzerland
- Department
of Psychiatry, University of Geneva, Geneva 1211, Switzerland
- Division
of Nuclear Medicine, Diagnostic Department, University Hospitals of Geneva, Geneva 1206, Switzerland
- CIBM
Center for BioMedical Imaging; NIMTLab, Faculty of Medicine, University of Geneva, Geneva 1211, Switzerland
| | - Philippe Millet
- Department
of Psychiatry, University Hospitals of Geneva, Geneva 1206, Switzerland
- Department
of Psychiatry, University of Geneva, Geneva 1211, Switzerland
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11
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Jiang Y, Mingard C, Huber SM, Takhaveev V, McKeague M, Kizaki S, Schneider M, Ziegler N, Hürlimann V, Hoeng J, Sierro N, Ivanov NV, Sturla SJ. Quantification and Mapping of Alkylation in the Human Genome Reveal Single Nucleotide Resolution Precursors of Mutational Signatures. ACS Cent Sci 2023; 9:362-372. [PMID: 36968528 PMCID: PMC10037492 DOI: 10.1021/acscentsci.2c01100] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Indexed: 06/18/2023]
Abstract
Chemical modifications to DNA bases, including DNA adducts arising from reactions with electrophilic chemicals, are well-known to impact cell growth, miscode during replication, and influence disease etiology. However, knowledge of how genomic sequences and structures influence the accumulation of alkylated DNA bases is not broadly characterized with high resolution, nor have these patterns been linked with overall quantities of modified bases in the genome. For benzo(a) pyrene (BaP), a ubiquitous environmental carcinogen, we developed a single-nucleotide resolution damage sequencing method to map in a human lung cell line the main mutagenic adduct arising from BaP. Furthermore, we combined this analysis with quantitative mass spectrometry to evaluate the dose-response profile of adduct formation. By comparing damage abundance with DNase hypersensitive sites, transcription levels, and other genome annotation data, we found that although overall adduct levels rose with increasing chemical exposure concentration, genomic distribution patterns consistently correlated with chromatin state and transcriptional status. Moreover, due to the single nucleotide resolution characteristics of this DNA damage map, we could determine preferred DNA triad sequence contexts for alkylation accumulation, revealing a characteristic DNA damage signature. This new BaP damage signature had a profile highly similar to mutational signatures identified previously in lung cancer genomes from smokers. Thus, these data provide insight on how genomic features shape the accumulation of alkylation products in the genome and predictive strategies for linking single-nucleotide resolution in vitro damage maps with human cancer mutations.
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Affiliation(s)
- Yang Jiang
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Cécile Mingard
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Sabrina M. Huber
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Vakil Takhaveev
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Maureen McKeague
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
- Pharmacology
and Therapeutics, Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
| | - Seiichiro Kizaki
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Mirjam Schneider
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Nathalie Ziegler
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Vera Hürlimann
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
| | - Julia Hoeng
- Philip
Morris Products SA, Quai
Jeanrenaud 3, Neuchatel 2000, Switzerland
| | - Nicolas Sierro
- Philip
Morris Products SA, Quai
Jeanrenaud 3, Neuchatel 2000, Switzerland
| | - Nikolai V. Ivanov
- Philip
Morris Products SA, Quai
Jeanrenaud 3, Neuchatel 2000, Switzerland
| | - Shana J. Sturla
- Department
of Health Sciences and Technology, ETH Zurich, Schmelzbergstrasse 9, Zurich 8092, Switzerland
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12
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Boehme S, Bodnarchuk MI, Burian M, Bertolotti F, Cherniukh I, Bernasconi C, Zhu C, Erni R, Amenitsch H, Naumenko D, Andrusiv H, Semkiv N, John RA, Baldwin A, Galkowski K, Masciocchi N, Stranks SD, Rainò G, Guagliardi A, Kovalenko MV. Strongly Confined CsPbBr 3 Quantum Dots as Quantum Emitters and Building Blocks for Rhombic Superlattices. ACS Nano 2023; 17:2089-2100. [PMID: 36719353 PMCID: PMC9933619 DOI: 10.1021/acsnano.2c07677] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 01/05/2023] [Indexed: 06/18/2023]
Abstract
The success of the colloidal semiconductor quantum dots (QDs) field is rooted in the precise synthetic control of QD size, shape, and composition, enabling electronically well-defined functional nanomaterials that foster fundamental science and motivate diverse fields of applications. While the exploitation of the strong confinement regime has been driving commercial and scientific interest in InP or CdSe QDs, such a regime has still not been thoroughly explored and exploited for lead-halide perovskite QDs, mainly due to a so far insufficient chemical stability and size monodispersity of perovskite QDs smaller than about 7 nm. Here, we demonstrate chemically stable strongly confined 5 nm CsPbBr3 colloidal QDs via a postsynthetic treatment employing didodecyldimethylammonium bromide ligands. The achieved high size monodispersity (7.5% ± 2.0%) and shape-uniformity enables the self-assembly of QD superlattices with exceptional long-range order, uniform thickness, an unusual rhombic packing with an obtuse angle of 104°, and narrow-band cyan emission. The enhanced chemical stability indicates the promise of strongly confined perovskite QDs for solution-processed single-photon sources, with single QDs showcasing a high single-photon purity of 73% and minimal blinking (78% "on" fraction), both at room temperature.
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Affiliation(s)
- Simon
C. Boehme
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Maryna I. Bodnarchuk
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Max Burian
- Swiss
Light Source, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Federica Bertolotti
- Department
of Science and High Technology and To.Sca.Lab., University of Insubria, via Valleggio 11, 22100 Como, Italy
| | - Ihor Cherniukh
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Caterina Bernasconi
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Chenglian Zhu
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Rolf Erni
- Electron
Microscopy Center, Empa, Swiss
Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Heinz Amenitsch
- Institute
of Inorganic Chemistry, Graz University
of Technology, 8010 Graz, Austria
| | - Denys Naumenko
- Institute
of Inorganic Chemistry, Graz University
of Technology, 8010 Graz, Austria
| | - Hordii Andrusiv
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Nazar Semkiv
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Rohit Abraham John
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Alan Baldwin
- Cavendish
Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
- Department
of Chemical Engineering & Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
| | - Krzysztof Galkowski
- Cavendish
Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
| | - Norberto Masciocchi
- Department
of Science and High Technology and To.Sca.Lab., University of Insubria, via Valleggio 11, 22100 Como, Italy
| | - Samuel D. Stranks
- Cavendish
Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.
- Department
of Chemical Engineering & Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, U.K.
| | - Gabriele Rainò
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
| | - Antonietta Guagliardi
- Istituto
di Cristallografia and To.Sca.Lab, Consiglio
Nazionale delle Ricerche, via Valleggio 11, 22100 Como, Italy
| | - Maksym V. Kovalenko
- Institute
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
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13
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Surdu M, Lamkaddam H, Wang DS, Bell DM, Xiao M, Lee CP, Li D, Caudillo L, Marie G, Scholz W, Wang M, Lopez B, Piedehierro AA, Ataei F, Baalbaki R, Bertozzi B, Bogert P, Brasseur Z, Dada L, Duplissy J, Finkenzeller H, He XC, Höhler K, Korhonen K, Krechmer JE, Lehtipalo K, Mahfouz NGA, Manninen HE, Marten R, Massabò D, Mauldin R, Petäjä T, Pfeifer J, Philippov M, Rörup B, Simon M, Shen J, Umo NS, Vogel F, Weber SK, Zauner-Wieczorek M, Volkamer R, Saathoff H, Möhler O, Kirkby J, Worsnop DR, Kulmala M, Stratmann F, Hansel A, Curtius J, Welti A, Riva M, Donahue NM, Baltensperger U, El Haddad I. Molecular Understanding of the Enhancement in Organic Aerosol Mass at High Relative Humidity. Environ Sci Technol 2023; 57:2297-2309. [PMID: 36716278 PMCID: PMC9933880 DOI: 10.1021/acs.est.2c04587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 10/11/2022] [Accepted: 11/21/2022] [Indexed: 06/18/2023]
Abstract
The mechanistic pathway by which high relative humidity (RH) affects gas-particle partitioning remains poorly understood, although many studies report increased secondary organic aerosol (SOA) yields at high RH. Here, we use real-time, molecular measurements of both the gas and particle phase to provide a mechanistic understanding of the effect of RH on the partitioning of biogenic oxidized organic molecules (from α-pinene and isoprene) at low temperatures (243 and 263 K) at the CLOUD chamber at CERN. We observe increases in SOA mass of 45 and 85% with increasing RH from 10-20 to 60-80% at 243 and 263 K, respectively, and attribute it to the increased partitioning of semi-volatile compounds. At 263 K, we measure an increase of a factor 2-4 in the concentration of C10H16O2-3, while the particle-phase concentrations of low-volatility species, such as C10H16O6-8, remain almost constant. This results in a substantial shift in the chemical composition and volatility distribution toward less oxygenated and more volatile species at higher RH (e.g., at 263 K, O/C ratio = 0.55 and 0.40, at RH = 10 and 80%, respectively). By modeling particle growth using an aerosol growth model, which accounts for kinetic limitations, we can explain the enhancement in the semi-volatile fraction through the complementary effect of decreased compound activity and increased bulk-phase diffusivity. Our results highlight the importance of particle water content as a diluting agent and a plasticizer for organic aerosol growth.
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Affiliation(s)
- Mihnea Surdu
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Houssni Lamkaddam
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Dongyu S. Wang
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - David M. Bell
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Mao Xiao
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Chuan Ping Lee
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Dandan Li
- Université
de Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 69626 Villeurbanne, France
| | - Lucía Caudillo
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
| | - Guillaume Marie
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
| | - Wiebke Scholz
- Institute
for Ion and Applied Physics, University
of Innsbruck, 6020 Innsbruck, Austria
| | - Mingyi Wang
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, 91125 California, United States
- Center for
Atmospheric Particle Studies, Carnegie Mellon
University, 5000 Forbes Avenue, Pittsburgh, 15213 Pennsylvania, United States
| | - Brandon Lopez
- Center for
Atmospheric Particle Studies, Carnegie Mellon
University, 5000 Forbes Avenue, Pittsburgh, 15213 Pennsylvania, United States
| | | | - Farnoush Ataei
- Department
of Experimental Aerosol and Cloud Microphysics, Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany
| | - Rima Baalbaki
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
| | - Barbara Bertozzi
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, 76021 Karlsruhe, Germany
| | - Pia Bogert
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, 76021 Karlsruhe, Germany
| | - Zoé Brasseur
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
| | - Lubna Dada
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Jonathan Duplissy
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
- Helsinki Institute of Physics, University
of Helsinki, 00014 Helsinki, Finland
| | - Henning Finkenzeller
- Department
of Chemistry & CIRES, University
of Colorado Boulder, UCB 215, Boulder, 80309-0215 Colorado, United States
| | - Xu-Cheng He
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
| | - Kristina Höhler
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, 76021 Karlsruhe, Germany
| | - Kimmo Korhonen
- Department of Applied Physics, University
of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland
| | | | - Katrianne Lehtipalo
- Finnish
Meteorological Institute, 00560 Helsinki, Finland
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
| | - Naser G. A. Mahfouz
- Atmospheric and Oceanic Sciences, Princeton
University, Princeton, 08540 New Jersey, United States
| | - Hanna E. Manninen
- CERN,
the European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - Ruby Marten
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Dario Massabò
- Department of Physics, University of Genoa
& INFN, 16146 Genoa, Italy
| | - Roy Mauldin
- Department
of Chemistry, Carnegie Mellon
University, 4400 Fifth
Avenue, Pittsburgh, 15213 Pennsylvania, United States
- Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, UCB 311, Boulder, 80309 Colorado, United
States
| | - Tuukka Petäjä
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
| | - Joschka Pfeifer
- CERN,
the European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - Maxim Philippov
- P. N. Lebedev Physical Institute of the
Russian Academy of Sciences, 119991 Moscow, Russia
| | - Birte Rörup
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
| | - Mario Simon
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
| | - Jiali Shen
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
| | - Nsikanabasi Silas Umo
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, 76021 Karlsruhe, Germany
| | - Franziska Vogel
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, 76021 Karlsruhe, Germany
| | - Stefan K. Weber
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
- CERN,
the European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - Marcel Zauner-Wieczorek
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
| | - Rainer Volkamer
- Department
of Chemistry & CIRES, University
of Colorado Boulder, UCB 215, Boulder, 80309-0215 Colorado, United States
| | - Harald Saathoff
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, 76021 Karlsruhe, Germany
| | - Ottmar Möhler
- Institute
of Meteorology and Climate Research, Karlsruhe
Institute of Technology, 76021 Karlsruhe, Germany
| | - Jasper Kirkby
- CERN,
the European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland
| | - Douglas R. Worsnop
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
- Aerodyne Research, Inc., Billerica, 01821 Massachusetts, United States
| | - Markku Kulmala
- Institute
for Atmospheric and Earth System Research (INAR)/Physics, Faculty
of Science, University of Helsinki, 00014 Helsinki, Finland
| | - Frank Stratmann
- Department
of Experimental Aerosol and Cloud Microphysics, Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany
| | - Armin Hansel
- Institute
for Ion and Applied Physics, University
of Innsbruck, 6020 Innsbruck, Austria
| | - Joachim Curtius
- Institute
for Atmospheric and Environmental Sciences, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
| | - André Welti
- Finnish
Meteorological Institute, 00560 Helsinki, Finland
| | - Matthieu Riva
- Université
de Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 69626 Villeurbanne, France
- Tofwerk AG, CH-3600 Thun, Switzerland
| | - Neil M. Donahue
- Center for
Atmospheric Particle Studies, Carnegie Mellon
University, 5000 Forbes Avenue, Pittsburgh, 15213 Pennsylvania, United States
| | - Urs Baltensperger
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Imad El Haddad
- Laboratory
of Atmospheric Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
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14
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Scherb S, Hinaut A, Yao X, Götz A, Al-Hilfi SH, Wang XY, Hu Y, Qiu Z, Song Y, Müllen K, Glatzel T, Narita A, Meyer E. Solution-Synthesized Extended Graphene Nanoribbons Deposited by High-Vacuum Electrospray Deposition. ACS Nano 2023; 17:597-605. [PMID: 36542550 PMCID: PMC9835822 DOI: 10.1021/acsnano.2c09748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
Solution-synthesized graphene nanoribbons (GNRs) facilitate various interesting structures and functionalities, like nonplanarity and thermolabile functional groups, that are not or not easily accessible by on-surface synthesis. Here, we show the successful high-vacuum electrospray deposition (HVESD) of well-elongated solution-synthesized GNRs on surfaces maintained in ultrahigh vacuum. We compare three distinct GNRs, a twisted nonplanar fjord-edged GNR, a methoxy-functionalized "cove"-type (or also called gulf) GNR, and a longer "cove"-type GNR both equipped with alkyl chains on Au(111). Nc-AFM measurements at room temperature with submolecular imaging combined with Raman spectroscopy allow us to characterize individual GNRs and confirm their chemical integrity. The fjord-GNR and methoxy-GNR are additionally deposited on nonmetallic HOPG and SiO2, and fjord-GNR is deposited on a KBr(001) surface, facilitating the study of GNRs on substrates, as of now not accessible by on-surface synthesis.
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Affiliation(s)
- Sebastian Scherb
- Department
of Physics, University of Basel, Klingelbergstrasse 82, 4056, Basel, Switzerland
| | - Antoine Hinaut
- Department
of Physics, University of Basel, Klingelbergstrasse 82, 4056, Basel, Switzerland
| | - Xuelin Yao
- Max
Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Alicia Götz
- Max
Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Department
of Chemistry, Johannes Gutenberg University
Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Samir H. Al-Hilfi
- Max
Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Xiao-Ye Wang
- Max
Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Yunbin Hu
- Max
Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Zijie Qiu
- Max
Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Yiming Song
- Department
of Physics, University of Basel, Klingelbergstrasse 82, 4056, Basel, Switzerland
| | - Klaus Müllen
- Max
Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
- Department
of Chemistry, Johannes Gutenberg University
Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Thilo Glatzel
- Department
of Physics, University of Basel, Klingelbergstrasse 82, 4056, Basel, Switzerland
| | - Akimitsu Narita
- Max
Plank Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Ernst Meyer
- Department
of Physics, University of Basel, Klingelbergstrasse 82, 4056, Basel, Switzerland
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15
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Negri V, Charalambous MA, Medrano-García JD, Guillén-Gosálbez G. Navigating within the Safe Operating Space with Carbon Capture On-Board. ACS Sustain Chem Eng 2022; 10:17134-17142. [PMID: 36591544 PMCID: PMC9795543 DOI: 10.1021/acssuschemeng.2c04627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 11/26/2022] [Indexed: 06/17/2023]
Abstract
Despite the global pandemic that recently affected human and cargo transportation, the emissions of the maritime sector are projected to keep growing steadily. The International Maritime Organization focused on boosting the fleets' efficiency to improve their environmental performance, while more sustainable fuels are currently under investigation. Here, we assess the economic, technical, and environmental feasibility of an interim solution for low-carbon shipping using state-of-the-art CO2 capture technology, namely, chemical absorption, on-board cargo ships. We compute the carbon footprint of this alternative and perform an absolute sustainability study based on seven planetary boundaries. Our results show that the capture on-board scenario can achieve 94% efficiency on the net CO2 emissions at 85 $/tCO2 while substantially reducing impacts on core planetary boundaries (relative to the business as usual) and outperforming a direct air capture scenario in global warming and all planetary boundaries, except for the nitrogen flow. Hence, capture on-board seems an appealing solution to decarbonize shipping in the short term while alternative carbon-free fuels and related infrastructure are developed and deployed.
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16
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Bedendi G, De Moura Torquato LD, Webb S, Cadoux C, Kulkarni A, Sahin S, Maroni P, Milton RD, Grattieri M. Enzymatic and Microbial Electrochemistry: Approaches and Methods. ACS Meas Sci Au 2022; 2:517-541. [PMID: 36573075 PMCID: PMC9783092 DOI: 10.1021/acsmeasuresciau.2c00042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 08/12/2022] [Accepted: 08/15/2022] [Indexed: 06/17/2023]
Abstract
The coupling of enzymes and/or intact bacteria with electrodes has been vastly investigated due to the wide range of existing applications. These span from biomedical and biosensing to energy production purposes and bioelectrosynthesis, whether for theoretical research or pure applied industrial processes. Both enzymes and bacteria offer a potential biotechnological alternative to noble/rare metal-dependent catalytic processes. However, when developing these biohybrid electrochemical systems, it is of the utmost importance to investigate how the approaches utilized to couple biocatalysts and electrodes influence the resulting bioelectrocatalytic response. Accordingly, this tutorial review starts by recalling some basic principles and applications of bioelectrochemistry, presenting the electrode and/or biocatalyst modifications that facilitate the interaction between the biotic and abiotic components of bioelectrochemical systems. Focus is then directed toward the methods used to evaluate the effectiveness of enzyme/bacteria-electrode interaction and the insights that they provide. The basic concepts of electrochemical methods widely employed in enzymatic and microbial electrochemistry, such as amperometry and voltammetry, are initially presented to later focus on various complementary methods such as spectroelectrochemistry, fluorescence spectroscopy and microscopy, and surface analytical/characterization techniques such as quartz crystal microbalance and atomic force microscopy. The tutorial review is thus aimed at students and graduate students approaching the field of enzymatic and microbial electrochemistry, while also providing a critical and up-to-date reference for senior researchers working in the field.
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Affiliation(s)
- Giada Bedendi
- Department
of Inorganic and Analytical Chemistry, Faculty of Sciences, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | | | - Sophie Webb
- Department
of Inorganic and Analytical Chemistry, Faculty of Sciences, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
- National
Centre of Competence in Research (NCCR) Catalysis, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | - Cécile Cadoux
- Department
of Inorganic and Analytical Chemistry, Faculty of Sciences, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
- National
Centre of Competence in Research (NCCR) Catalysis, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | - Amogh Kulkarni
- Department
of Inorganic and Analytical Chemistry, Faculty of Sciences, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | - Selmihan Sahin
- Department
of Inorganic and Analytical Chemistry, Faculty of Sciences, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | - Plinio Maroni
- Department
of Inorganic and Analytical Chemistry, Faculty of Sciences, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | - Ross D. Milton
- Department
of Inorganic and Analytical Chemistry, Faculty of Sciences, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
- National
Centre of Competence in Research (NCCR) Catalysis, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | - Matteo Grattieri
- Dipartimento
di Chimica, Università degli Studi
di Bari “Aldo Moro”, via E. Orabona 4, Bari 70125, Italy
- IPCF-CNR
Istituto per i Processi Chimico Fisici, Consiglio Nazionale delle Ricerche, via E. Orabona 4, Bari 70125, Italy
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17
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Bryan L, Awasthi S, Li Y, Nirmalraj PN, Balog S, Yang J, Mayer M. Site-Specific C-Terminal Fluorescent Labeling of Tau Protein. ACS Omega 2022; 7:47009-47014. [PMID: 36570287 PMCID: PMC9773802 DOI: 10.1021/acsomega.2c06139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 11/30/2022] [Indexed: 05/29/2023]
Abstract
Formation of Tau protein aggregates in neurons is a pathological hallmark of several neurodegenerative diseases, including Alzheimer's disease. Fluorescently labeled Tau protein is therefore useful to study the aggregation of these pathological proteins and to identify potential therapeutic targets. Conventionally, cysteine residues are used for labeling Tau proteins; however, the full-length Tau isoform contains two cysteine residues in the microtubule-binding region, which are implicated in Tau aggregation by forming intermolecular disulfide bonds. To prevent the fluorescent label from disturbing the microtubule binding region, we developed a strategy to fluorescently label Tau at its C-terminus while leaving cysteine residues unperturbed. We took advantage of a Sortase A-mediated transpeptidation approach to bind a short peptide (GGGH6-Alexa647) with a His-tag and a covalently attached Alexa 647 fluorophore to the C-terminus of Tau. This reaction relies on the presence of a Sortase recognition motif (LPXTG), which we attached to the C-terminus of recombinantly expressed Tau. We demonstrate that C-terminal modification of Tau protein results in no significant differences between the native and C-terminally labeled Tau monomer with regard to aggregation kinetics, secondary structure, and fibril morphology.
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Affiliation(s)
- Louise Bryan
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700Fribourg, Switzerland
| | - Saurabh Awasthi
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700Fribourg, Switzerland
| | - Yuanjie Li
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700Fribourg, Switzerland
| | - Peter Niraj Nirmalraj
- Transport
at Nanoscale Interfaces Laboratory, Swiss Federal Laboratories for
Materials Science and Technology, DübendorfCH-8600, Switzerland
| | - Sandor Balog
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700Fribourg, Switzerland
| | - Jerry Yang
- Department
of Chemistry and Biochemistry, University
of California San Diego, La Jolla, California92093-0358United States
| | - Michael Mayer
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700Fribourg, Switzerland
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18
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Bellini V, Rusponi S, Kolorenč J, Mahatha SK, Valbuena MA, Persichetti L, Pivetta M, Sorokin BV, Merk D, Reynaud S, Sblendorio D, Stepanow S, Nistor C, Gargiani P, Betto D, Mugarza A, Gambardella P, Brune H, Carbone C, Barla A. Slow Magnetic Relaxation of Dy Adatoms with In-Plane Magnetic Anisotropy on a Two-Dimensional Electron Gas. ACS Nano 2022; 16:11182-11193. [PMID: 35770912 PMCID: PMC9330770 DOI: 10.1021/acsnano.2c04048] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We report on the magnetic properties of Dy atoms adsorbed on the (001) surface of SrTiO3. X-ray magnetic circular dichroism reveals slow relaxation of the Dy magnetization on a time scale of about 800 s at 2.5 K, unusually associated with an easy-plane magnetic anisotropy. We attribute these properties to Dy atoms occupying hollow adsorption sites on the TiO2-terminated surface. Conversely, Ho atoms adsorbed on the same surface show paramagnetic behavior down to 2.5 K. With the help of atomic multiplet simulations and first-principles calculations, we establish that Dy populates also the top-O and bridge sites on the coexisting SrO-terminated surface. A simple magnetization relaxation model predicts these two sites to have an even longer magnetization lifetime than the hollow site. Moreover, the adsorption of Dy on the insulating SrTiO3 crystal leads, regardless of the surface termination, to the formation of a spin-polarized two-dimensional electron gas of Ti 3dxy character, together with an antiferromagnetic Dy-Ti coupling. Our findings support the feasibility of tuning the magnetic properties of the rare-earth atoms by acting on the substrate electronic gas with electric fields.
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Affiliation(s)
- Valerio Bellini
- S3-Istituto
di Nanoscienze-CNR, Via
Campi 213/A, I-41125 Modena, Italy
| | - Stefano Rusponi
- Institute
of Physics, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Jindřich Kolorenč
- Institute
of Physics (FZU), Czech Academy of Sciences, Na Slovance 2, CZ-182
21 Prague, Czech Republic
| | - Sanjoy K. Mahatha
- Istituto
di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche
(CNR), I-34149 Trieste, Italy
- School
of
Physics and Materials Science, Thapar Institute
of Engineering and Technology, Patiala 147004, India
| | - Miguel Angel Valbuena
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST,
Campus UAB, Bellaterra, E-08193 Barcelona, Spain
- Instituto
Madrileño de Estudios Avanzados en Nanociencia (IMDEA Nanoscience), E-28049 Madrid, Spain
| | - Luca Persichetti
- Department
of Materials, ETH Zurich, CH-8093 Zurich, Switzerland
- Dipartimento
di Fisica, Università di Roma “Tor
Vergata”, I-00133 Roma, Italy
| | - Marina Pivetta
- Institute
of Physics, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Boris V. Sorokin
- Institute
of Physics, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Darius Merk
- Institute
of Physics, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Sébastien Reynaud
- Institute
of Physics, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Dante Sblendorio
- Institute
of Physics, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | | | - Corneliu Nistor
- Department
of Materials, ETH Zurich, CH-8093 Zurich, Switzerland
| | | | - Davide Betto
- European
Synchrotron Radiation Facility, F-38043 Grenoble Cedex, France
| | - Aitor Mugarza
- Catalan
Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST,
Campus UAB, Bellaterra, E-08193 Barcelona, Spain
- Institució
Catalana de Recerca i Estudis Avançats (ICREA), Barcelona E-08010, Spain
| | | | - Harald Brune
- Institute
of Physics, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Station 3, CH-1015 Lausanne, Switzerland
| | - Carlo Carbone
- Istituto
di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche
(CNR), I-34149 Trieste, Italy
| | - Alessandro Barla
- Istituto
di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche
(CNR), I-34149 Trieste, Italy
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19
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Escobar Steinvall S, Stutz EZ, Paul R, Zamani M, Leran JB, Dimitrievska M, Fontcuberta i Morral A. Nanoscale Growth Initiation as a Pathway to Improve the Earth-Abundant Absorber Zinc Phosphide. ACS Appl Energy Mater 2022; 5:5298-5306. [PMID: 35647493 PMCID: PMC9131307 DOI: 10.1021/acsaem.1c02484] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 09/28/2021] [Indexed: 05/15/2023]
Abstract
Growth approaches that limit the interface area between layers to nanoscale regions are emerging as a promising pathway to limit the interface defect formation due to mismatching lattice parameters or thermal expansion coefficient. Interfacial defect mitigation is of great interest in photovoltaics as it opens up more material combinations for use in devices. Herein, an overview of the vapor-liquid-solid and selective area epitaxy growth approaches applied to zinc phosphide (Zn3P2), an earth-abundant absorber material, is presented. First, we show how different morphologies, including nanowires, nanopyramids, and thin films, can be achieved by tuning the growth conditions and growth mechanisms. The growth conditions are also shown to greatly impact the defect structure and composition of the grown material, which can vary considerably from the ideal stoichiometry (Zn3P2). Finally, the functional properties are characterized. The direct band gap could accurately be determined at 1.50 ± 0.1 eV, and through complementary density functional theory calculations, we can identify a range of higher-order band gap transitions observed through valence electron energy loss spectroscopy and cathodoluminescence. Furthermore, we outline the formation of rotated domains inside of the material, which are a potential origin of defect transitions that have been long observed in zinc phosphide but not yet explained. The basic understanding provided reinvigorates the potential use of earth-abundant II-V semiconductors in photovoltaic technology. Moreover, the transferrable nanoscale growth approaches have the potential to be applied to other material systems, as they mitigate the constraints of substrate-material combinations causing interface defects.
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Affiliation(s)
- Simon Escobar Steinvall
- Laboratory
of Semiconductor Materials, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
- Center
for Analysis and Synthesis and NanoLund, Lund University, Box 124, 221 00 Lund, Sweden
- (S.E.S.)
| | - Elias Z. Stutz
- Laboratory
of Semiconductor Materials, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Rajrupa Paul
- Laboratory
of Semiconductor Materials, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Mahdi Zamani
- Laboratory
of Semiconductor Materials, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Jean-Baptiste Leran
- Laboratory
of Semiconductor Materials, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Mirjana Dimitrievska
- Laboratory
of Semiconductor Materials, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Anna Fontcuberta i Morral
- Laboratory
of Semiconductor Materials, Institute of Materials, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
- Institute
of Physics, Ecole Polytechnique Fédérale
de Lausanne, 1015 Lausanne, Switzerland
- (A.F.M.)
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20
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Bazylińska U, Wawrzyńczyk D, Kulbacka J, Picci G, Manni LS, Handschin S, Fornasier M, Caltagirone C, Mezzenga R, Murgia S. Hybrid Theranostic Cubosomes for Efficient NIR-Induced Photodynamic Therapy. ACS Nano 2022; 16:5427-5438. [PMID: 35333516 PMCID: PMC9047672 DOI: 10.1021/acsnano.1c09367] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 03/21/2022] [Indexed: 05/29/2023]
Abstract
In recent years, lipid bicontinuous cubic liquid-crystalline nanoparticles known as cubosomes have been under investigation because of their favorable properties as drug nanocarriers useful for anticancer treatments. Herein, we present organic/inorganic hybrid, theranostic cubosomes stabilized in water with a shell of alternate layers of chitosan, single strand DNA (model genetic material for potential gene therapy), and folic acid-chitosan conjugate (the outmost layer), coencapsulating up-converting Er3+ and Yb3+ codoped NaYF4 nanoparticles and daunorubicin. The latter acts as a chemotherapeutic drug of photosensitizing activity, while up-converting nanoparticles serve as energy harvester and diagnostic agent. Cellular uptake and NIR-induced photodynamic therapy were evaluated in vitro against human skin melanoma (MeWo) and ovarian (SKOV-3) cancer cells. Results evidenced the preferential uptake of the theranostic cubosomes in SKOV-3 cells in comparison to uptake in MeWo cells, and this effect was enhanced by the folic acid functionalization of the cubosomes surface. Nanocarriers coloaded with the hybrid fluorophores exhibited a superior NIR-induced photodynamic activity, also confirmed by the improved mitochondrial activity and the most affecting f-actin fibers of cytoskeleton. Similar results, but with higher photocytotoxicity, were detected when folic acid-functionalized cubosomes were incubated with SKOV-3 cells. Taken on the whole, these results prove these hybrid cubosomes are good candidates for the photodynamic treatment of tumor lesions.
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Affiliation(s)
- Urszula Bazylińska
- Department
of Physical and Quantum Chemistry, Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
| | - Dominika Wawrzyńczyk
- Advanced
Materials Engineering and Modelling Group, Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
| | - Julita Kulbacka
- Department
of Molecular and Cellular Biology, Faculty of Pharmacy, Wroclaw Medical University, Borowska 211 A, 50-556 Wroclaw, Poland
| | - Giacomo Picci
- Department
of Chemical and Geological Sciences, University
of Cagliari and CSGI, s.s. 554 bivio Sestu, I-09042 Monserrato, CA, Italy
| | - Livia Salvati Manni
- School
of Medical Sciences, School of Chemistry and University of Sydney
Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
- ETH
Zurich Department of Health Sciences & Technology, Schmelzbergstrasse 9, Zurich 8093, Switzerland
| | - Stephan Handschin
- ETH
Zurich Scientific Center for Optical and Electron Microscopy (ScopeM), Otto-Stern-Weg 3, Zurich 8093, Switzerland
| | - Marco Fornasier
- Department
of Chemical and Geological Sciences, University
of Cagliari and CSGI, s.s. 554 bivio Sestu, I-09042 Monserrato, CA, Italy
- Department
of Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Claudia Caltagirone
- Department
of Chemical and Geological Sciences, University
of Cagliari and CSGI, s.s. 554 bivio Sestu, I-09042 Monserrato, CA, Italy
| | - Raffaele Mezzenga
- ETH
Zurich Department of Health Sciences & Technology, Schmelzbergstrasse 9, Zurich 8093, Switzerland
- ETH
Zurich
Department of Materials, Wolfgang-Pauli-Strasse 10, Zurich 8093, Switzerland
| | - Sergio Murgia
- Department
of Life and Environmental Sciences, University
of Cagliari and CSGI, via Ospedale 72, I-09124 Cagliari, Italy
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21
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Aiello CD, Abendroth JM, Abbas M, Afanasev A, Agarwal S, Banerjee AS, Beratan DN, Belling JN, Berche B, Botana A, Caram JR, Celardo GL, Cuniberti G, Garcia-Etxarri A, Dianat A, Diez-Perez I, Guo Y, Gutierrez R, Herrmann C, Hihath J, Kale S, Kurian P, Lai YC, Liu T, Lopez A, Medina E, Mujica V, Naaman R, Noormandipour M, Palma JL, Paltiel Y, Petuskey W, Ribeiro-Silva JC, Saenz JJ, Santos EJG, Solyanik-Gorgone M, Sorger VJ, Stemer DM, Ugalde JM, Valdes-Curiel A, Varela S, Waldeck DH, Wasielewski MR, Weiss PS, Zacharias H, Wang QH. A Chirality-Based Quantum Leap. ACS Nano 2022; 16:4989-5035. [PMID: 35318848 PMCID: PMC9278663 DOI: 10.1021/acsnano.1c01347] [Citation(s) in RCA: 44] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
There is increasing interest in the study of chiral degrees of freedom occurring in matter and in electromagnetic fields. Opportunities in quantum sciences will likely exploit two main areas that are the focus of this Review: (1) recent observations of the chiral-induced spin selectivity (CISS) effect in chiral molecules and engineered nanomaterials and (2) rapidly evolving nanophotonic strategies designed to amplify chiral light-matter interactions. On the one hand, the CISS effect underpins the observation that charge transport through nanoscopic chiral structures favors a particular electronic spin orientation, resulting in large room-temperature spin polarizations. Observations of the CISS effect suggest opportunities for spin control and for the design and fabrication of room-temperature quantum devices from the bottom up, with atomic-scale precision and molecular modularity. On the other hand, chiral-optical effects that depend on both spin- and orbital-angular momentum of photons could offer key advantages in all-optical and quantum information technologies. In particular, amplification of these chiral light-matter interactions using rationally designed plasmonic and dielectric nanomaterials provide approaches to manipulate light intensity, polarization, and phase in confined nanoscale geometries. Any technology that relies on optimal charge transport, or optical control and readout, including quantum devices for logic, sensing, and storage, may benefit from chiral quantum properties. These properties can be theoretically and experimentally investigated from a quantum information perspective, which has not yet been fully developed. There are uncharted implications for the quantum sciences once chiral couplings can be engineered to control the storage, transduction, and manipulation of quantum information. This forward-looking Review provides a survey of the experimental and theoretical fundamentals of chiral-influenced quantum effects and presents a vision for their possible future roles in enabling room-temperature quantum technologies.
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Affiliation(s)
- Clarice D. Aiello
- California
NanoSystems Institute, University of California,
Los Angeles, Los Angeles, California 90095, United States
- Department
of Electrical and Computer Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - John M. Abendroth
- Laboratory
for Solid State Physics, ETH Zürich, Zürich 8093, Switzerland
| | - Muneer Abbas
- Department
of Microbiology, Howard University, Washington, D.C. 20059, United States
| | - Andrei Afanasev
- Department
of Physics, George Washington University, Washington, D.C. 20052, United States
| | - Shivang Agarwal
- Department
of Electrical and Computer Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Amartya S. Banerjee
- California
NanoSystems Institute, University of California,
Los Angeles, Los Angeles, California 90095, United States
- Department
of Materials Science and Engineering, University
of California, Los Angeles, Los Angeles, California 90095, United States
| | - David N. Beratan
- Departments
of Chemistry, Biochemistry, and Physics, Duke University, Durham, North Carolina 27708, United States
| | - Jason N. Belling
- California
NanoSystems Institute, University of California,
Los Angeles, Los Angeles, California 90095, United States
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los Angeles, California 90095, United States
| | - Bertrand Berche
- Laboratoire
de Physique et Chimie Théoriques, UMR Université de Lorraine-CNRS, 7019 54506 Vandœuvre les
Nancy, France
| | - Antia Botana
- Department
of Physics, Arizona State University, Tempe, Arizona 85287, United States
| | - Justin R. Caram
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los Angeles, California 90095, United States
| | - Giuseppe Luca Celardo
- Institute
of Physics, Benemerita Universidad Autonoma
de Puebla, Apartado Postal J-48, 72570, Mexico
- Department
of Physics and Astronomy, University of
Florence, 50019 Sesto Fiorentino, Italy
| | - Gianaurelio Cuniberti
- Institute
for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, 01062 Dresden, Germany
| | - Aitzol Garcia-Etxarri
- Donostia
International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia, San Sebastian, Spain
- IKERBASQUE,
Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain
| | - Arezoo Dianat
- Institute
for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, 01062 Dresden, Germany
| | - Ismael Diez-Perez
- Department
of Chemistry, Faculty of Natural and Mathematical Sciences, King’s College London, 7 Trinity Street, London SE1 1DB, United Kingdom
| | - Yuqi Guo
- School
for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
| | - Rafael Gutierrez
- Institute
for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, 01062 Dresden, Germany
| | - Carmen Herrmann
- Department
of Chemistry, University of Hamburg, 20146 Hamburg, Germany
| | - Joshua Hihath
- Department
of Electrical and Computer Engineering, University of California, Davis, Davis, California 95616, United States
| | - Suneet Kale
- School
of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Philip Kurian
- Quantum
Biology Laboratory, Graduate School, Howard
University, Washington, D.C. 20059, United States
| | - Ying-Cheng Lai
- School
of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287, United States
| | - Tianhan Liu
- California
NanoSystems Institute, University of California,
Los Angeles, Los Angeles, California 90095, United States
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los Angeles, California 90095, United States
| | - Alexander Lopez
- Escuela
Superior Politécnica del Litoral, ESPOL, Campus Gustavo Galindo Km. 30.5 Vía Perimetral, PO Box 09-01-5863, Guayaquil 090902, Ecuador
| | - Ernesto Medina
- Departamento
de Física, Colegio de Ciencias e Ingeniería, Universidad San Francisco de Quito, Av. Diego de Robles
y Vía Interoceánica, Quito 170901, Ecuador
| | - Vladimiro Mujica
- School
of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
- Kimika
Fakultatea, Euskal Herriko Unibertsitatea, 20080 Donostia, Euskadi, Spain
| | - Ron Naaman
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Mohammadreza Noormandipour
- Department
of Electrical and Computer Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
- TCM Group,
Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Julio L. Palma
- Department
of Chemistry, Pennsylvania State University, Lemont Furnace, Pennsylvania 15456, United States
| | - Yossi Paltiel
- Applied
Physics Department and the Center for Nano-Science and Nano-Technology, Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - William Petuskey
- School
of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - João Carlos Ribeiro-Silva
- Laboratory
of Genetics and Molecular Cardiology, Heart Institute, University of São Paulo Medical School, 05508-900 São
Paulo, Brazil
| | - Juan José Saenz
- Donostia
International Physics Center, Paseo Manuel de Lardizabal 4, 20018 Donostia, San Sebastian, Spain
- IKERBASQUE,
Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain
| | - Elton J. G. Santos
- Institute
for Condensed Matter Physics and Complex Systems, School of Physics
and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
- Higgs Centre
for Theoretical Physics, The University
of Edinburgh, Edinburgh, EH9 3FD, United Kingdom
| | - Maria Solyanik-Gorgone
- Department
of Electrical and Computer Engineering, George Washington University, Washington, D.C. 20052, United States
| | - Volker J. Sorger
- Department
of Electrical and Computer Engineering, George Washington University, Washington, D.C. 20052, United States
| | - Dominik M. Stemer
- California
NanoSystems Institute, University of California,
Los Angeles, Los Angeles, California 90095, United States
- Department
of Materials Science and Engineering, University
of California, Los Angeles, Los Angeles, California 90095, United States
| | - Jesus M. Ugalde
- Kimika
Fakultatea, Euskal Herriko Unibertsitatea, 20080 Donostia, Euskadi, Spain
| | - Ana Valdes-Curiel
- California
NanoSystems Institute, University of California,
Los Angeles, Los Angeles, California 90095, United States
- Department
of Electrical and Computer Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Solmar Varela
- School
of Chemical Sciences and Engineering, Yachay
Tech University, 100119 Urcuquí, Ecuador
| | - David H. Waldeck
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Michael R. Wasielewski
- Department
of Chemistry, Center for Molecular Quantum Transduction, and Institute
for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Paul S. Weiss
- California
NanoSystems Institute, University of California,
Los Angeles, Los Angeles, California 90095, United States
- Department
of Materials Science and Engineering, University
of California, Los Angeles, Los Angeles, California 90095, United States
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los Angeles, California 90095, United States
- Department
of Bioengineering, University of California,
Los Angeles, Los Angeles, California, 90095, United States
| | - Helmut Zacharias
- Center
for Soft Nanoscience, University of Münster, 48149 Münster, Germany
| | - Qing Hua Wang
- School
for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
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22
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Schönfeldová T, Okur HI, Vezočnik V, Iacovache I, Cao C, Dal Peraro M, Maček P, Zuber B, Roke S. Ultrasensitive Label-Free Detection of Protein-Membrane Interaction Exemplified by Toxin-Liposome Insertion. J Phys Chem Lett 2022; 13:3197-3201. [PMID: 35377651 PMCID: PMC9014461 DOI: 10.1021/acs.jpclett.1c04011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Accepted: 03/29/2022] [Indexed: 06/14/2023]
Abstract
Measuring the high-affinity binding of proteins to liposome membranes remains a challenge. Here, we show an ultrasensitive and direct detection of protein binding to liposome membranes using high throughput second harmonic scattering (SHS). Perfringolysin O (PFO), a pore-forming toxin, with a highly membrane selective insertion into cholesterol-rich membranes is used. PFO inserts only into liposomes with a cholesterol concentration >30%. Twenty mole-percent cholesterol results in neither SHS-signal deviation nor pore formation as seen by cryo-electron microscopy of PFO and liposomes. PFO inserts into cholesterol-rich membranes of large unilamellar vesicles in an aqueous solution with Kd = (1.5 ± 0.2) × 10-12 M. Our results demonstrate a promising approach to probe protein-membrane interactions below sub-picomolar concentrations in a label-free and noninvasive manner on 3D systems. More importantly, the volume of protein sample is ultrasmall (<10 μL). These findings enable the detection of low-abundance proteins and their interaction with membranes.
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Affiliation(s)
- T. Schönfeldová
- Laboratory
for fundamental BioPhotonics (LBP), Institute of Bio-engineering (IBI),
School of Engineering (STI), École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
| | - H. I. Okur
- Laboratory
for fundamental BioPhotonics (LBP), Institute of Bio-engineering (IBI),
School of Engineering (STI), École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Department
of Chemistry and National Nanotechnology Research Center (UNAM), Bilkent University, 06800 Ankara, Turkey
| | - V. Vezočnik
- Department
of Biology, Biotechnical Faculty, University
of Ljubljana, Jamnikarjeva 101, Ljubljana 1000, Slovenia
| | - I. Iacovache
- Institute
of Anatomy, University of Bern, Baltzerstrasse 2, 3012 Bern, Switzerland
| | - C. Cao
- Institute
of Bioengineering, School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - M. Dal Peraro
- Institute
of Bioengineering, School of Life Sciences, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - P. Maček
- Department
of Biology, Biotechnical Faculty, University
of Ljubljana, Jamnikarjeva 101, Ljubljana 1000, Slovenia
| | - B. Zuber
- Institute
of Anatomy, University of Bern, Baltzerstrasse 2, 3012 Bern, Switzerland
| | - S. Roke
- Laboratory
for fundamental BioPhotonics (LBP), Institute of Bio-engineering (IBI),
School of Engineering (STI), École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
- Institute
of Materials Science (IMX) and Lausanne Centre for Ultrafast Science
(LACUS), École Polytechnique Fédérale
de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
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23
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Stelzl L, Pietrek LM, Holla A, Oroz J, Sikora M, Köfinger J, Schuler B, Zweckstetter M, Hummer G. Global Structure of the Intrinsically Disordered Protein Tau Emerges from Its Local Structure. JACS Au 2022; 2:673-686. [PMID: 35373198 PMCID: PMC8970000 DOI: 10.1021/jacsau.1c00536] [Citation(s) in RCA: 33] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Indexed: 05/13/2023]
Abstract
The paradigmatic disordered protein tau plays an important role in neuronal function and neurodegenerative diseases. To disentangle the factors controlling the balance between functional and disease-associated conformational states, we build a structural ensemble of the tau K18 fragment containing the four pseudorepeat domains involved in both microtubule binding and amyloid fibril formation. We assemble 129-residue-long tau K18 chains with atomic detail from an extensive fragment library constructed with molecular dynamics simulations. We introduce a reweighted hierarchical chain growth (RHCG) algorithm that integrates experimental data reporting on the local structure into the assembly process in a systematic manner. By combining Bayesian ensemble refinement with importance sampling, we obtain well-defined ensembles and overcome the problem of exponentially varying weights in the integrative modeling of long-chain polymeric molecules. The resulting tau K18 ensembles capture nuclear magnetic resonance (NMR) chemical shift and J-coupling measurements. Without further fitting, we achieve very good agreement with measurements of NMR residual dipolar couplings. The good agreement with experimental measures of global structure such as single-molecule Förster resonance energy transfer (FRET) efficiencies is improved further by ensemble refinement. By comparing wild-type and mutant ensembles, we show that pathogenic single-point P301L, P301S, and P301T mutations shift the population from the turn-like conformations of the functional microtubule-bound state to the extended conformations of disease-associated tau fibrils. RHCG thus provides us with an atomically detailed view of the population equilibrium between functional and aggregation-prone states of tau K18, and demonstrates that global structural characteristics of this intrinsically disordered protein emerge from its local structure.
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Affiliation(s)
- Lukas
S. Stelzl
- Department
of Theoretical Biophysics, Max Planck Institute
of Biophysics, Max-von-Laue-Straße 3, 60438 Frankfurt am Main, Germany
- Faculty
of Biology, Johannes Gutenberg University
Mainz, Gresemundweg 2, 55128 Mainz, Germany
- KOMET 1, Institute of Physics, Johannes
Gutenberg University Mainz, 55099 Mainz, Germany
- Institute of Molecular Biology (IMB), 55128 Mainz, Germany
| | - Lisa M. Pietrek
- Department
of Theoretical Biophysics, Max Planck Institute
of Biophysics, Max-von-Laue-Straße 3, 60438 Frankfurt am Main, Germany
| | - Andrea Holla
- Department
of Biochemistry, University of Zurich, 8057 Zurich, Switzerland
| | - Javier Oroz
- German
Center for Neurodegenerative Diseases (DZNE), von-Siebold-Str. 3a, 37075 Göttingen, Germany
- Rocasolano
Institute for Physical Chemistry, CSIC, Serrano 119, 28006 Madrid, Spain
| | - Mateusz Sikora
- Department
of Theoretical Biophysics, Max Planck Institute
of Biophysics, Max-von-Laue-Straße 3, 60438 Frankfurt am Main, Germany
- Faculty
of Physics, University of Vienna, Kolingasse 14-16, 1090 Vienna, Austria
| | - Jürgen Köfinger
- Department
of Theoretical Biophysics, Max Planck Institute
of Biophysics, Max-von-Laue-Straße 3, 60438 Frankfurt am Main, Germany
| | - Benjamin Schuler
- Department
of Biochemistry, University of Zurich, 8057 Zurich, Switzerland
- Department
of Physics, University of Zurich, 8057 Zurich, Switzerland
| | - Markus Zweckstetter
- German
Center for Neurodegenerative Diseases (DZNE), von-Siebold-Str. 3a, 37075 Göttingen, Germany
- Department
for NMR-based Structural Biology, Max Planck
Institute for Multidisciplinary Sciences, Am Faßberg 11, 37077 Göttingen, Germany
| | - Gerhard Hummer
- Department
of Theoretical Biophysics, Max Planck Institute
of Biophysics, Max-von-Laue-Straße 3, 60438 Frankfurt am Main, Germany
- Institute
for Biophysics, Goethe University Frankfurt, Max-von-Laue-Straße 9, 60438 Frankfurt am Main, Germany
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24
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Li S, Vahdat MT, Huang S, Hsu KJ, Rezaei M, Mensi M, Marzari N, Agrawal KV. Structure Evolution of Graphitic Surface upon Oxidation: Insights by Scanning Tunneling Microscopy. JACS Au 2022; 2:723-730. [PMID: 35373205 PMCID: PMC8970004 DOI: 10.1021/jacsau.1c00570] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Indexed: 05/31/2023]
Abstract
Oxidation of graphitic materials has been studied for more than a century to synthesize materials such as graphene oxide, nanoporous graphene, and to cut or unzip carbon nanotubes. However, the understanding of the early stages of oxidation is limited to theoretical studies, and experimental validation has been elusive. This is due to (i) challenging sample preparation for characterization because of the presence of highly mobile and reactive epoxy groups formed during oxidation, and (ii) gasification of the functional groups during imaging with atomic resolution, e.g., by transmission electron microscopy. Herein, we utilize a low-temperature scanning tunneling microscope (LT-STM) operating at 4 K to solve the structure of epoxy clusters form upon oxidation. Three distinct nanostructures corresponding to three stages of evolution of vacancy defects are found by quantitatively verifying the experimental data by the van der Waals density functional theory. The smallest cluster is a cyclic epoxy trimer. Their observation validates the theoretical prediction that epoxy trimers minimize the energy in the cyclic structure. The trimers grow into honeycomb superstructures to form larger clusters (1-3 nm). Vacancy defects evolve only in the larger clusters (2-3 nm) in the middle of the cluster, highlighting the role of lattice strain in the generation of vacancies. Semiquinone groups are also present and are assigned at the carbon edge in the vacancy defects. Upon heating to 800 °C, we observe cluster-free vacancy defects resulting from the loss of the entire epoxy population, indicating a reversible functionalization of epoxy groups.
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Affiliation(s)
- Shaoxian Li
- Laboratory
of Advanced Separations (LAS), École
Polytechnique Fédérale de Lausanne (EPFL), Sion 1950, Switzerland
| | - Mohammad Tohidi Vahdat
- Laboratory
of Advanced Separations (LAS), École
Polytechnique Fédérale de Lausanne (EPFL), Sion 1950, Switzerland
- Theory
and Simulation of Materials (THEOS), National Centre for Computational
Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Shiqi Huang
- Laboratory
of Advanced Separations (LAS), École
Polytechnique Fédérale de Lausanne (EPFL), Sion 1950, Switzerland
| | - Kuang-Jung Hsu
- Laboratory
of Advanced Separations (LAS), École
Polytechnique Fédérale de Lausanne (EPFL), Sion 1950, Switzerland
| | - Mojtaba Rezaei
- Laboratory
of Advanced Separations (LAS), École
Polytechnique Fédérale de Lausanne (EPFL), Sion 1950, Switzerland
| | - Mounir Mensi
- Institut
des Sciences et Ingénierie Chimiques (ISIC), École Polytechnique Fédérale de Lausanne (EPFL), Sion 1950, Switzerland
| | - Nicola Marzari
- Theory
and Simulation of Materials (THEOS), National Centre for Computational
Design and Discovery of Novel Materials (MARVEL), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Kumar Varoon Agrawal
- Laboratory
of Advanced Separations (LAS), École
Polytechnique Fédérale de Lausanne (EPFL), Sion 1950, Switzerland
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25
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Lauper B, Anthamatten E, Raths J, Arlos M, Hollender J. Systematic Underestimation of Pesticide Burden for Invertebrates under Field Conditions: Comparing the Influence of Dietary Uptake and Aquatic Exposure Dynamics. ACS Environ Au 2022; 2:166-175. [PMID: 37101586 PMCID: PMC10114668 DOI: 10.1021/acsenvironau.1c00023] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Pesticides used in agriculture can end up in nearby streams and can have a negative impact on nontarget organisms such as aquatic invertebrates. During registration, bioaccumulation potential is often investigated using laboratory tests only. Recent studies showed that the magnitude of bioaccumulation in the field substantially differs from laboratory conditions. To investigate this discrepancy, we conducted a field bioaccumulation study in a stream known to receive pollutant loadings from agriculture. Our work incorporates measurements of stream pesticide concentrations at high temporal resolution (every 20 min), as well as sediment, leaves, and caged gammarid analyses (every 2-24 h) over several weeks. Of 49 investigated pesticides, 14 were detected in gammarids with highly variable concentrations of up to 140 ± 28 ng/gww. Toxicokinetic modeling using laboratory-derived uptake and depuration rate constants for azoxystrobin, cyprodinil, and fluopyram showed that despite the highly resolved water concentrations measured, the pesticide burden on gammarids remains underestimated by a factor of 1.9 ± 0.1 to 31 ± 3.0, with the highest underestimations occurring after rain events. Including dietary uptake from polluted detritus leaves and sediment in the model explained this underestimation only to a minor proportion. However, suspended solids analyzed during rain events had high pesticide concentrations, and uptake from them could partially explain the underestimation after rain events. Additional comparison between the measured and modeled data showed that the pesticide depuration in gammarids is slower in the field. This observation suggests that several unknown mechanisms may play a role, including lowered enzyme expression and mixture effects. Thus, it is important to conduct such retrospective risk assessments based on field investigations and adapt the registration accordingly.
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Affiliation(s)
- Benedikt
B. Lauper
- Department
of Environmental Chemistry, Eawag, 8600 Dübendorf, Switzerland
- Institute
of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland
| | - Eva Anthamatten
- Department
of Environmental Chemistry, Eawag, 8600 Dübendorf, Switzerland
- Institute
of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland
| | - Johannes Raths
- Department
of Environmental Chemistry, Eawag, 8600 Dübendorf, Switzerland
- Institute
of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland
| | - Maricor Arlos
- Department
of Environmental Chemistry, Eawag, 8600 Dübendorf, Switzerland
- Department
of Civil and Environmental Engineering, University of Alberta, 9211-116 St. NW, Edmonton, T6G 1H9 AB, Canada
| | - Juliane Hollender
- Department
of Environmental Chemistry, Eawag, 8600 Dübendorf, Switzerland
- Institute
of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland
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26
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Nie L, Nusantara AC, Damle VG, Baranov MV, Chipaux M, Reyes-San-Martin C, Hamoh T, Epperla CP, Guricova M, Cigler P, van den Bogaart G, Schirhagl R. Quantum Sensing of Free Radicals in Primary Human Dendritic Cells. Nano Lett 2022; 22:1818-1825. [PMID: 34929080 PMCID: PMC8880378 DOI: 10.1021/acs.nanolett.1c03021] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/06/2021] [Indexed: 05/21/2023]
Abstract
Free radicals are crucial indicators for stress and appear in all kinds of pathogenic conditions, including cancer, cardiovascular diseases, and infection. However, they are difficult to detect due to their reactivity and low abundance. We use relaxometry for the detection of radicals with subcellular resolution. This method is based on a fluorescent defect in a diamond, which changes its optical properties on the basis of the magnetic surroundings. This technique allows nanoscale MRI with unprecedented sensitivity and spatial resolution. Recently, this technique was used inside living cells from a cell line. Cell lines differ in terms of endocytic capability and radical production from primary cells derived from patients. Here we provide the first measurements of phagocytic radical production by the NADPH oxidase (NOX2) in primary dendritic cells from healthy donors. The radical production of these cells differs greatly between donors. We investigated the cell response to stimulation or inhibition.
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Affiliation(s)
- Linyan Nie
- University
of Groningen, University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Anggrek C. Nusantara
- University
of Groningen, University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Viraj G. Damle
- University
of Groningen, University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Maxim V. Baranov
- University
of Groningen, Department of Molecular Immunology,
Groningen Biomolecular Sciences and Biotechnology Institute, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Mayeul Chipaux
- Institute
of Physics, École Polytechnique Fédérale
de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Claudia Reyes-San-Martin
- University
of Groningen, University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Thamir Hamoh
- University
of Groningen, University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Chandra Prakash Epperla
- Institute
of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 166 10 Prague, Czech Republic
| | - Miroslava Guricova
- Institute
of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 166 10 Prague, Czech Republic
| | - Petr Cigler
- Institute
of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nam. 2, 166 10 Prague, Czech Republic
| | - Geert van den Bogaart
- University
of Groningen, Department of Molecular Immunology,
Groningen Biomolecular Sciences and Biotechnology Institute, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Romana Schirhagl
- University
of Groningen, University Medical Center Groningen, Department of Biomedical Engineering, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
- Email for R.S.:
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27
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Merkt F, Höveler K, Deiglmayr J. Reactions of H 2, HD, and D 2 with H 2+, HD +, and D 2+: Product-Channel Branching Ratios and Simple Models. J Phys Chem Lett 2022; 13:864-871. [PMID: 35045261 PMCID: PMC8802320 DOI: 10.1021/acs.jpclett.1c03374] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 11/30/2021] [Indexed: 06/14/2023]
Abstract
We present measurements of the product-channel branching ratios of the reactions (i) HD+ + HD forming H2D+ + D (38.1(30)%) and HD2+ + H (61.9(30)%), (ii) HD+ + D2 forming HD2+ + D (61.4(35)%) and D3+ + H (38.6(35)%), and (iii) D2+ + HD forming HD2++ D (60.5(20)%) and D3+ + H (39.5(20)%) at collision energies Ecoll near zero, i.e., below kB × 1 K. These branching ratios are compared with branching ratios predicted using three simple models: a combinatorial model (M1), a model (M2) describing the reactions as H-, H+-, D-, and D+-transfer processes, and a statistical model (M3) that relates the reaction rate coefficients to the translational and rovibrational state densities of the HnD3-n+ + H/D (n = 0, 1, 2 or 3) product channels. The experimental data are incompatible with the predictions of models M1 and M2 and reveal that the branching ratios exhibit clear correlations with the product state densities.
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Affiliation(s)
- Frédéric Merkt
- Laboratorium für
Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | - Katharina Höveler
- Laboratorium für
Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland
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28
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Abstract
Phase separation is a ubiquitous process and finds applications in a variety of biological, organic, and inorganic systems. Nature has evolved the ability to control phase separation to both regulate cellular processes and make composite materials with outstanding mechanical and optical properties. Striking examples of the latter are the vibrant blue and green feathers of many bird species, which are thought to result from an exquisite control of the size and spatial correlations of their phase-separated microstructures. By contrast, it is much harder for material scientists to arrest and control phase separation in synthetic materials with such a high level of precision at these length scales. In this Perspective, we briefly review some established methods to control liquid-liquid phase separation processes and then highlight the emergence of a promising arrest method based on phase separation in an elastic polymer network. Finally, we discuss upcoming challenges and opportunities for fabricating microstructured materials via mechanically controlled phase separation.
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29
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Seitz M, Meléndez M, York P, Kurtz DA, Magdaleno AJ, Alcázar-Cano N, Kshirsagar AS, Gangishetty MK, Delgado-Buscalioni R, Congreve DN, Prins F. Halide Mixing Inhibits Exciton Transport in Two-dimensional Perovskites Despite Phase Purity. ACS Energy Lett 2022; 7:358-365. [PMID: 35059502 PMCID: PMC8762701 DOI: 10.1021/acsenergylett.1c02403] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 12/10/2021] [Indexed: 05/28/2023]
Abstract
Halide mixing is one of the most powerful techniques to tune the optical bandgap of metal-halide perovskites. However, halide mixing has commonly been observed to result in phase segregation, which reduces excited-state transport and limits device performance. While the current emphasis lies on the development of strategies to prevent phase segregation, it remains unclear how halide mixing may affect excited-state transport even if phase purity is maintained. Here, we study exciton transport in phase pure mixed-halide 2D perovskites of (PEA)2Pb(I1-x Br x )4. Using transient photoluminescence microscopy, we show that, despite phase purity, halide mixing inhibits exciton transport. We find a significant reduction even for relatively low alloying concentrations. By performing Brownian dynamics simulations, we are able to reproduce our experimental results and attribute the decrease in diffusivity to the energetically disordered potential landscape that arises due to the intrinsic random distribution of alloying sites.
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Affiliation(s)
- Michael Seitz
- Condensed
Matter Physics Center (IFIMAC), Autonomous
University of Madrid, 28049 Madrid, Spain
- Department
of Condensed Matter Physics, Autonomous
University of Madrid, 28049 Madrid, Spain
- Rowland
Institute at Harvard University, Cambridge, Massachusetts 02142, United States
- Department
of Electrical Engineering, Stanford University, Stanford, California 94305, United States
| | - Marc Meléndez
- Department
of Theoretical Condensed Matter Physics, Autonomous University of Madrid, 28049 Madrid, Spain
| | - Peyton York
- Department
of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Daniel A. Kurtz
- Rowland
Institute at Harvard University, Cambridge, Massachusetts 02142, United States
| | - Alvaro J. Magdaleno
- Condensed
Matter Physics Center (IFIMAC), Autonomous
University of Madrid, 28049 Madrid, Spain
- Department
of Condensed Matter Physics, Autonomous
University of Madrid, 28049 Madrid, Spain
| | - Nerea Alcázar-Cano
- Condensed
Matter Physics Center (IFIMAC), Autonomous
University of Madrid, 28049 Madrid, Spain
- Department
of Theoretical Condensed Matter Physics, Autonomous University of Madrid, 28049 Madrid, Spain
| | - Anuraj S. Kshirsagar
- Department
of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Mahesh K. Gangishetty
- Rowland
Institute at Harvard University, Cambridge, Massachusetts 02142, United States
- Department
of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Rafael Delgado-Buscalioni
- Condensed
Matter Physics Center (IFIMAC), Autonomous
University of Madrid, 28049 Madrid, Spain
- Department
of Theoretical Condensed Matter Physics, Autonomous University of Madrid, 28049 Madrid, Spain
| | - Daniel N. Congreve
- Rowland
Institute at Harvard University, Cambridge, Massachusetts 02142, United States
- Department
of Electrical Engineering, Stanford University, Stanford, California 94305, United States
| | - Ferry Prins
- Condensed
Matter Physics Center (IFIMAC), Autonomous
University of Madrid, 28049 Madrid, Spain
- Department
of Condensed Matter Physics, Autonomous
University of Madrid, 28049 Madrid, Spain
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30
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Liu Z, Moreira RA, Dujmović A, Liu H, Yang B, Poma AB, Nash MA. Mapping Mechanostable Pulling Geometries of a Therapeutic Anticalin/CTLA-4 Protein Complex. Nano Lett 2022; 22:179-187. [PMID: 34918516 PMCID: PMC8759085 DOI: 10.1021/acs.nanolett.1c03584] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 11/03/2021] [Indexed: 05/27/2023]
Abstract
We used single-molecule AFM force spectroscopy (AFM-SMFS) in combination with click chemistry to mechanically dissociate anticalin, a non-antibody protein binding scaffold, from its target (CTLA-4), by pulling from eight different anchor residues. We found that pulling on the anticalin from residue 60 or 87 resulted in significantly higher rupture forces and a decrease in koff by 2-3 orders of magnitude over a force range of 50-200 pN. Five of the six internal anchor points gave rise to complexes significantly more stable than N- or C-terminal anchor points, rupturing at up to 250 pN at loading rates of 0.1-10 nN s-1. Anisotropic network modeling and molecular dynamics simulations helped to explain the geometric dependency of mechanostability. These results demonstrate that optimization of attachment residue position on therapeutic binding scaffolds can provide large improvements in binding strength, allowing for mechanical affinity maturation under shear stress without mutation of binding interface residues.
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Affiliation(s)
- Zhaowei Liu
- Institute
of Physical Chemistry, Department of Chemistry, University of Basel, 4058 Basel, Switzerland
- Department
of Biosystems Science and Engineering, ETH
Zurich, 4058 Basel, Switzerland
| | - Rodrigo A. Moreira
- Biosystems
and Soft Matter Division, Institute of Fundamental
Technological Research, Polish Academy of Sciences, Pawińskiego 5B, 02-106 Warsaw, Poland
| | - Ana Dujmović
- Institute
of Physical Chemistry, Department of Chemistry, University of Basel, 4058 Basel, Switzerland
- Department
of Biosystems Science and Engineering, ETH
Zurich, 4058 Basel, Switzerland
| | - Haipei Liu
- Institute
of Physical Chemistry, Department of Chemistry, University of Basel, 4058 Basel, Switzerland
- Department
of Biosystems Science and Engineering, ETH
Zurich, 4058 Basel, Switzerland
| | - Byeongseon Yang
- Institute
of Physical Chemistry, Department of Chemistry, University of Basel, 4058 Basel, Switzerland
- Department
of Biosystems Science and Engineering, ETH
Zurich, 4058 Basel, Switzerland
| | - Adolfo B. Poma
- Biosystems
and Soft Matter Division, Institute of Fundamental
Technological Research, Polish Academy of Sciences, Pawińskiego 5B, 02-106 Warsaw, Poland
- International
Center for Research on Innovative Biobased Materials (ICRI-BioM)—International
Research Agenda, Lodz University of Technology, Żeromskiego 116, 90-924 Lodz, Poland
| | - Michael A. Nash
- Institute
of Physical Chemistry, Department of Chemistry, University of Basel, 4058 Basel, Switzerland
- Department
of Biosystems Science and Engineering, ETH
Zurich, 4058 Basel, Switzerland
- National
Center for Competence in Research (NCCR) Molecular Systems Engineering, 4058 Basel, Switzerland
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31
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Debbarma R, Potts H, Stenberg CJ, Tsintzis A, Lehmann S, Dick K, Leijnse M, Thelander C. Effects of Parity and Symmetry on the Aharonov-Bohm Phase of a Quantum Ring. Nano Lett 2022; 22:334-339. [PMID: 34910870 PMCID: PMC8759086 DOI: 10.1021/acs.nanolett.1c03882] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 12/03/2021] [Indexed: 06/14/2023]
Abstract
We experimentally investigate the properties of one-dimensional quantum rings that form near the surface of nanowire quantum dots. In agreement with theoretical predictions, we observe the appearance of forbidden gaps in the evolution of states in a magnetic field as the symmetry of a quantum ring is reduced. For a twofold symmetry, our experiments confirm that orbital states are grouped pairwise. Here, a π-phase shift can be introduced in the Aharonov-Bohm relation by controlling the relative orbital parity using an electric field. Studying rings with higher symmetry, we note exceptionally large orbital contributions to the effective g-factor (up to 300), which are many times higher than those previously reported. These findings show that the properties of a phase-coherent system can be significantly altered by the nanostructure symmetry and its interplay with wave function parity.
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Affiliation(s)
- Rousan Debbarma
- Division
of Solid State Physics and NanoLund and Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden
| | - Heidi Potts
- Division
of Solid State Physics and NanoLund and Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden
| | - Calle Janlén Stenberg
- Division
of Solid State Physics and NanoLund and Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden
| | - Athanasios Tsintzis
- Division
of Solid State Physics and NanoLund and Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden
| | - Sebastian Lehmann
- Division
of Solid State Physics and NanoLund and Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden
| | - Kimberly Dick
- Division
of Solid State Physics and NanoLund and Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden
| | - Martin Leijnse
- Division
of Solid State Physics and NanoLund and Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden
| | - Claes Thelander
- Division
of Solid State Physics and NanoLund and Center for Analysis and Synthesis, Lund University, S-221 00 Lund, Sweden
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32
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Severini L, De France KJ, Sivaraman D, Kummer N, Nyström G. Biohybrid Nanocellulose-Lysozyme Amyloid Aerogels via Electrostatic Complexation. ACS Omega 2022; 7:578-586. [PMID: 35036725 PMCID: PMC8757363 DOI: 10.1021/acsomega.1c05069] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 11/25/2021] [Indexed: 05/04/2023]
Abstract
Modern science is increasingly turning to nature for inspiration to design sustainable biomaterials in a smart and effective way. Herein, we describe biohybrid aerogels based on electrostatic complexation between cellulose and proteins-two of the most abundant natural polymers on Earth. The effects of both particle surface charge and particle size are investigated with respect to aerogel properties including the morphology, surface area, stability, and mechanical strength. Specifically, negatively charged nanocellulose (cellulose nanocrystals and cellulose nanofibers) and positively charged lysozyme amyloid fibers (full-length and shortened via sonication) are investigated in the preparation of fibrillar aerogels, whereby the nanocellulose component was found to have the largest effect on the resulting aerogel properties. Although electrostatic interactions between these two classes of charged nanoparticles allow us to avoid the use of any cross-linking agents, the resulting aerogels demonstrate a simple additive performance as compared to their respective single-component aerogels. This lack of synergy indicates that although electrostatic complexation certainly leads to the formation of local aggregates, these interactions alone may not be strong enough to synergistically improve bulk aerogel properties. Nevertheless, the results reported herein represent a critical step toward a broader understanding of biohybrid materials based on cellulose and proteins.
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Affiliation(s)
- Leonardo Severini
- Department
of Chemical Sciences and Technologies, University
of Rome “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Rome, Italy
- Laboratory
for Cellulose & Wood Materials, Empa—Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Kevin J. De France
- Laboratory
for Cellulose & Wood Materials, Empa—Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
| | - Deeptanshu Sivaraman
- Laboratory
for Building Energy Materials and Components, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Nico Kummer
- Laboratory
for Cellulose & Wood Materials, Empa—Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
- Department
of Health Science and Technology, ETH Zürich, Schmelzbergstrasse 9, 8092 Zürich, Switzerland
| | - Gustav Nyström
- Laboratory
for Cellulose & Wood Materials, Empa—Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
- Department
of Health Science and Technology, ETH Zürich, Schmelzbergstrasse 9, 8092 Zürich, Switzerland
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33
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Majumdar S, Moosavi SM, Jablonka KM, Ongari D, Smit B. Diversifying Databases of Metal Organic Frameworks for High-Throughput Computational Screening. ACS Appl Mater Interfaces 2021; 13:61004-61014. [PMID: 34910455 PMCID: PMC8719320 DOI: 10.1021/acsami.1c16220] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 12/03/2021] [Indexed: 05/19/2023]
Abstract
By combining metal nodes and organic linkers, an infinite number of metal organic frameworks (MOFs) can be designed in silico. Therefore, when making new databases of such hypothetical MOFs, we need to ensure that they not only contribute toward the growth of the count of structures but also add different chemistries to the existing databases. In this study, we designed a database of ∼20,000 hypothetical MOFs, which are diverse in terms of their chemical design space─metal nodes, organic linkers, functional groups, and pore geometries. Using machine learning techniques, we visualized and quantified the diversity of these structures. We find that on adding the structures of our database, the overall diversity metrics of hypothetical databases improve, especially in terms of the chemistry of metal nodes. We then assessed the usefulness of diverse structures by evaluating their performance, using grand-canonical Monte Carlo simulations, in two important environmental applications─post-combustion carbon capture and hydrogen storage. We find that many of these structures perform better than widely used benchmark materials such as Zeolite-13X (for post-combustion carbon capture) and MOF-5 (for hydrogen storage). All the structures developed in this study, and their properties, are provided on the Materials Cloud to encourage further use of these materials for other applications.
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34
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Olaya AJ, Riva JS, Baster D, Silva WO, Pichard F, Girault HH. Visible-Light-Driven Water Oxidation on Self-Assembled Metal-Free Organic@Carbon Junctions at Neutral pH. JACS Au 2021; 1:2294-2302. [PMID: 34977899 PMCID: PMC8715488 DOI: 10.1021/jacsau.1c00408] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Indexed: 06/14/2023]
Abstract
Sustainable water oxidation requires low-cost, stable, and efficient redox couples, photosensitizers, and catalysts. Here, we introduce the in situ self-assembly of metal-atom-free organic-based semiconductive structures on the surface of carbon supports. The resulting TTF/TTF•+@carbon junction (TTF = tetrathiafulvalene) acts as an all-in-one highly stable redox-shuttle/photosensitizer/molecular-catalyst triad for the visible-light-driven water oxidation reaction (WOR) at neutral pH, eliminating the need for metallic or organometallic catalysts and sacrificial electron acceptors. A water/butyronitrile emulsion was used to physically separate the photoproducts of the WOR, H+ and TTF, allowing the extraction and subsequent reduction of protons in water, and the in situ electrochemical oxidation of TTF to TTF•+ on carbon in butyronitrile by constant anode potential electrolysis. During 100 h, no decomposition of TTF was observed and O2 was generated from the emulsion while H2 was constantly produced in the aqueous phase. This work opens new perspectives for a new generation of metal-atom-free, low-cost, redox-driven water-splitting strategies.
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Affiliation(s)
- Astrid J. Olaya
- Laboratory
of Physical and Analytical Electrochemistry, EPFL Valais Wallis, École Polytechnique Fédérale
de Lausanne, CH-1951 Sion, Switzerland
| | - Julieta S. Riva
- Laboratory
of Physical and Analytical Electrochemistry, EPFL Valais Wallis, École Polytechnique Fédérale
de Lausanne, CH-1951 Sion, Switzerland
- Consejo
Nacional de Investigaciones Científicas y Técnicas,
CONICET, Facultad de Matemática, Astronomía, Física
y Computación, Universidad Nacional
de Córdoba, Medina Allende s/n, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Dominika Baster
- Laboratory
of Physical and Analytical Electrochemistry, EPFL Valais Wallis, École Polytechnique Fédérale
de Lausanne, CH-1951 Sion, Switzerland
| | - Wanderson O. Silva
- Laboratory
of Physical and Analytical Electrochemistry, EPFL Valais Wallis, École Polytechnique Fédérale
de Lausanne, CH-1951 Sion, Switzerland
| | - François Pichard
- Laboratory
of Physical and Analytical Electrochemistry, EPFL Valais Wallis, École Polytechnique Fédérale
de Lausanne, CH-1951 Sion, Switzerland
| | - Hubert H. Girault
- Laboratory
of Physical and Analytical Electrochemistry, EPFL Valais Wallis, École Polytechnique Fédérale
de Lausanne, CH-1951 Sion, Switzerland
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35
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Heinze W, Mitrano DM, Lahive E, Koestel J, Cornelis G. Nanoplastic Transport in Soil via Bioturbation by Lumbricus terrestris. Environ Sci Technol 2021; 55:16423-16433. [PMID: 34878261 PMCID: PMC8697554 DOI: 10.1021/acs.est.1c05614] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 10/25/2021] [Accepted: 11/15/2021] [Indexed: 06/01/2023]
Abstract
Plastic pollution is increasingly perceived as an emerging threat to terrestrial environments, but the spatial and temporal dimension of plastic exposure in soils is poorly understood. Bioturbation displaces microplastics (>1 μm) in soils and likely also nanoplastics (<1 μm), but empirical evidence is lacking. We used a combination of methods that allowed us to not only quantify but to also understand the mechanisms of biologically driven transport of nanoplastics in microcosms with the deep-burrowing earthworm Lumbricus terrestris. We hypothesized that ingestion and subsurface excretion drives deep vertical transport of nanoplastics that subsequently accumulate in the drilosphere, i.e., burrow walls. Significant vertical transport of palladium-doped polystyrene nanoplastics (diameter 256 nm), traceable using elemental analysis, was observed and increased over 4 weeks. Nanoplastics were detected in depurated earthworms confirming their uptake without any detectable negative impact. Nanoplastics were indeed enriched in the drilosphere where cast material was visibly incorporated, and the reuse of initial burrows could be monitored via X-ray computed tomography. Moreover, the speed of nanoplastics transport to the deeper soil profile could not be explained with a local mixing model. Earthworms thus repeatedly ingested and excreted nanoplastics in the drilosphere calling for a more explicit inclusion of bioturbation in nanoplastic fate modeling under consideration of the dominant mechanism. Further investigation is required to quantify nanoplastic re-entrainment, such as during events of preferential flow in burrows.
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Affiliation(s)
- Wiebke
Mareile Heinze
- Department
of Soil and Environment, Swedish University
of Agricultural Sciences, Box 7014, 75007 Uppsala, Sweden
| | - Denise M. Mitrano
- Department
of Environmental Systems Science, ETH Zurich, Universitätsstrasse 16, 8092 Zürich, Switzerland
| | - Elma Lahive
- UK
Centre for Ecology and Hydrology, Benson Lane, Crowmarsh Gifford, Wallingford, OX10 8BB, United Kingdom
| | - John Koestel
- Department
of Soil and Environment, Swedish University
of Agricultural Sciences, Box 7014, 75007 Uppsala, Sweden
- Agroscope
− Standort Reckenholz, Soil Quality and Soil Use, Reckenholzstrasse 191, 8046 Zürich, Switzerland
| | - Geert Cornelis
- Department
of Soil and Environment, Swedish University
of Agricultural Sciences, Box 7014, 75007 Uppsala, Sweden
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36
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Warnke S, Ben Faleh A, Rizzo TR. Toward High-Throughput Cryogenic IR Fingerprinting of Mobility-Separated Glycan Isomers. ACS Meas Sci Au 2021; 1:157-164. [PMID: 34939078 PMCID: PMC8679095 DOI: 10.1021/acsmeasuresciau.1c00018] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Indexed: 05/10/2023]
Abstract
Infrared (IR) spectroscopy is a powerful tool used to infer detailed structural information on molecules, often in conjunction with quantum-chemical calculations. When applied to cryogenically cooled ions, IR spectra provide unique fingerprints that can be used for biomolecular identification. This is particularly important in the analysis of isomeric biopolymers, which are difficult to distinguish using mass spectrometry. However, IR spectroscopy typically requires laser systems that need substantial user attention and measurement times of tens of minutes, which limits its analytical utility. We report here the development of a new high-throughput instrument that combines ultrahigh-resolution ion-mobility spectrometry with cryogenic IR spectroscopy and mass spectrometry, and we apply it to the analysis of isomeric glycans. The ion mobility step, which is based on structures for lossless ion manipulations (SLIM), separates glycan isomers, and an IR fingerprint spectrum identifies them. An innovative cryogenic ion trap allows multiplexing the acquisition of analyte IR fingerprints following mobility separation, and using a turn-key IR laser, we can obtain spectra and identify isomeric species in less than a minute. This work demonstrates the potential of IR fingerprinting methods to impact the analysis of isomeric biomolecules and more specifically glycans.
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37
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Bechtold P, Wagner P, Hosch S, Siegrist D, Ruiz-Serrano A, Gregorini M, Mpina M, Ondó FA, Obama J, Ayekaba MO, Engler O, Stark WJ, Daubenberger CA, Schindler T. Rapid Identification of SARS-CoV-2 Variants of Concern Using a Portable peakPCR Platform. Anal Chem 2021; 93:16350-16359. [PMID: 34852455 PMCID: PMC8672427 DOI: 10.1021/acs.analchem.1c02368] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 09/29/2021] [Indexed: 11/29/2022]
Abstract
The need for tools that facilitate rapid detection and continuous monitoring of SARS-CoV-2 variants of concern (VOCs) is greater than ever, as these variants are more transmissible and therefore increase the pressure of COVID-19 on healthcare systems. To address this demand, we aimed at developing and evaluating a robust and fast diagnostic approach for the identification of SARS-CoV-2 VOC-associated spike gene mutations. Our diagnostic assays detect the E484K and N501Y single-nucleotide polymorphisms (SNPs) as well as a spike gene deletion (HV69/70) and can be run on standard laboratory equipment or on the portable rapid diagnostic technology platform peakPCR. The assays achieved excellent diagnostic performance when tested with RNA extracted from culture-derived SARS-CoV-2 VOC lineages and clinical samples collected in Equatorial Guinea, Central-West Africa. Simplicity of usage and the relatively low cost are advantages that make our approach well suitable for decentralized and rapid testing, especially in resource-limited settings.
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Affiliation(s)
- Philippe Bechtold
- Institute
for Chemical and Bioengineering, ETH Zurich, 8093 Zuerich, Switzerland
- Diaxxo
AG, 8093 Zuerich, Switzerland
| | - Philipp Wagner
- Swiss
Tropical and Public Health Institute, 4051 Basel, Switzerland
- University
of Basel, 4051 Basel, Switzerland
| | - Salome Hosch
- Swiss
Tropical and Public Health Institute, 4051 Basel, Switzerland
- University
of Basel, 4051 Basel, Switzerland
| | | | - Amalia Ruiz-Serrano
- Institute
for Chemical and Bioengineering, ETH Zurich, 8093 Zuerich, Switzerland
- Diaxxo
AG, 8093 Zuerich, Switzerland
| | - Michele Gregorini
- Institute
for Chemical and Bioengineering, ETH Zurich, 8093 Zuerich, Switzerland
- Diaxxo
AG, 8093 Zuerich, Switzerland
| | - Maxmillian Mpina
- Swiss
Tropical and Public Health Institute, 4051 Basel, Switzerland
- University
of Basel, 4051 Basel, Switzerland
- Laboratorio
de Investigaciones de Baney, P.O. Box 338, Baney, Equatorial
Guinea
| | | | - Justino Obama
- Ministry
of Health and Social Welfare, P.O. Box 209, Malabo, Equatorial
Guinea
| | | | | | - Wendelin J. Stark
- Institute
for Chemical and Bioengineering, ETH Zurich, 8093 Zuerich, Switzerland
- Diaxxo
AG, 8093 Zuerich, Switzerland
| | - Claudia A. Daubenberger
- Swiss
Tropical and Public Health Institute, 4051 Basel, Switzerland
- University
of Basel, 4051 Basel, Switzerland
| | - Tobias Schindler
- Swiss
Tropical and Public Health Institute, 4051 Basel, Switzerland
- University
of Basel, 4051 Basel, Switzerland
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38
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Kinik FP, Ortega-Guerrero A, Ebrahim FM, Ireland CP, Kadioglu O, Mace A, Asgari M, Smit B. Toward Optimal Photocatalytic Hydrogen Generation from Water Using Pyrene-Based Metal-Organic Frameworks. ACS Appl Mater Interfaces 2021; 13:57118-57131. [PMID: 34817166 PMCID: PMC8662633 DOI: 10.1021/acsami.1c16464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 11/12/2021] [Indexed: 05/15/2023]
Abstract
Metal-organic frameworks (MOFs) are promising materials for the photocatalytic H2 evolution reaction (HER) from water. To find the optimal MOF for a photocatalytic HER, one has to consider many different factors. For example, studies have emphasized the importance of light absorption capability, optical band gap, and band alignment. However, most of these studies have been carried out on very different materials. In this work, we present a combined experimental and computation study of the photocatalytic HER performance of a set of isostructural pyrene-based MOFs (M-TBAPy, where M = Sc, Al, Ti, and In). We systematically studied the effects of changing the metal in the node on the different factors that contribute to the HER rate (e.g., optical properties, the band structure, and water adsorption). In addition, for Sc-TBAPy, we also studied the effect of changes in the crystal morphology on the photocatalytic HER rate. We used this understanding to improve the photocatalytic HER efficiency of Sc-TBAPy, to exceed the one reported for Ti-TBAPy, in the presence of a co-catalyst.
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Affiliation(s)
- F. Pelin Kinik
- Laboratory
of Molecular Simulation (LSMO), Institut des Sciences et Ingénierie
Chimiques (ISIC), Ecole Polytechnique Fédérale
de Lausanne (EPFL), Rue de l’Industrie 17, Sion CH-1951, Valais, Switzerland
| | - Andres Ortega-Guerrero
- Laboratory
of Molecular Simulation (LSMO), Institut des Sciences et Ingénierie
Chimiques (ISIC), Ecole Polytechnique Fédérale
de Lausanne (EPFL), Rue de l’Industrie 17, Sion CH-1951, Valais, Switzerland
| | - Fatmah Mish Ebrahim
- Laboratory
of Molecular Simulation (LSMO), Institut des Sciences et Ingénierie
Chimiques (ISIC), Ecole Polytechnique Fédérale
de Lausanne (EPFL), Rue de l’Industrie 17, Sion CH-1951, Valais, Switzerland
| | - Christopher P. Ireland
- Laboratory
of Molecular Simulation (LSMO), Institut des Sciences et Ingénierie
Chimiques (ISIC), Ecole Polytechnique Fédérale
de Lausanne (EPFL), Rue de l’Industrie 17, Sion CH-1951, Valais, Switzerland
| | - Ozge Kadioglu
- Laboratory
of Molecular Simulation (LSMO), Institut des Sciences et Ingénierie
Chimiques (ISIC), Ecole Polytechnique Fédérale
de Lausanne (EPFL), Rue de l’Industrie 17, Sion CH-1951, Valais, Switzerland
| | - Amber Mace
- Department
of Chemistry—Ångström Laboratory, Uppsala University, Uppsala SE-751 21, Sweden
| | - Mehrdad Asgari
- Laboratory
of Molecular Simulation (LSMO), Institut des Sciences et Ingénierie
Chimiques (ISIC), Ecole Polytechnique Fédérale
de Lausanne (EPFL), Rue de l’Industrie 17, Sion CH-1951, Valais, Switzerland
| | - Berend Smit
- Laboratory
of Molecular Simulation (LSMO), Institut des Sciences et Ingénierie
Chimiques (ISIC), Ecole Polytechnique Fédérale
de Lausanne (EPFL), Rue de l’Industrie 17, Sion CH-1951, Valais, Switzerland
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39
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Abstract
The formation of so-called solar fuels from abundant low-energetic compounds, such as carbon dioxide or water, relies on the chemical elementary steps of photoinduced electron transfer and accumulation of multiple redox equivalents. The majority of molecular systems explored to date require sacrificial electron donors to accumulate multiple electrons on a single acceptor unit, but the use of high-energetic sacrificial redox reagents is unsustainable. In recent years, an increasing number of molecular compounds for reversible light-driven accumulation of redox equivalents that do not need sacrificial electron donors has been reported. Those compounds are the focus of this mini review. Different concepts, such as redox potential compression (achieved by proton-coupled electron transfer, Lewis acid-base interactions, or structural rearrangements), hybrids with inorganic nanoparticles, and diffusion-controlled multi-component systems, will be discussed. Newly developed strategies to outcompete unproductive reaction pathways in favor of desired photoproduct formation will be compared, and the importance of identifying reaction intermediates in the course of multiphotonic excitation by different time-resolved spectroscopic techniques will be discussed. The mechanistic insights gained from molecular donor-photosensitizer-acceptor compounds inform the design of next-generation charge accumulation systems for solar energy conversion.
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40
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Severa G, Bruffey E, Nguyen PQH, Gigante A, Leick N, Kelly C, Finkelstein GJ, Hagemann H, Gennett T, Rocheleau RE, Dera P. Fe 4(OAc) 10[EMIM] 2: Novel Iron-Based Acetate EMIM Ionic Compound. ACS Omega 2021; 6:31907-31918. [PMID: 34870013 PMCID: PMC8637965 DOI: 10.1021/acsomega.1c04670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 10/25/2021] [Indexed: 06/13/2023]
Abstract
We synthesized and characterized a novel iron(II) aceto EMIM coordination compound, which has a simplified empirical formula Fe4(OAc)10[EMIM]2, in two different hydration forms: as anhydrous monoclinic compound and triclinic dihydrate Fe4(OAc)10[EMIM]2·2H2O. The dihydrate compound is isostructural with recently reported Mn4(OAc)10[EMIM]2·2H2O, while the anhydrate is a superstructure of the Mn counterpart, suggesting the existence of solid solutions. Both new Fe compounds contain chains of Fe2+ octahedrally coordinated exclusively by acetate groups. The EMIM moieties do not interact directly with the Fe2+ and contribute to the structural framework of the compound through van der Waals forces and C-H···O hydrogen bonds with the acetate anions. The compounds have a melting temperature of ∼94 °C; therefore, they can be considered metal-containing ionic liquids. Differential thermal analysis indicates three endothermic transitions associated with melting, structural rearrangement in the molten state at about 157 °C, and finally, thermal decomposition of the Fe4(OAc)10[EMIM]2. Thermogravimetric analyses indicate an ∼72 wt % mass loss during the decomposition at 280-325 °C. The Fe4(OAc)10[EMIM]2 compounds have higher thermal stability than their Mn counterparts and [EMIM][OAc] but lower compared to iron(II) acetate. Temperature-programmed desorption coupled with mass spectrometry shows that the decomposition pathway of the Fe4(OAc)10[EMIM]2 involves four distinct regimes with peak temperatures at 88, 200, 267, and 345 °C. The main species observed in the decomposition of the compound are CH3, H2O, N2, CO, OC-CH3, OH-CO, H3C-CO-CH3, and H3C-O-CO-CH3. Variable-temperature infrared vibrational spectroscopy indicates that the phase transition at 160-180 °C is associated with a reorientation of the acetate ions, which may lead to a lower interaction with the [EMIM]+ before the decomposition of the Fe4(OAc)10[EMIM]2 upon further heating. The Fe4(OAc)10[EMIM]2 compounds are porous, plausibly capable of accommodating other types of molecules.
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Affiliation(s)
- Godwin Severa
- Hawai’i
Natural Energy Institute, University of
Hawai’i at Ma̅noa, 1680 East West Road, POST 109, Honolulu, Hawaii 96822, United States
| | - Edward Bruffey
- Hawai’i
Natural Energy Institute, University of
Hawai’i at Ma̅noa, 1680 East West Road, POST 109, Honolulu, Hawaii 96822, United States
| | - Phuong Q. H. Nguyen
- Hawai’i
Institute of Geophysics and Planetology, University of Hawai’i at Ma̅noa, 1680 East West Road, POST 109, Honolulu, Hawaii 96822, United States
| | - Angelina Gigante
- Département
de Chimie Physique, Université de
Genève, 30, quai E. Ansermet, 1211 Geneva 4, Switzerland
| | - Noemi Leick
- National
Renewable Energy Laboratory (NREL), Colorado, Colorado 80401, United States
| | - Colleen Kelly
- Hawai’i
Natural Energy Institute, University of
Hawai’i at Ma̅noa, 1680 East West Road, POST 109, Honolulu, Hawaii 96822, United States
| | - Gregory J. Finkelstein
- Hawai’i
Institute of Geophysics and Planetology, University of Hawai’i at Ma̅noa, 1680 East West Road, POST 109, Honolulu, Hawaii 96822, United States
| | - Hans Hagemann
- Département
de Chimie Physique, Université de
Genève, 30, quai E. Ansermet, 1211 Geneva 4, Switzerland
| | - Thomas Gennett
- National
Renewable Energy Laboratory (NREL), Colorado, Colorado 80401, United States
- Chemistry
Department, Colorado School of Mines, 1012 14th Street, Golden, Colorado 80401, United States
| | - Richard E. Rocheleau
- Hawai’i
Natural Energy Institute, University of
Hawai’i at Ma̅noa, 1680 East West Road, POST 109, Honolulu, Hawaii 96822, United States
| | - Przemyslaw Dera
- Hawai’i
Institute of Geophysics and Planetology, University of Hawai’i at Ma̅noa, 1680 East West Road, POST 109, Honolulu, Hawaii 96822, United States
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41
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Stein A, Chen D, Igareta NV, Cotelle Y, Rebelein JG, Ward TR. A Dual Anchoring Strategy for the Directed Evolution of Improved Artificial Transfer Hydrogenases Based on Carbonic Anhydrase. ACS Cent Sci 2021; 7:1874-1884. [PMID: 34849402 PMCID: PMC8620556 DOI: 10.1021/acscentsci.1c00825] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Indexed: 06/13/2023]
Abstract
Artificial metalloenzymes result from anchoring a metal cofactor within a host protein. Such hybrid catalysts combine the selectivity and specificity of enzymes with the versatility of (abiotic) transition metals to catalyze new-to-nature reactions in an evolvable scaffold. With the aim of improving the localization of an arylsulfonamide-bearing iridium-pianostool catalyst within human carbonic anhydrase II (hCAII) for the enantioselective reduction of prochiral imines, we introduced a covalent linkage between the host and the guest. Herein, we show that a judiciously positioned cysteine residue reacts with a p-nitropicolinamide ligand bound to iridium to afford an additional sulfonamide covalent linkage. Three rounds of directed evolution, performed on the dually anchored cofactor, led to improved activity and selectivity for the enantioselective reduction of harmaline (up to 97% ee (R) and >350 turnovers on a preparative scale). To evaluate the substrate scope, the best hits of each generation were tested with eight substrates. X-ray analysis, carried out at various stages of the evolutionary trajectory, was used to scrutinize (i) the nature of the covalent linkage between the cofactor and the host as well as (ii) the remodeling of the substrate-binding pocket.
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Affiliation(s)
- Alina Stein
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
- National
Center of Competence in Research “Molecular Systems Engineering”, 4058 Basel, Switzerland
| | - Dongping Chen
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
- National
Center of Competence in Research “Molecular Systems Engineering”, 4058 Basel, Switzerland
| | - Nico V. Igareta
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
- National
Center of Competence in Research “Molecular Systems Engineering”, 4058 Basel, Switzerland
| | - Yoann Cotelle
- Aix-Marseille
Université, CNRS, Centrale Marseille, iSm2, 13284 Marseille, France
| | - Johannes G. Rebelein
- Max
Planck Institute for Terrestrial Microbiology, Karl-von-Frisch-Strasse 10, D-35043 Marburg, Germany
| | - Thomas R. Ward
- Department
of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland
- National
Center of Competence in Research “Molecular Systems Engineering”, 4058 Basel, Switzerland
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42
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Leitao S, Drake B, Pinjusic K, Pierrat X, Navikas V, Nievergelt AP, Brillard C, Djekic D, Radenovic A, Persat A, Constam DB, Anders J, Fantner GE. Time-Resolved Scanning Ion Conductance Microscopy for Three-Dimensional Tracking of Nanoscale Cell Surface Dynamics. ACS Nano 2021; 15:17613-17622. [PMID: 34751034 PMCID: PMC8613909 DOI: 10.1021/acsnano.1c05202] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Nanocharacterization plays a vital role in understanding the complex nanoscale organization of cells and organelles. Understanding cellular function requires high-resolution information about how the cellular structures evolve over time. A number of techniques exist to resolve static nanoscale structure of cells in great detail (super-resolution optical microscopy, EM, AFM). However, time-resolved imaging techniques tend to either have a lower resolution, are limited to small areas, or cause damage to the cells, thereby preventing long-term time-lapse studies. Scanning probe microscopy methods such as atomic force microscopy (AFM) combine high-resolution imaging with the ability to image living cells in physiological conditions. The mechanical contact between the tip and the sample, however, deforms the cell surface, disturbs the native state, and prohibits long-term time-lapse imaging. Here, we develop a scanning ion conductance microscope (SICM) for high-speed and long-term nanoscale imaging of eukaryotic cells. By utilizing advances in nanopositioning, nanopore fabrication, microelectronics, and controls engineering, we developed a microscopy method that can resolve spatiotemporally diverse three-dimensional (3D) processes on the cell membrane at sub-5-nm axial resolution. We tracked dynamic changes in live cell morphology with nanometer details and temporal ranges of subsecond to days, imaging diverse processes ranging from endocytosis, micropinocytosis, and mitosis to bacterial infection and cell differentiation in cancer cells. This technique enables a detailed look at membrane events and may offer insights into cell-cell interactions for infection, immunology, and cancer research.
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Affiliation(s)
- Samuel
M. Leitao
- Laboratory
for Bio- and Nano-Instrumentation, Institute of Bioengineering, School
of Engineering, Swiss Federal Institute
of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Barney Drake
- Laboratory
for Bio- and Nano-Instrumentation, Institute of Bioengineering, School
of Engineering, Swiss Federal Institute
of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Katarina Pinjusic
- Laboratory
of Developmental and Cancer Cell Biology, Institute for Experimental
Cancer Research, School of Life Sciences, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Xavier Pierrat
- Laboratory
of Microbial Mechanics, Institute of Bioengineering and Global Health,
School of Life Sciences, Swiss Federal Institute
of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Vytautas Navikas
- Laboratory
of Nanoscale Biology, Institute of Bioengineering, School of Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Adrian P. Nievergelt
- Laboratory
for Bio- and Nano-Instrumentation, Institute of Bioengineering, School
of Engineering, Swiss Federal Institute
of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Charlène Brillard
- Laboratory
for Bio- and Nano-Instrumentation, Institute of Bioengineering, School
of Engineering, Swiss Federal Institute
of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Denis Djekic
- Institute
of Smart Sensors, Universität Stuttgart, Stuttgart 70049, Germany
| | - Aleksandra Radenovic
- Laboratory
of Nanoscale Biology, Institute of Bioengineering, School of Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Alexandre Persat
- Laboratory
of Microbial Mechanics, Institute of Bioengineering and Global Health,
School of Life Sciences, Swiss Federal Institute
of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Daniel B. Constam
- Laboratory
of Developmental and Cancer Cell Biology, Institute for Experimental
Cancer Research, School of Life Sciences, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Jens Anders
- Institute
of Smart Sensors, Universität Stuttgart, Stuttgart 70049, Germany
| | - Georg E. Fantner
- Laboratory
for Bio- and Nano-Instrumentation, Institute of Bioengineering, School
of Engineering, Swiss Federal Institute
of Technology Lausanne (EPFL), Lausanne 1015, Switzerland
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43
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Wang Z, Cheon CY, Tripathi M, Marega GM, Zhao Y, Ji HG, Macha M, Radenovic A, Kis A. Superconducting 2D NbS 2 Grown Epitaxially by Chemical Vapor Deposition. ACS Nano 2021; 15:18403-18410. [PMID: 34756018 PMCID: PMC8614232 DOI: 10.1021/acsnano.1c07956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 11/03/2021] [Indexed: 06/13/2023]
Abstract
Metallic two-dimensional (2D) transition metal dichalcogenides (TMDCs) are attracting great attention because of their interesting low-temperature properties such as superconductivity, magnetism, and charge density waves (CDW). However, further studies and practical applications are being slowed down by difficulties in synthesizing high-quality materials with a large grain size and well-determined thickness. In this work, we demonstrate epitaxial chemical vapor deposition (CVD) growth of 2D NbS2 crystals on a sapphire substrate, with a thickness-dependent structural phase transition. NbS2 crystals are epitaxially aligned by the underlying c-plane sapphire resulting in high-quality growth. The thickness of NbS2 is well controlled by growth parameters to be between 1.5 and 10 nm with a large grain size of up to 500 μm. As the thickness increases, we observe in our NbS2 a transition from a metallic 3R-polytype to a superconducting 2H-polytype, confirmed by Raman spectroscopy, aberration-corrected scanning transmission electron microscopy (STEM) and electrical transport measurements. A Berezinskii-Kosterlitz-Thouless (BKT) superconducting transition occurs in the CVD-grown 2H-phase NbS2 below the transition temperature (Tc) of 3 K. Our work demonstrates thickness and phase-controllable synthesis of high-quality superconducting 2D NbS2, which is imperative for its practical applications in next-generation TMDC-based electrical devices.
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Affiliation(s)
- Zhenyu Wang
- Institute
of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Institute
of Materials Science and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Cheol-Yeon Cheon
- Institute
of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Institute
of Materials Science and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Mukesh Tripathi
- Institute
of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Institute
of Materials Science and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Guilherme Migliato Marega
- Institute
of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Institute
of Materials Science and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Yanfei Zhao
- Institute
of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Institute
of Materials Science and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Hyun Goo Ji
- Institute
of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Institute
of Materials Science and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Michal Macha
- Institute
of Bioengineering, École Polytechnique
Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Aleksandra Radenovic
- Institute
of Bioengineering, École Polytechnique
Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Andras Kis
- Institute
of Electrical and Microengineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
- Institute
of Materials Science and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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44
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Calcabrini M, Van den Eynden D, Ribot SS, Pokratath R, Llorca J, De Roo J, Ibáñez M. Ligand Conversion in Nanocrystal Synthesis: The Oxidation of Alkylamines to Fatty Acids by Nitrate. JACS Au 2021; 1:1898-1903. [PMID: 35574040 PMCID: PMC8611721 DOI: 10.1021/jacsau.1c00349] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Indexed: 05/13/2023]
Abstract
Ligands are a fundamental part of nanocrystals. They control and direct nanocrystal syntheses and provide colloidal stability. Bound ligands also affect the nanocrystals' chemical reactivity and electronic structure. Surface chemistry is thus crucial to understand nanocrystal properties and functionality. Here, we investigate the synthesis of metal oxide nanocrystals (CeO2-x , ZnO, and NiO) from metal nitrate precursors, in the presence of oleylamine ligands. Surprisingly, the nanocrystals are capped exclusively with a fatty acid instead of oleylamine. Analysis of the reaction mixtures with nuclear magnetic resonance spectroscopy revealed several reaction byproducts and intermediates that are common to the decomposition of Ce, Zn, Ni, and Zr nitrate precursors. Our evidence supports the oxidation of alkylamine and formation of a carboxylic acid, thus unraveling this counterintuitive surface chemistry.
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Affiliation(s)
| | | | | | - Rohan Pokratath
- Department
of Chemistry, University of Basel, 4058 Basel, Switzerland
| | - Jordi Llorca
- Institute
of Energy Technologies, Department of Chemical Engineering and Barcelona
Research Center in Multiscale Science and Engineering, Universitat Politecnica de Catalunya, 08019 Barcelona, Spain
| | - Jonathan De Roo
- Department
of Chemistry, University of Basel, 4058 Basel, Switzerland
| | - Maria Ibáñez
- IST
Austria, Am Campus 1, 3400 Klosterneuburg, Austria
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45
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Pfeuffer-Rooschüz J, Schmid L, Prescimone A, Tiefenbacher K. Xanthene[ n]arenes: Exceptionally Large, Bowl-Shaped Macrocyclic Building Blocks Suitable for Self-Assembly. JACS Au 2021; 1:1885-1891. [PMID: 34841407 PMCID: PMC8611668 DOI: 10.1021/jacsau.1c00343] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Indexed: 05/05/2023]
Abstract
A new class of macrocycles denoted as "xanthene[n]arenes" was synthesized. In contrast to most other macrocycles, they feature a conformationally restricted bowl shape due to the attached alkyl groups at the linking methylene units. This facilitates the synthesis of cavitands and the self-assembly to molecular capsules via noncovalent interactions. The derivatization potential of the novel macrocycles was demonstrated on the xanthene[3]arene scaffold. Besides a deep cavitand and an oxygen-embedded zigzag hydrocarbon belt[12]arene, a modified macrocycle was synthesized that self-assembles into a hydrogen-bonded tetrameric capsule, demonstrating the potential of xanthene[n]arenes as a new set of macrocyclic building blocks.
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Affiliation(s)
| | - Lucius Schmid
- Department
of Chemistry, University of Basel, Mattenstrasse 24a, CH-4058 Basel, Switzerland
| | - Alessandro Prescimone
- Department
of Chemistry, University of Basel, Mattenstrasse 24a, CH-4058 Basel, Switzerland
| | - Konrad Tiefenbacher
- Department
of Chemistry, University of Basel, Mattenstrasse 24a, CH-4058 Basel, Switzerland
- Department
of Biosystems Science and Engineering, ETH
Zürich, Mattenstrasse
26, CH-4058 Basel, Switzerland
- or
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46
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Abstract
Precious and rare elements have traditionally dominated inorganic photophysics and photochemistry, but now we are witnessing a paradigm shift toward cheaper and more abundant metals. Even though emissive complexes based on selected first-row transition metals have long been known, recent conceptual breakthroughs revealed that a much broader range of elements in different oxidation states are useable for this purpose. Coordination compounds of V, Cr, Mn, Fe, Co, Ni, and Cu now show electronically excited states with unexpected reactivity and photoluminescence behavior. Aside from providing a compact survey of the recent conceptual key advances in this dynamic field, our Perspective identifies the main design strategies that enabled the discovery of fundamentally new types of 3d-metal-based luminophores and photosensitizers operating in solution at room temperature.
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47
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Chen S, Artiglia L, Orlando F, Edebeli J, Kong X, Yang H, Boucly A, Corral Arroyo P, Prisle N, Ammann M. Impact of Tetrabutylammonium on the Oxidation of Bromide by Ozone. ACS Earth Space Chem 2021; 5:3008-3021. [PMID: 34825122 PMCID: PMC8607506 DOI: 10.1021/acsearthspacechem.1c00233] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 10/01/2021] [Accepted: 10/09/2021] [Indexed: 06/13/2023]
Abstract
The reaction of ozone with sea-salt derived bromide is relevant for marine boundary layer atmospheric chemistry. The oxidation of bromide by ozone is enhanced at aqueous interfaces. Ocean surface water and sea spray aerosol are enriched in organic compounds, which may also have a significant effect on this reaction at the interface. Here, we assess the surface propensity of cationic tetrabutylammonium at the aqueous liquid-vapor interface by liquid microjet X-ray photoelectron spectroscopy (XPS) and the effect of this surfactant on ozone uptake to aqueous bromide solutions. The results clearly indicate that the positively charged nitrogen group in tetrabutylammonium (TBA), along with its surface activity, leads to an enhanced interfacial concentration of both bromide and the bromide ozonide reaction intermediate. In parallel, off-line kinetic experiments for the same system demonstrate a strongly enhanced ozone loss rate in the presence of TBA, which is attributed to an enhanced surface reaction rate. We used liquid jet XPS to obtain detailed chemical composition information from the aqueous-solution-vapor interface of mixed aqueous solutions containing bromide or bromide and chloride with and without TBA surfactant. Core level spectra of Br 3d, C 1s, Cl 2p, N 1s, and O 1s were used for this comparison. A model was developed to account for the attenuation of photoelectrons by the carbon-rich layer established by the TBA surfactant. We observed that the interfacial density of bromide is increased by an order of magnitude in solutions with TBA. The salting-out of TBA in the presence of 0.55 M sodium chloride is apparent. The increased interfacial bromide density can be rationalized by the association constants for bromide and chloride to form ion-pairs with TBA. Still, the interfacial reactivity is not increasing simply proportionally with the increasing interfacial bromide concentration in response to the presence of TBA. The steady state concentration of the bromide ozonide intermediate increases by a smaller degree, and the lifetime of the intermediate is 1 order of magnitude longer in the presence of TBA. Thus, the influence of cationic surfactants on the reactivity of bromide depends on the details of the complex environment at the interface.
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Affiliation(s)
- Shuzhen Chen
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
- Institute
of Atmospheric and Climate Sciences, ETH
Zürich, 8006 Zürich, Switzerland
| | - Luca Artiglia
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Fabrizio Orlando
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Jacinta Edebeli
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
- Institute
of Atmospheric and Climate Sciences, ETH
Zürich, 8006 Zürich, Switzerland
| | - Xiangrui Kong
- Center
for Atmospheric Research, University of
Oulu, P.O. Box 4500, 90014 Oulu, Finland
| | - Huanyu Yang
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
- Institute
of Atmospheric and Climate Sciences, ETH
Zürich, 8006 Zürich, Switzerland
| | - Anthony Boucly
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Pablo Corral Arroyo
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Nønne Prisle
- Center
for Atmospheric Research, University of
Oulu, P.O. Box 4500, 90014 Oulu, Finland
| | - Markus Ammann
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
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48
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Billeter E, Łodziana Z, Borgschulte A. Surface Properties of the Hydrogen-Titanium System. J Phys Chem C Nanomater Interfaces 2021; 125:25339-25349. [PMID: 34824662 PMCID: PMC8607499 DOI: 10.1021/acs.jpcc.1c08635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 10/12/2021] [Indexed: 06/13/2023]
Abstract
Titanium is an excellent getter material, catalyzes gas-solid reactions such as hydrogen absorption in lightweight metal hydrides and complex metal hydrides and has recently been shown as a potential ammonia synthesis catalyst. However, knowledge of the surface properties of this metal is limited when it absorbs large quantities of hydrogen at operation conditions. Both the conceptual description of such a surface as well as the experimental determination of surface hydrogen concentration on hydride-forming metals is challenging due to the dynamic bulk properties and the incompatibility of traditional surface science methods with the hydrogen pressure needed to form the metal hydride, respectively. In this paper, the surface pressure-composition isotherms of the titanium-hydrogen system are measured by operando reflecting electron energy loss spectroscopy (REELS). The titanium thin films were deposited on and hydrogenated through a palladium membrane, which provides an atomic hydrogen source under ultrahigh vacuum conditions. The measurements are supported by density functional theory calculations providing a complete picture of the hydrogen-deficient surface of TiH2 being the basis of its high catalytic activity.
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Affiliation(s)
- Emanuel Billeter
- Laboratory
for Advanced Analytical Technologies, Empa—Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
- Department
of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
| | - Zbigniew Łodziana
- Institute
of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow, Poland
| | - Andreas Borgschulte
- Laboratory
for Advanced Analytical Technologies, Empa—Swiss
Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
- Department
of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
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49
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Bischoff M, Biriukov D, Předota M, Marchioro A. Second Harmonic Scattering Reveals Ion-Specific Effects at the SiO 2 and TiO 2 Nanoparticle/Aqueous Interface. J Phys Chem C Nanomater Interfaces 2021; 125:25261-25274. [PMID: 35591899 PMCID: PMC9109693 DOI: 10.1021/acs.jpcc.1c07191] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 10/12/2021] [Indexed: 06/01/2023]
Abstract
Ion-specific effects play a crucial role in controlling the stability of colloidal systems and regulating interfacial processes. Although mechanistic pictures have been developed to explain the electrostatic structure of solid/water colloidal interfaces, ion-specific effects remain poorly understood. Here we quantify the average interfacial water orientation and the electrostatic surface potential around 100 nm SiO2 and TiO2 colloidal particles in the presence of NaCl, RbCl, and CaCl2 using polarimetric angle-resolved second harmonic scattering. We show that these two parameters can be used to establish the ion adsorption mechanism in a low ionic strength regime (<1 mM added salt). The relative differences between salts as a function of the ionic strength demonstrate cation- and surface-specific preferences for inner- vs outer-sphere adsorption. Compared to monovalent Rb+ and Na+, Ca2+ is found to be preferentially adsorbed as outer-sphere on SiO2 surfaces, while a dominant inner-sphere adsorption is observed for Ca2+ on TiO2. Molecular dynamics simulations performed on crystalline SiO2 and TiO2 surfaces support the experimental conclusions. This work contributes to the understanding of the electrostatic environment around colloidal nanoparticles on a molecular level by providing insight into ion-specific effects with micromolar sensitivity.
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Affiliation(s)
- Marie Bischoff
- Laboratory
for fundamental BioPhotonics (LBP), Institute of Bioengineering (IBI),
and Institute of Materials Science (IMX), School of Engineering (STI), École Polytechnique Fédérale
de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Denys Biriukov
- Institute
of Organic Chemistry and Biochemistry, Czech
Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
- Department
of Physics, Faculty of Science, University
of South Bohemia, Branišovská 1760, 370
05 České Budějovice, Czech Republic
| | - Milan Předota
- Department
of Physics, Faculty of Science, University
of South Bohemia, Branišovská 1760, 370
05 České Budějovice, Czech Republic
| | - Arianna Marchioro
- Laboratory
for fundamental BioPhotonics (LBP), Institute of Bioengineering (IBI),
and Institute of Materials Science (IMX), School of Engineering (STI), École Polytechnique Fédérale
de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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50
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Morad V, McCall KM, Sakhatskyi K, Lehmann E, Walfort B, Losko AS, Trtik P, Strobl M, Yakunin S, Kovalenko MV. Luminescent Lead Halide Ionic Liquids for High-Spatial-Resolution Fast Neutron Imaging. ACS Photonics 2021; 8:3357-3364. [PMID: 34820475 PMCID: PMC8603383 DOI: 10.1021/acsphotonics.1c01348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Indexed: 05/12/2023]
Abstract
The fast neutron imaging technique with recoil proton detection harbors significant potential for imaging of thick, large-scale objects containing high-Z elements. However, the challenge to find efficient fast neutron scintillators with high spatial resolution is ongoing. The list of requirements for such scintillators is long and demanding: a proton-rich, scattering-free material combining high light yield with the absence of light reabsorption. To meet these challenges, we look for a suitable material among a rising class of 0D organic-inorganic Pb(II) halide hybrids. The use of large organic cations, e.g., trihexyltetradecylphosphonium, results in room-temperature ionic liquids that combine highly Stokes-shifted (up to 1.7 eV), reabsorption-free, and efficient emission (photoluminescence quantum yield up to 60%) from molecularly small and dense (PbX2 molar fraction up to 0.33) emitting centers. We investigate the optical properties of the resulting ionic liquids and showcase their utility as fast neutron imaging scintillators. Concomitantly with good light yield, such fast-neutron scintillators exhibit both higher spatial resolution and lower γ-ray sensitivity compared with commercial ZnS:Cu-based screens.
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Affiliation(s)
- Viktoriia Morad
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa −
Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Kyle M. McCall
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa −
Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Kostiantyn Sakhatskyi
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa −
Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | | | | | - Adrian S. Losko
- Forschungs-Neutronenquelle
Heinz Maier-Leibnitz, 85748 Garching, Germany
| | - Pavel Trtik
- Paul
Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Markus Strobl
- Paul
Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Sergii Yakunin
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa −
Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
| | - Maksym V. Kovalenko
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland
- Laboratory
for Thin Films and Photovoltaics, Empa −
Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
- E-mail:
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