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Çiçek Özkul SL, Kaba İ, Ozdemir Olgun FA. Unravelling the potential of magnetic nanoparticles: a comprehensive review of design and applications in analytical chemistry. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:3620-3640. [PMID: 38814019 DOI: 10.1039/d4ay00206g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2024]
Abstract
The study of nanoparticles has emerged as a prominent research field, offering a wide range of applications across various disciplines. With their unique physical and chemical properties within the size range of 1-100 nm, nanoparticles have garnered significant attention. Among them, magnetic nanoparticles (MNPs) exemplify promising super-magnetic characteristics, especially in the 10-20 nm size range, making them ideal for swift responses to applied magnetic fields. In this comprehensive review, we focus on MNPs suitable for analytical purposes. We investigate and classify them based on their analytical applications, synthesis routes, and overall utility, providing a detailed literature summary. By exploring a diverse range of MNPs, this review offers valuable insights into their potential application in various analytical scenarios.
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Affiliation(s)
- Serra Lale Çiçek Özkul
- Istanbul Technical University, Faculty of Science and Letters, Department of Chemistry, Maslak Campus, Sariyer, Istanbul, Turkey
| | - İbrahim Kaba
- Marmara University, Faculty of Engineering, Department of Chemical Engineering, Maltepe, Istanbul, Turkey
| | - Fatos Ayca Ozdemir Olgun
- Istanbul Health and Technology University, Faculty of Engineering and Natural Sciences, Department of Chemical Engineering, Sutluce, Beyoglu, Istanbul, Turkey.
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2
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Kwon H, Yang Y, Kim G, Gim D, Ha M. Anisotropy in magnetic materials for sensors and actuators in soft robotic systems. NANOSCALE 2024; 16:6778-6819. [PMID: 38502047 DOI: 10.1039/d3nr05737b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
The field of soft intelligent robots has rapidly developed, revealing extensive potential of these robots for real-world applications. By mimicking the dexterities of organisms, robots can handle delicate objects, access remote areas, and provide valuable feedback on their interactions with different environments. For autonomous manipulation of soft robots, which exhibit nonlinear behaviors and infinite degrees of freedom in transformation, innovative control systems integrating flexible and highly compliant sensors should be developed. Accordingly, sensor-actuator feedback systems are a key strategy for precisely controlling robotic motions. The introduction of material magnetism into soft robotics offers significant advantages in the remote manipulation of robotic operations, including touch or touchless detection of dynamically changing shapes and positions resulting from the actuations of robots. Notably, the anisotropies in the magnetic nanomaterials facilitate the perception and response with highly selective, directional, and efficient ways used for both sensors and actuators. Accordingly, this review provides a comprehensive understanding of the origins of magnetic anisotropy from both intrinsic and extrinsic factors and summarizes diverse magnetic materials with enhanced anisotropy. Recent developments in the design of flexible sensors and soft actuators based on the principle of magnetic anisotropy are outlined, specifically focusing on their applicabilities in soft robotic systems. Finally, this review addresses current challenges in the integration of sensors and actuators into soft robots and offers promising solutions that will enable the advancement of intelligent soft robots capable of efficiently executing complex tasks relevant to our daily lives.
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Affiliation(s)
- Hyeokju Kwon
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| | - Yeonhee Yang
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| | - Geonsu Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| | - Dongyeong Gim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
| | - Minjeong Ha
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
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3
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Vensaus P, Liang Y, Zigon N, Avarvari N, Mujica V, Soler-Illia GJAA, Lingenfelder M. Hybrid mesoporous electrodes evidence CISS effect on water oxidation. J Chem Phys 2024; 160:111103. [PMID: 38511663 DOI: 10.1063/5.0199339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Accepted: 03/05/2024] [Indexed: 03/22/2024] Open
Abstract
Controlling product selectivity is essential for improving the efficiency of multi-product reactions. Electrochemical water oxidation is a reaction of main importance in different applications, e.g., renewable energy schemes and environmental protection, where H2O2 and O2 are the two principal products. In this Communication, the product selectivity of electrochemical water oxidation was controlled by making use of the chiral induced spin selectivity (CISS) effect at mesoporous-TiO2 on the molecule-modified Au substrate. Our results show a decrease in H2O2 formation when using chiral hetero-helicene molecules adsorbed on the Au substrate. We propose a mechanism for this kinetic effect based on the onset of CISS-induced spin polarization on the Au-helicene chiral interface. We also present a new tunable substrate to investigate the CISS mechanism.
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Affiliation(s)
- Priscila Vensaus
- Max Planck-EPFL Laboratory for Molecular Nanoscience and Technology, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
- Instituto de Nanosistemas, Escuela de Bio y Nanotecnologías, Universidad Nacional de San Martín, San Martín B1650, Buenos Aires, Argentina
| | - Yunchang Liang
- Max Planck-EPFL Laboratory for Molecular Nanoscience and Technology, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Nicolas Zigon
- Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, F-49000 Angers, France
| | - Narcis Avarvari
- Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, F-49000 Angers, France
| | - Vladimiro Mujica
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, USA
| | - Galo J A A Soler-Illia
- Instituto de Nanosistemas, Escuela de Bio y Nanotecnologías, Universidad Nacional de San Martín, San Martín B1650, Buenos Aires, Argentina
| | - Magalí Lingenfelder
- Max Planck-EPFL Laboratory for Molecular Nanoscience and Technology, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
- Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
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Tie M, Colford S, Niewczas M, Baumbach R, Dhirani AA. Widely Varying Kondo and Magnetic Interactions in Molecule Gold Nanostructured Materials by Changing the Gold Nanoarchitecture. NANO LETTERS 2023; 23:3724-3730. [PMID: 37115852 DOI: 10.1021/acs.nanolett.2c04918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Delocalized-localized electron interactions are central to strongly correlated electron phenomena. Here, we study the Kondo effect, a prototypical strongly correlated phenomena, in a tunable fashion using gold nanostructures (nanoparticle, NP, and nanoshell, NS) + molecule cross-linkers (butanedithiol, BDT). NP films exhibit hallmark signatures of the Kondo effect, including (1) a log temperature resistance upturn as temperature decreases in a metallic regime, and (2) zero-bias conductance peaks (ZBCPs) that are well fit by a Frota function near a percolation insulator transition, previously used to model Kondo peaks observed using tunnel junctions. Remarkably, NP + NS films exhibit ZBCPs that persist to >220 K, i.e., >10-fold higher than that in NP films. Magnetic measurements reveal that moments in NP powders align, and in NS powders, they antialign at low temperatures. Based on these observations, we propose a mechanism in which varying such material nanobuilding blocks can modify electron-electron interactions to such a large degree.
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Affiliation(s)
- Monique Tie
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Sean Colford
- Department of Physics, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Marek Niewczas
- Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario L8S 4L7, Canada
| | - Ryan Baumbach
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Al-Amin Dhirani
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
- Department of Physics, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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Chinnabathini VC, Dingenen F, Borah R, Abbas I, van der Tol J, Zarkua Z, D'Acapito F, Nguyen THT, Lievens P, Grandjean D, Verbruggen SW, Janssens E. Gas phase deposition of well-defined bimetallic gold-silver clusters for photocatalytic applications. NANOSCALE 2023; 15:6696-6708. [PMID: 36938628 DOI: 10.1039/d2nr07287d] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Cluster beam deposition is employed for fabricating well-defined bimetallic plasmonic photocatalysts to enhance their activity while facilitating a more fundamental understanding of their properties. AuxAg1-x clusters with compositions (x = 0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1) spanning the metals' miscibility range were produced in the gas-phase and soft-landed on TiO2 P25-coated silicon wafers with an optimal coverage of 4 atomic monolayer equivalents. Electron microscopy images show that at this coverage most clusters remain well dispersed whereas EXAFS data are in agreement with the finding that the deposited clusters have an average size of ca. 5 nm and feature the same composition as the ablated alloy targets. A composition-dependant electron transfer from Au to Ag that is likely to impart chemical stability to the bimetallic clusters and protect Ag atoms against oxidation is additionally evidenced by XPS and XANES. Under simulated solar light, AuxAg1-x clusters show a remarkable composition-dependent volcano-type enhancement of their photocatalytic activity towards degradation of stearic acid, a model compound for organic fouling on surfaces. The Formal Quantum Efficiency (FQE) is peaking at the Au0.3Ag0.7 composition with a value that is twice as high as that of the pristine TiO2 P25 under solar simulator. Under UV the FQE of all compositions remains similar to that of pristine TiO2. A classical electromagnetic simulation study confirms that among all compositions Au0.3Ag0.7 features the largest near-field enhancement in the wavelength range of maximal solar light intensity, as well as sufficient individual photon energy resulting in a better photocatalytic self-cleaning activity. This allows ascribing the mechanism for photocatalysis mostly to the plasmonic effect of the bimetallic clusters through direct electron injection and near-field enhancement from the resonant cluster towards the conduction band of TiO2. These results not only demonstrate the added value of using well-defined bimetallic nanocatalysts to enhance their photocatalytic activity but also highlights the potential of the cluster beam deposition to design tailored noble metal modified photocatalytic surfaces with controlled compositions and sizes without involving potentially hazardous chemical agents.
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Affiliation(s)
- Vana Chinnappa Chinnabathini
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Fons Dingenen
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Rituraj Borah
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Imran Abbas
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Johan van der Tol
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Zviadi Zarkua
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | | | - Thi Hong Trang Nguyen
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Peter Lievens
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Didier Grandjean
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
| | - Sammy W Verbruggen
- Sustainable Energy, Air & Water Technology (DuEL), University of Antwerp, Belgium
- NANOlab Center of Excellence, University of Antwerpen, Groenenborgerlaan 171, 2020, Antwerpen, Belgium
| | - Ewald Janssens
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Belgium.
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Gentili D, Ori G. Reversible assembly of nanoparticles: theory, strategies and computational simulations. NANOSCALE 2022; 14:14385-14432. [PMID: 36169572 DOI: 10.1039/d2nr02640f] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The significant advances in synthesis and functionalization have enabled the preparation of high-quality nanoparticles that have found a plethora of successful applications. The unique physicochemical properties of nanoparticles can be manipulated through the control of size, shape, composition, and surface chemistry, but their technological application possibilities can be further expanded by exploiting the properties that emerge from their assembly. The ability to control the assembly of nanoparticles not only is required for many real technological applications, but allows the combination of the intrinsic properties of nanoparticles and opens the way to the exploitation of their complex interplay, giving access to collective properties. Significant advances and knowledge gained over the past few decades on nanoparticle assembly have made it possible to implement a growing number of strategies for reversible assembly of nanoparticles. In addition to being of interest for basic studies, such advances further broaden the range of applications and the possibility of developing innovative devices using nanoparticles. This review focuses on the reversible assembly of nanoparticles and includes the theoretical aspects related to the concept of reversibility, an up-to-date assessment of the experimental approaches applied to this field and the advanced computational schemes that offer key insights into the assembly mechanisms. We aim to provide readers with a comprehensive guide to address the challenges in assembling reversible nanoparticles and promote their applications.
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Affiliation(s)
- Denis Gentili
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN), Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Guido Ori
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Rue du Loess 23, F-67034 Strasbourg, France.
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Mitra G, Low JZ, Wei S, Francisco KR, Deffner M, Herrmann C, Campos LM, Scheer E. Interplay between Magnetoresistance and Kondo Resonance in Radical Single-Molecule Junctions. NANO LETTERS 2022; 22:5773-5779. [PMID: 35849010 DOI: 10.1021/acs.nanolett.2c01199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
We report transport measurements on tunable single-molecule junctions of the organic perchlorotrityl radical molecule, contacted with gold electrodes at low temperature. The current-voltage characteristics of a subset of junctions shows zero-bias anomalies due to the Kondo effect and in addition elevated magnetoresistance (MR). Junctions without Kondo resonance reveal a much stronger MR. Furthermore, we show that the amplitude of the MR can be tuned by mechanically stretching the junction. On the basis of these findings, we attribute the high MR to an interference effect involving spin-dependent scattering at the metal-molecule interface and assign the Kondo effect to the unpaired spin located in the center of the molecule in asymmetric junctions.
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Affiliation(s)
- Gautam Mitra
- Department of Physics, University of Konstanz, 78457 Konstanz, Germany
| | - Jonathan Z Low
- Department of Chemistry, Columbia University, New York, New York 10027, United States
- Singapore Institute of Manufacturing Technology, 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Sujun Wei
- Department of Chemistry, Queensborough Community College of the City University of New York, Bayside, New York 11364, United States
| | - Karol R Francisco
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Michael Deffner
- Institut für Anorganische und Angewandte Chemie, The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany
| | - Carmen Herrmann
- Institut für Anorganische und Angewandte Chemie, The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany
| | - Luis M Campos
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Elke Scheer
- Department of Physics, University of Konstanz, 78457 Konstanz, Germany
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Chakraborty S, Nalupurackal G, Gunaseelan M, Roy S, Lokesh M, Goswami J, Datta P, Mahapatra PS, Roy B. Facets of optically and magnetically induced heating in ferromagnetically doped-NaYF 4 particles. JOURNAL OF PHYSICS COMMUNICATIONS 2022; 7:065008. [PMID: 37398924 PMCID: PMC7614712 DOI: 10.1088/2399-6528/acde43] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Upconverting particles like Yb and Er-doped NaYF4 are known to heat up after illumination with light at pump wavelength due to inefficient upconversion processes. Here we show that NaYF4 particles which have been co-doped not only with Yb and Er but also Fe improves the photothermal conversion efficiency. In addition, we show for the first time that alternating magnetic fields also heat up the ferromagnetic particles. Thereafter we show that a combination of optical and magnetic stimuli significantly increases the heat generated by the particles.
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Affiliation(s)
- Snigdhadev Chakraborty
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-group, Micro Nano and Bio-Fluidics (MNBF)-Group, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Gokul Nalupurackal
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-group, Micro Nano and Bio-Fluidics (MNBF)-Group, Indian Institute of Technology Madras, Chennai, 600036, India
| | - M Gunaseelan
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-group, Micro Nano and Bio-Fluidics (MNBF)-Group, Indian Institute of Technology Madras, Chennai, 600036, India
- Department of Physics, Rathinam Research Hub, Rathinam College of Arts and Science, Coimbatore, 641021, India
| | - Srestha Roy
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-group, Micro Nano and Bio-Fluidics (MNBF)-Group, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Muruga Lokesh
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-group, Micro Nano and Bio-Fluidics (MNBF)-Group, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Jayesh Goswami
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-group, Micro Nano and Bio-Fluidics (MNBF)-Group, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Priyankan Datta
- Department of Mechanical engineering, Indian Institute of Technology Madras, India
| | | | - Basudev Roy
- Department of Physics, Quantum Centres in Diamond and Emergent Materials (QuCenDiEM)-group, Micro Nano and Bio-Fluidics (MNBF)-Group, Indian Institute of Technology Madras, Chennai, 600036, India
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9
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Joudeh N, Linke D. Nanoparticle classification, physicochemical properties, characterization, and applications: a comprehensive review for biologists. J Nanobiotechnology 2022; 20:262. [PMID: 35672712 PMCID: PMC9171489 DOI: 10.1186/s12951-022-01477-8] [Citation(s) in RCA: 136] [Impact Index Per Article: 68.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 05/23/2022] [Indexed: 12/31/2022] Open
Abstract
Interest in nanomaterials and especially nanoparticles has exploded in the past decades primarily due to their novel or enhanced physical and chemical properties compared to bulk material. These extraordinary properties have created a multitude of innovative applications in the fields of medicine and pharma, electronics, agriculture, chemical catalysis, food industry, and many others. More recently, nanoparticles are also being synthesized ‘biologically’ through the use of plant- or microorganism-mediated processes, as an environmentally friendly alternative to the expensive, energy-intensive, and potentially toxic physical and chemical synthesis methods. This transdisciplinary approach to nanoparticle synthesis requires that biologists and biotechnologists understand and learn to use the complex methodology needed to properly characterize these processes. This review targets a bio-oriented audience and summarizes the physico–chemical properties of nanoparticles, and methods used for their characterization. It highlights why nanomaterials are different compared to micro- or bulk materials. We try to provide a comprehensive overview of the different classes of nanoparticles and their novel or enhanced physicochemical properties including mechanical, thermal, magnetic, electronic, optical, and catalytic properties. A comprehensive list of the common methods and techniques used for the characterization and analysis of these properties is presented together with a large list of examples for biogenic nanoparticles that have been previously synthesized and characterized, including their application in the fields of medicine, electronics, agriculture, and food production. We hope that this makes the many different methods more accessible to the readers, and to help with identifying the proper methodology for any given nanoscience problem.
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Zhou M, Zou X, Cheng K, Zhong S, Su Y, Wu T, Tao Y, Cong L, Yan B, Jiang Y. The role of cell-penetrating peptides in potential anti-cancer therapy. Clin Transl Med 2022; 12:e822. [PMID: 35593206 PMCID: PMC9121317 DOI: 10.1002/ctm2.822] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 03/28/2022] [Accepted: 04/04/2022] [Indexed: 12/19/2022] Open
Abstract
Due to the complex physiological structure, microenvironment and multiple physiological barriers, traditional anti-cancer drugs are severely restricted from reaching the tumour site. Cell-penetrating peptides (CPPs) are typically made up of 5-30 amino acids, and can be utilised as molecular transporters to facilitate the passage of therapeutic drugs across physiological barriers. Up to now, CPPs have widely been used in many anti-cancer treatment strategies, serving as an excellent potential choice for oncology treatment. However, their drawbacks, such as the lack of cell specificity, short duration of action, poor stability in vivo, compatibility problems (i.e. immunogenicity), poor therapeutic efficacy and formation of unwanted metabolites, have limited their further application in cancer treatment. The cellular uptake mechanisms of CPPs involve mainly endocytosis and direct penetration, but still remain highly controversial in academia. The CPPs-based drug delivery strategy could be improved by clever design or chemical modifications to develop the next-generation CPPs with enhanced cell penetration capability, stability and selectivity. In addition, some recent advances in targeted cell penetration that involve CPPs provide some new ideas to optimise CPPs.
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Affiliation(s)
- Meiling Zhou
- The Key Laboratory of Model Animal and Stem Cell Biology in Hunan Province, Hunan Normal University, Changsha, Hunan, China.,School of Medicine, Hunan Normal University, Changsha, Hunan, China
| | - Xi Zou
- The Key Laboratory of Model Animal and Stem Cell Biology in Hunan Province, Hunan Normal University, Changsha, Hunan, China.,School of Medicine, Hunan Normal University, Changsha, Hunan, China
| | - Kexin Cheng
- The Key Laboratory of Model Animal and Stem Cell Biology in Hunan Province, Hunan Normal University, Changsha, Hunan, China.,School of Medicine, Hunan Normal University, Changsha, Hunan, China
| | - Suye Zhong
- The Key Laboratory of Model Animal and Stem Cell Biology in Hunan Province, Hunan Normal University, Changsha, Hunan, China.,School of Medicine, Hunan Normal University, Changsha, Hunan, China
| | - Yangzhou Su
- The Key Laboratory of Model Animal and Stem Cell Biology in Hunan Province, Hunan Normal University, Changsha, Hunan, China.,School of Medicine, Hunan Normal University, Changsha, Hunan, China
| | - Tao Wu
- The Key Laboratory of Model Animal and Stem Cell Biology in Hunan Province, Hunan Normal University, Changsha, Hunan, China.,School of Medicine, Hunan Normal University, Changsha, Hunan, China
| | - Yongguang Tao
- Key Laboratory of Carcinogenesis and Cancer Invasion, Ministry of Education, Department of Pathology, Xiangya Hospital, School of Basic Medicine, Central South University, Changsha, Hunan, China
| | - Li Cong
- The Key Laboratory of Model Animal and Stem Cell Biology in Hunan Province, Hunan Normal University, Changsha, Hunan, China.,School of Medicine, Hunan Normal University, Changsha, Hunan, China
| | - Bin Yan
- Department of Pathology, The Second Clinical Medical College of Jinan University, The First Affiliated Hospital Southern University of Science and Technology, Shenzhen People's Hospital, Shenzhen, China
| | - Yiqun Jiang
- The Key Laboratory of Model Animal and Stem Cell Biology in Hunan Province, Hunan Normal University, Changsha, Hunan, China.,School of Medicine, Hunan Normal University, Changsha, Hunan, China
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Ostruszka R, Zoppellaro G, Tomanec O, Pinkas D, Filimonenko V, Šišková K. Evidence of Au(II) and Au(0) States in Bovine Serum Albumin-Au Nanoclusters Revealed by CW-EPR/LEPR and Peculiarities in HR-TEM/STEM Imaging. NANOMATERIALS 2022; 12:nano12091425. [PMID: 35564133 PMCID: PMC9105226 DOI: 10.3390/nano12091425] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 04/11/2022] [Accepted: 04/19/2022] [Indexed: 02/01/2023]
Abstract
Bovine serum albumin-embedded Au nanoclusters (BSA-AuNCs) are thoroughly probed by continuous wave electron paramagnetic resonance (CW-EPR), light-induced EPR (LEPR), and sequences of microscopic investigations performed via high-resolution transmission electron microscopy (HR-TEM), scanning transmission electron microscopy (STEM), and energy dispersive X-ray analysis (EDS). To the best of our knowledge, this is the first report analyzing the BSA-AuNCs by CW-EPR/LEPR technique. Besides the presence of Au(0) and Au(I) oxidation states in BSA-AuNCs, the authors observe a significant amount of Au(II), which may result from a disproportionation event occurring within NCs: 2Au(I) → Au(II) + Au(0). Based on the LEPR experiments, and by comparing the behavior of BSA versus BSA-AuNCs under UV light irradiation (at 325 nm) during light off-on-off cycles, any energy and/or charge transfer event occurring between BSA and AuNCs during photoexcitation can be excluded. According to CW-EPR results, the Au nano assemblies within BSA-AuNCs are estimated to contain 6–8 Au units per fluorescent cluster. Direct observation of BSA-AuNCs by STEM and HR-TEM techniques confirms the presence of such diameters of gold nanoclusters in BSA-AuNCs. Moreover, in situ formation and migration of Au nanostructures are observed and evidenced after application of either a focused electron beam from HR-TEM, or an X-ray from EDS experiments.
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Affiliation(s)
- Radek Ostruszka
- Department of Experimental Physics, Faculty of Science, Palacký University, tř. 17. Listopadu 12, 77900 Olomouc, Czech Republic;
| | - Giorgio Zoppellaro
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University, tř. 17. Listopadu 12, 77900 Olomouc, Czech Republic;
- Correspondence: (G.Z.); (K.Š.)
| | - Ondřej Tomanec
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University, tř. 17. Listopadu 12, 77900 Olomouc, Czech Republic;
| | - Dominik Pinkas
- Institute of Molecular Genetics of the Czech Academy of Sciences, Microscopy Centre, Electron Microscopy Core Facility, Vídeňská 1083, 14220 Prague, Czech Republic; (D.P.); (V.F.)
| | - Vlada Filimonenko
- Institute of Molecular Genetics of the Czech Academy of Sciences, Microscopy Centre, Electron Microscopy Core Facility, Vídeňská 1083, 14220 Prague, Czech Republic; (D.P.); (V.F.)
| | - Karolína Šišková
- Department of Experimental Physics, Faculty of Science, Palacký University, tř. 17. Listopadu 12, 77900 Olomouc, Czech Republic;
- Correspondence: (G.Z.); (K.Š.)
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12
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Litak NP, Mawby LM, Lear BJ. Surface Chemistry Controls the Density of States in Metallic Nanoparticles. ACS NANO 2022; 16:4479-4486. [PMID: 35274922 DOI: 10.1021/acsnano.1c10877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Ligand-stabilized colloidal metallic nanoparticles are prized in science and technology for their electronic properties and tunable surface chemistry. However, little is known about the interplay between these two aspects of the particles. A particularly glaring absence concerns the density of electronic states, which is fundamental in explaining the electronic properties of solid-state materials. In part, this absence owes to the difficulty in the experimental determination of the parameter for colloidal systems. Herein, we demonstrate the density of electronic states for metallic colloidal particles can be determined from their magnetic susceptibility, measured using nuclear magnetic resonance spectroscopy. For this study, we use small alkanethiolate protected gold nanoparticles and demonstrate that changes in the surface chemistry, as subtle as changes in alkane chain length, can result inasmuch as a 3-fold change in the density of states at the Fermi level for these particles. This suggests that surface chemistry can be a powerful tool for controlling the electronic behavior of the materials to which they are attached, and suggests a paradigm that could be applied to other metallic systems, such as other metal nanoparticles, doped semiconductor systems, and even 2D metals. For all of these metallic systems, the Evans method can serve as a simple means to probe the density of states near the Fermi level.
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Affiliation(s)
- Nicholas P Litak
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States of America
| | - Lillian M Mawby
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States of America
| | - Benjamin J Lear
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States of America
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13
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Observation of Cu Spin Fluctuations in High- Tc Cuprate Superconductor Nanoparticles Investigated by Muon Spin Relaxation. NANOMATERIALS 2021; 11:nano11123450. [PMID: 34947799 PMCID: PMC8706420 DOI: 10.3390/nano11123450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 12/11/2021] [Accepted: 12/14/2021] [Indexed: 11/16/2022]
Abstract
The nano-size effects of high-Tc cuprate superconductor La2-xSrxCuO4 with x = 0.20 are investigated using X-ray diffractometry, Transmission electron microscopy, and muon-spin relaxation (μSR). It is investigated whether an increase in the bond distance of Cu and O atoms in the conducting layer compared to those of the bulk state might affect its physical and magnetic properties. The μSR measurements revealed the slowing down of Cu spin fluctuations in La2-xSrxCuO4 nanoparticles, indicating the development of a magnetic correlation at low temperatures. The magnetic correlation strengthens as the particle size reduces. This significantly differs from those observed in the bulk form, which show a superconducting state below Tc. It is indicated that reducing the particle size of La2-xSrxCuO4 down to nanometer size causes the appearance of magnetism. The magnetism enhances with decreasing particle size.
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14
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Laser photo-thermal therapy of epithelial carcinoma using pterin-6-carboxylic acid conjugated gold nanoparticles. Photochem Photobiol Sci 2021; 20:1599-1609. [PMID: 34750785 DOI: 10.1007/s43630-021-00122-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 10/19/2021] [Indexed: 10/19/2022]
Abstract
Gold nanoparticles functionalized with folic acid toward the internalization into cancer cells have received considerable attention recently. Folic acid is recognized by folate receptors, which are overexpressed in several cancer cells; it is limited in normal cells. In this work, pterin-6-carboxylic acid is proposed as an agonist of folic acid since the pterin-6-carboxylic acid structure has a pterin moiety, the same as folic acid that is recognized by the folate receptor. Here a simple photochemical synthesis of gold nanoparticles functionalized with pterin-6-carboxylic acid is studied. These conjugates were used to cause photothermal damage of HeLa cells irradiating with a diode laser of 808 nm. Pterin-6-carboxylic acid-conjugated gold nanoparticles caused the death of the cell after near-infrared irradiation, dose-dependently. These results indicate a possible internalization of AuNPs via folate receptor-mediated endocytosis due to the recognition or interaction between the folate receptors of HeLa cells and pterin, P6CA.
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15
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Ulloa J, Lorusso G, Evangelisti M, Camón A, Barberá J, Serrano JL. Magnetism of Dendrimer-Coated Gold Nanoparticles: A Size and Functionalization Study. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:20482-20487. [PMID: 35774116 PMCID: PMC9236199 DOI: 10.1021/acs.jpcc.1c04213] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Indexed: 06/15/2023]
Abstract
Highly sensitive magnetometry reveals paramagnetism in dendrimer-coated gold nanoparticles. Different types of such nanoparticles, as a result of (i) functionalizing with two distinct Percec-type dendrons, linked to gold via dodecanethiol groups, and (ii) postsynthesis annealing in a solvent-free environment that further promotes their growth have been prepared. Ultimately, for each of the two functionalization configurations, we obtain highly monodisperse and stable nanoparticles of two different sizes, with spherical shape. These characteristics allow singling out the source of the measured paramagnetic signals as exclusively arising from the undercoordinated gold atoms on the surfaces of the nanoparticles. Bulk gold and the functional groups of the ligands contribute only diamagnetically.
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Affiliation(s)
- José
A. Ulloa
- Departamento
de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Concepción, 160-C, Calle Edmundo Larenas 129, 4070371 Concepción, Chile
| | - Giulia Lorusso
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC−Universidad de Zaragoza, 50009 Zaragoza, Spain
- CNR
- Istituto per la Microelettronica e Microsistemi, Unità di Bologna, Via Gobetti 101, 40129 Bologna, Italy
| | - Marco Evangelisti
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC−Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Agustín Camón
- Instituto
de Nanociencia y Materiales de Aragón (INMA), CSIC−Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Joaquín Barberá
- Instituto
de Nanociencia y Materiales de Aragón (INMA), Departamento
de Química Orgánica, Universidad
de Zaragoza-CSIC, C/
Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - José L. Serrano
- Instituto
de Nanociencia y Materiales de Aragón (INMA), Departamento
de Química Orgánica, Universidad
de Zaragoza-CSIC, C/
Pedro Cerbuna 12, 50009 Zaragoza, Spain
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16
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Farkaš B, de Leeuw NH. A Perspective on Modelling Metallic Magnetic Nanoparticles in Biomedicine: From Monometals to Nanoalloys and Ligand-Protected Particles. MATERIALS (BASEL, SWITZERLAND) 2021; 14:3611. [PMID: 34203371 PMCID: PMC8269646 DOI: 10.3390/ma14133611] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 06/17/2021] [Accepted: 06/21/2021] [Indexed: 12/24/2022]
Abstract
The focus of this review is on the physical and magnetic properties that are related to the efficiency of monometallic magnetic nanoparticles used in biomedical applications, such as magnetic resonance imaging (MRI) or magnetic nanoparticle hyperthermia, and how to model these by theoretical methods, where the discussion is based on the example of cobalt nanoparticles. Different simulation systems (cluster, extended slab, and nanoparticle models) are critically appraised for their efficacy in the determination of reactivity, magnetic behaviour, and ligand-induced modifications of relevant properties. Simulations of the effects of nanoscale alloying with other metallic phases are also briefly reviewed.
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Affiliation(s)
- Barbara Farkaš
- School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK;
| | - Nora H. de Leeuw
- School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK;
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
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17
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Desale K, Kuche K, Jain S. Cell-penetrating peptides (CPPs): an overview of applications for improving the potential of nanotherapeutics. Biomater Sci 2021; 9:1153-1188. [PMID: 33355322 DOI: 10.1039/d0bm01755h] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In the field of nanotherapeutics, gaining cellular entry into the cytoplasm of the target cell continues to be an ultimate challenge. There are many physicochemical factors such as charge, size and molecular weight of the molecules and delivery vehicles, which restrict their cellular entry. Hence, to dodge such situations, a class of short peptides called cell-penetrating peptides (CPPs) was brought into use. CPPs can effectively interact with the cell membrane and can assist in achieving the desired intracellular entry. Such strategy is majorly employed in the field of cancer therapy and diagnosis, but now it is also used for other purposes such as evaluation of atherosclerotic plaques, determination of thrombin levels and HIV therapy. Thus, the current review expounds on each of these mentioned aspects. Further, the review briefly summarizes the basic know-how of CPPs, their utility as therapeutic molecules, their use in cancer therapy, tumor imaging and their assistance to nanocarriers in improving their membrane penetrability. The review also discusses the challenges faced with CPPs pertaining to their stability and also mentions the strategies to overcome them. Thus, in a nutshell, this review will assist in understanding how CPPs can present novel possibilities for resolving the conventional issues faced with the present-day nanotherapeutics.
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Affiliation(s)
- Kalyani Desale
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab-160062, India.
| | - Kaushik Kuche
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab-160062, India.
| | - Sanyog Jain
- Centre for Pharmaceutical Nanotechnology, Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Punjab-160062, India.
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18
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Swain DK, Mallik G, Srivastava P, Kushwaha AK, Rajput P, Jha SN, Lim S, Kim S, Rath S. Single Mn Atom Doping in Chiral Sensitive Assembled Gold Clusters to Molecular Magnet. ACS NANO 2021; 15:6289-6295. [PMID: 33666080 DOI: 10.1021/acsnano.0c10260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Chiral stirred optical and magnetic properties, through the doping of assembled ultrasmall metal clusters (AMCs), are promising discernment to rivet the molecule-like quantum devices. Here, the single manganese (Mn) atom doping and assembly of the gold cluster (Au8), leading to the chirality driven magnetism, has been achieved through a ligand-mediated growth. The X-ray absorption near edge structure and electron paramagnetic resonance studies corroborate the tetrahedral coordinated local structure of Mn dopant in the Au host. The optical and vibrational circular dichroic analysis affirms the modulation of chirality (negative to positive) in the presence of the Mn. A distinct ferromagnetic hysteresis loop at 300 K shows Mn ridden chiral sensitive ferromagnetism in contrary to the ligand influenced superparamagnetic undoped AMCs. The spin-polarized density functional theory level of calculations reveal the partial overlapping of spin-up and -down density of states in the doped AMCs, attributing to the ferromagnetic nature as like a molecular magnet suitable for the opto-spintronics application.
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Affiliation(s)
- Deepak K Swain
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Argul Jatni, 752050, India
| | - Gyanadeep Mallik
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Argul Jatni, 752050, India
| | - Pooja Srivastava
- Department of Physics, Amity University Uttar Pradesh, Lucknow, 226010, India
| | - Anoop K Kushwaha
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Argul Jatni, 752050, India
| | - Parasmani Rajput
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - Shambhu N Jha
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - Seokmin Lim
- Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
- Division of Nano and Information Technology, University of Science and Technology, Daejeon, 34113, Republic of Korea
| | - Seungchul Kim
- Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Satchidananda Rath
- School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Argul Jatni, 752050, India
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19
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Vignolo M, Bovone G, Capra M, Loria F, Bernini C, Vileno B, Mager L, Donnio B, Rastei MV, Gallani J. Magnetism: Another Idiosyncrasy of Boron? Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202001075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | | | - Marco Capra
- SPIN-CNR Corso F.M. Perrone, 24 16152 Genova Italy
| | | | | | - Bertrand Vileno
- POMAM Institut de Chimie de Strasbourg, UMR 7177 Université de Strasbourg 1 rue Blaise Pascal, BP 296 R8 67008 Strasbourg Cedex France
| | - Loïc Mager
- CNRS Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 23 Université de Strasbourg Rue du Loess 67034 Strasbourg cedex 2 France
| | - Bertrand Donnio
- CNRS Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 23 Université de Strasbourg Rue du Loess 67034 Strasbourg cedex 2 France
| | - Mircea V. Rastei
- CNRS Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 23 Université de Strasbourg Rue du Loess 67034 Strasbourg cedex 2 France
| | - Jean‐Louis Gallani
- CNRS Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 23 Université de Strasbourg Rue du Loess 67034 Strasbourg cedex 2 France
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20
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Cruz SS, Tanygin V, Lear BJ. Asymmetries in the Electronic Properties of Spheroidal Metallic Nanoparticles, Revealed by Conduction Electron Spin Resonance and Surface Plasmon Resonance. ACS NANO 2021; 15:4490-4503. [PMID: 33646754 DOI: 10.1021/acsnano.0c08515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Using electron spin resonance spectroscopy, we demonstrate that the morphological asymmetries present in small spheroidal metallic nanoparticles give rise to asymmetries in the behavior of electrons held in states near the metal's Fermi energy. We find that the effects of morphological asymmetries for these spheroidal systems are more important than the effects of size distributions when explaining the asymmetry in electronic behavior. This is found to be true for all the particles examined, which were made from Cu, Ag, Pd, Ir, Pt, and Au, bearing dodecanethiolate ligands. In the case of the Ag particles, we also demonstrate that the same model used to account for morphological effects in the electron spin resonance spectra can be used to account for small asymmetries present in the plasmon spectrum. This result demonstrates that the electronic properties of even small particles are tunable via morphological changes.
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Affiliation(s)
- Santina S Cruz
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Vadim Tanygin
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Benjamin J Lear
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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21
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Ulloa J, Barberá J, Serrano JL. Controlled Growth of Dendrimer-Coated Gold Nanoparticles: A Solvent-Free Process in Mild Conditions. ACS OMEGA 2021; 6:348-357. [PMID: 33458486 PMCID: PMC7807749 DOI: 10.1021/acsomega.0c04662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 10/26/2020] [Indexed: 05/16/2023]
Abstract
Monodisperse dendrimer-coated gold nanoparticles with a spherical shape have been obtained by direct reduction of HAuCl4 with sodium borohydride in the presence of dodecanethiol as a stabilizer and subsequent functionalization by ligand exchange reaction with polybenzylic thiolated dendrons. The substitution pattern of the dendrimeric units plays a fundamental role in the rate of the functionalization exchange process and consequently conditions the size and the polydispersity of the NPs obtained. An ulterior growth process occurs by thermal stimuli (150 °C) in a solvent-free environment. This method, carried out in mild conditions, allows the formation of highly monodisperse gold NPs with different sizes for different time reactions, and we discuss the mechanisms involved in this process. Finally, we demonstrate the chemical composition and stability of our compounds by structural, thermal, and chemical characterization of the samples before and after thermal treatment.
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Affiliation(s)
- José
Antonio Ulloa
- Instituto
de Nanociencia y Materiales de Aragón (INMA), Departamento
de Química Orgánica, Universidad
de Zaragoza-CSIC, C/Pedro
Cerbuna 12, 50009 Zaragoza, Spain
- Departamento
de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 160-C Concepción, Chile
| | - Joaquín Barberá
- Instituto
de Nanociencia y Materiales de Aragón (INMA), Departamento
de Química Orgánica, Universidad
de Zaragoza-CSIC, C/Pedro
Cerbuna 12, 50009 Zaragoza, Spain
| | - José Luis Serrano
- Instituto
de Nanociencia y Materiales de Aragón (INMA), Departamento
de Química Orgánica, Universidad
de Zaragoza-CSIC, C/Pedro
Cerbuna 12, 50009 Zaragoza, Spain
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22
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Mamontova E, Rodríguez-Castillo M, Oliviero E, Guari Y, Larionova J, Monge M, Long J. Designing heterostructured core@satellite Prussian Blue Analogue@Au–Ag nanoparticles: Effect on the magnetic properties and catalytic activity. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00008j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Prussian Blue Analogue@Au–Ag nanoparticles: Effect on the magnetic properties and catalytic activity.
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Affiliation(s)
| | - Maria Rodríguez-Castillo
- Departamento de Química
- Universidad de La Rioja
- Centro de Investigación en Síntesis Química (CISQ)
- Complejo Científico-Tecnológico
- Logroño
| | | | | | | | - Miguel Monge
- Departamento de Química
- Universidad de La Rioja
- Centro de Investigación en Síntesis Química (CISQ)
- Complejo Científico-Tecnológico
- Logroño
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23
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Boeva O, Antonov A, Zhavoronkova K. Influence of the nature of IB group metals on catalytic activity in reactions of homomolecular hydrogen exchange on Cu, Ag, Au nanoparticles. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2020.106173] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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24
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Rosin-based chiral wormlike Micelles: Rheological behavior and its application in preparing ultrasmall gold nanoparticles. J Colloid Interface Sci 2020; 579:61-70. [PMID: 32570031 DOI: 10.1016/j.jcis.2020.06.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 06/01/2020] [Accepted: 06/07/2020] [Indexed: 12/15/2022]
Abstract
Innovations in surfactant structures are a feasible way to prepare unique molecular aggregates with interesting properties. Herein, taking dehydroabietic acid as the starting material, a new amine oxide surfactant, abbreviated as R-8-AO, was synthesized. Cryogenic transmission electron microscopy (cryo-TEM) images and circular dichroism (CD) spectra reveal that at suitable concentrations, R-8-AO molecules form rarely discovered right-handed chiral wormlike micelles, which have a cross-sectional diameter of 5-6 nm. The overlap concentration of R-8-AO is approximately 8 mM, above which the wormlike micelles began to entangle in solutions. Due to the strong van der Waals forces between R-8-AO molecules, the scaling law gives an exponent of 7.88, which is higher than the theory predicted value. Gold nanoparticles were synthesized in-situ by irradiating mixed solutions of HAuCl4 and wormlike micelles formed by R-8-AO with UV light. These ultrasmall spherical gold nanoparticles, which are located at the surface of wormlike micelles, have a uniform particle size of 3 ± 1 nm, as observed by TEM. In addition, the gold nanoparticles form a worm-like morphology induced by the wormlike micelles, showing soft-aggregate-directed nanoparticle assembly. This work is first to reveal the effectiveness of preparing ultrasmall gold nanoparticles with new morphological wormlike micelles as soft templates. The resulting organic-inorganic hybrid aggregates are also expected to find applications in catalysis and electronic fields.
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25
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Dong P, Fisher EA, Meli MV, Trudel S. Tuning the magnetism of gold nanoparticles by changing the thiol coating. NANOSCALE 2020; 12:19797-19803. [PMID: 32966519 DOI: 10.1039/d0nr05674j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Room-temperature ferromagnetic behaviour has been reported in nanoscale materials expected to be diamagnetic, including gold. However, it is yet unclear which factors (size, shape, surface coating) predominantly influence the magnitude of the magnetic response. In this work, we study the magnetic and electronic properties of similarly-sized gold nanoparticles (Au NPs) coated with four different n-alkanethiols, as well as hydroxyl- and carboxyl-functionalized alkanethiols using superconducting quantum interference device (SQUID) magnetometry and ultraviolet photoelectron spectroscopy (UPS). We find room-temperature behaviour (hysteresis in magnetization vs. field strength loops) in all samples, as well as large effective magnetic anisotropy. Importantly, we find the nanoparticles coated with polar chain end-groups (-OH and -COOH) show markedly higher magnetization; this increased magnetization correlates with a higher work function. This work establishes chemical handles to enhance magnetism in nanoscale gold particles.
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Affiliation(s)
- Pengcheng Dong
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB, Canada T2N 1N4.
| | - Elizabeth A Fisher
- Department of Chemistry and Biochemistry, Mount Allison University, 63 C York Street, Sackville, NB, Canada E4L 1G8.
| | - M-Vicki Meli
- Department of Chemistry and Biochemistry, Mount Allison University, 63 C York Street, Sackville, NB, Canada E4L 1G8.
| | - Simon Trudel
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr NW, Calgary, AB, Canada T2N 1N4.
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26
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Tang C, Ku KH, Lennon Luo SX, Concellón A, Wu YCM, Lu RQ, Swager TM. Chelating Phosphine Ligand Stabilized AuNPs in Methane Detection. ACS NANO 2020; 14:11605-11612. [PMID: 32865975 DOI: 10.1021/acsnano.0c04154] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The capping reagent plays an essential role in the functional properties of gold nanoparticles (AuNPs). Multiple stimuli-responsive materials are generated via diverse surface modification. The ability of the organic ligand shell on a gold surface to create a porous shell capable of binding small molecules is demonstrated as an approach to detect molecules, such as methane, that would be otherwise difficult to sense. Thiols are the most studied capping ligands of AuNPs used in chemiresistors. Phosphine capping groups are usually seen as stabilizers in synthesis and catalysis. However, by virtue of the pyramidal shape of triarylphosphines, they are natural candidates to create intrinsic voids within the ligand shell of AuNPs. In this work, surface-functionalized (capped) AuNPs with chelating phosphine ligands are synthesized via two synthetic routes, enabling chemiresistive methane gas detection at sub-100 ppm levels. These AuNPs are compared to thiol-capped AuNPs, and studies were undertaken to evaluate structure-property relationships for their performance in the detection of hydrocarbons. Polymer overcoatings applied to the conductive networks of the functionalized AuNP arrays were shown to reduce resistivity by promoting the formation of conduction pathways with decreased core-core distance between nanoparticles. Observations made in the context of developing methane sensors provide insight relevant to applications of phosphine or phosphine-containing surface groups in functional AuNP materials.
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Affiliation(s)
- Cen Tang
- Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States
| | - Kang Hee Ku
- Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States
| | - Shao-Xiong Lennon Luo
- Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States
| | - Alberto Concellón
- Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States
| | - You-Chi Mason Wu
- Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States
| | - Ru-Qiang Lu
- Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States
| | - Timothy M Swager
- Department of Chemistry, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States
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27
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Zheng R, Bevacqua GM, Young NR, Allison TC, Tong YJ. Site-Dependent Spin Delocalization and Evidence of Ferrimagnetism in Atomically Precise Au 25(SR) 180 Clusters as Seen by Solution 13C NMR Spectroscopy. J Phys Chem A 2020; 124:7464-7469. [PMID: 32819099 DOI: 10.1021/acs.jpca.0c02915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We report a simple but detailed solution 13C nuclear magnetic resonance spectroscopic study of atomically precise neutral Au25(SR)180 (SR = alkyl thiolate) clusters. The paramagnetic 13C Knight shift of alkyl chain carbons, which is proportional to the local electron spin density, exhibits an electron spin delocalization that exponentially decays along the alkyl chain. The magnitude and decay constant of the observed electron spin delocalization, although largely independent of alkyl chain length, depend on where, that is, "in" versus "out" (vide infra) position, the alkyl chain is bound, in agreement with density functional theory calculations. Notably, the determined position-dependent decay constants, 1.70/Å and 0.41/Å for "in" and "out" ligands, respectively, not only could have important ramifications in molecular spintronics but are also comparable to measured decay constants in molecular electrical conductance of alkyl chains, potentially offering an alternative, simple method for estimating the latter. Moreover, the negative intercept temperatures of linear fits of reciprocal 13C (as well its bound 1H) Knight shift versus temperature strongly suggest the existence of local ferrimagnetism in individual Au25(SR)180 clusters.
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Affiliation(s)
- Rongfeng Zheng
- Department of Chemistry, Georgetown University, 37th & O Streets, NW, Washington, District of Columbia 20057, United States
| | - Gianna M Bevacqua
- Department of Chemistry, Georgetown University, 37th & O Streets, NW, Washington, District of Columbia 20057, United States
| | - Nicholas R Young
- Department of Chemistry, Georgetown University, 37th & O Streets, NW, Washington, District of Columbia 20057, United States
| | - Thomas C Allison
- Chemical Informatics Group, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8320, Gaithersburg, Maryland 20899-8320, United States
| | - YuYe J Tong
- Department of Chemistry, Georgetown University, 37th & O Streets, NW, Washington, District of Columbia 20057, United States
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28
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Bornacelli J, Torres-Torres C, Arenas-Alatorre J, Martínez-Mondragón MM, Rodríguez-Fernández L, Oliver A. Enhanced ultrafast optomagnetic effects in room-temperature ferromagnetic Pt nanoclusters embedded in silica by ion implantation. NANOTECHNOLOGY 2020; 31:355705. [PMID: 32422622 DOI: 10.1088/1361-6528/ab93ec] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Ferromagnetic-like behavior at room temperature (300 K) was observed in Pt particles embedded in ion-implanted silica matrices. Results in samples integrated by ultra-small photoluminescent Pt clusters (<2 nm) were compared with samples containing exclusively larger plasmonic Pt nanoparticles (>3 nm). The ferromagnetic behavior coexists simultaneously with a diamagnetic response. Enhanced diamagnetic response of one order of magnitude was observed compared to typical diamagnetism in pure silica, and it is increased with the mean diameter of the Pt particles. Besides, a larger sensitivity to an external field was observed in the ferromagnetic response of the nanostructures with a characteristic saturation at 20 kOe. This ferromagnetic behavior was only observed in the samples with nucleated Pt particles. The magnitude of the saturation magnetization shows up to a fivefold increase in the samples with smaller particle size and larger particle density. Saturation magnetization was observed between 3-15 × 10-4 emu g-1, with remanent magnetization of 0.2-0.6 × 10-4emu g-1, measured at 300 K. Coercitive fields also decrease in samples with smaller size and particles density, with values of 114 and 300 Oe. At lower temperatures (5 K) the saturation magnetization increases, as it would be expected from a ferromagnetic state. Optomagnetic response was studied by inverse Faraday effects and induced photomagnetization with circular polarized picosecond pulsed light at 1064 nm wavelength. Results showed that samples with a stronger ferromagnetic response exhibit larger Faraday rotation up to 5.3 × 103deg cm-1 by light excitations with irradiances between 50 and 180 GW cm-2. These findings have immediate applications in multifunctional solid-state magneto-optical devices such as optical isolators, high-data storage devices and ultrafast all-optical switching of magnetization.
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Affiliation(s)
- J Bornacelli
- Sección de Estudios de Posgrado e Investigación, Escuela Superior de Ingeniería Mecánica y Eléctrica, Unidad Zacatenco, Instituto Politécnico Nacional, Ciudad de México 07738, México
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29
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Taira T, Yanagimoto T, Fouquet T, Sakai K, Sakai H, Imura T. Synthesis of an N-Heterocyclic Carbene-based Au(I) Coordinate Surfactant: Application for Alkyne Hydration Based on Au Nanoparticle Formation. J Oleo Sci 2020; 69:871-882. [PMID: 32641614 DOI: 10.5650/jos.ess20063] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
In this study, an N-heterocyclic carbene (NHC)-based metal coordinate surfactant (MCS), NHC-Au-MCS, in which the NHC framework afforded the bonding of the Au(I) at the linkage of the hydrophilic and hydrophobic moieties, was synthesized. The structure of NHC-Au-MCS was confirmed by 1H and 13C NMR spectroscopic measurements together with elemental analysis. Matrix-assisted laser desorption/ionization (MALDI), laser desorption/ionization (LDI), and electrospray ionization mass spectrometry (ESI-MS) indicated the distinct reactivity of NHC-Au-MCS, such as the exchange of Br to Cl and the formation of a cationic Au complex, where the two NHC ligands were coordinated to an Au(I) center upon laser activation. The surface tension and dynamic light scattering (DLS) measurements revealed that the coordination of Au(I) to NHC reduced the critical micelle concentration (CMC) of NHC-Au-MCS (1.3×10-5 M), which resulted in the formation of micelles at concentrations higher than the CMC in water. We also confirmed that the surface-active Au(I) complex of NHC-Au-MCS catalyzed the hydration of 1-dodecyne to 2-dodecanone in water in the absence of an organic solvent. On the basis of the detailed mechanistic investigations regarding the reactivity of NHC-Au-MCS, we revealed that NHC-Au-MCS partially translated into Au nanoparticles (AuNPs), which facilitated alkyne hydration. These mechanistic studies were supported by UV-vis measurements, transmission electron microscopy (TEM), and LDI-MS.
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Affiliation(s)
- Toshiaki Taira
- National Institute of Advanced Industrial Science and Technology (AIST)
| | | | - Thierry Fouquet
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Kenichi Sakai
- Faculty of Science and Technology, Tokyo University of Science
| | - Hideki Sakai
- Faculty of Science and Technology, Tokyo University of Science
| | - Tomohiro Imura
- National Institute of Advanced Industrial Science and Technology (AIST)
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30
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Moraes DA, Souza Junior JB, Ferreira FF, Mogili NVV, Varanda LC. Gold nanowire growth through stacking fault mechanism by oleylamine-mediated synthesis. NANOSCALE 2020; 12:13316-13329. [PMID: 32555890 DOI: 10.1039/d0nr03669b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Tadpole-like gold nanowires were obtained by the oleylamine-mediated synthesis presenting an unusual mixture of fcc and hcp phases. Structural analyses were performed to understand their structure and growth using aberration-corrected high-resolution scanning transmission electron microscopy and electron diffraction at the tail region of tadpoles showing that the anisotropic shape occurred due to stacking fault defects. Stacking faults and twin defects are responsible for the hcp phase inferring a defect dependent growth. The stacking fault model used in X-ray diffraction (XRD) refinement resulted in 60% of hcp stacking sequences. Temperature-dependent XRD analyses showed that the faults become unstable around 120 °C, and it is completely converted to the fcc phase at 230 °C. We attribute the nanowire formation to a stacking fault mechanism of growth that begins in the later stage of nanoparticle growth. The UV-Vis spectrum presented two localized surface plasmon resonance bands at 500 nm and from 800 nm extending to near-infrared, associated with transverse and longitudinal modes, respectively. A surprising ferromagnetic behavior is also observed with a blocking temperature near 300 K.
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Affiliation(s)
- Daniel A Moraes
- Colloidal Materials Group, Physical-Chemistry Department, Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos 13566-590, SP, Brazil.
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31
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Dehn MH, Cao Y, Wang PX, Cottrell SP, MacLachlan MJ, Fleming DG, Kiefl RF. Direct observation of muonium reacting with uncapped gold nanoparticles in porous silica and nature of the final state. J Chem Phys 2020; 152:184706. [PMID: 32414252 DOI: 10.1063/5.0004210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report the reaction of muonium (Mu = [μ+e-]), a light isotopic analog of hydrogen, with uncapped gold nanoparticles embedded in mesoporous silica. Using the radio-frequency muon spin rotation (RF-μSR) technique, we directly observe and characterize the resulting final state on the nanoparticle surface, showing conclusively its diamagnetic nature. The magnetic environment experienced by the reacted muons is only weakly perturbed compared to that of muons in a silica reference, consistent with the surface of the gold nanoparticles being metallic and non-magnetic. We demonstrate the potential of RF-μSR for the investigation of the surface properties of nanoparticles and show the feasibility of Knight shift measurements of muons on metal surfaces.
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Affiliation(s)
- M H Dehn
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Y Cao
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - P-X Wang
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - S P Cottrell
- ISIS Facility, Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxon OX11 0QX, United Kingdom
| | - M J MacLachlan
- Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - D G Fleming
- TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
| | - R F Kiefl
- Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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32
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Assis M, Pontes Ribeiro RA, Carvalho MH, Teixeira MM, Gobato YG, Prando GA, Mendonça CR, de Boni L, Aparecido de Oliveira AJ, Bettini J, Andrés J, Longo E. Unconventional Magnetization Generated from Electron Beam and Femtosecond Irradiation on α-Ag 2WO 4: A Quantum Chemical Investigation. ACS OMEGA 2020; 5:10052-10067. [PMID: 32391493 PMCID: PMC7203983 DOI: 10.1021/acsomega.0c00542] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/13/2020] [Indexed: 05/29/2023]
Abstract
Novel magnetic metals and metal oxides that use both the spin and charge of an electron offer exciting technological applications. Their discovery could boost research on functional nanoscale materials. Here, for the first time, we report the magnetization of α-Ag2WO4 under electron beam and femtosecond laser irradiation. The formation and growth of silver oxides (AgO, Ag2O, and Ag3O4) and Ag nanofilaments can be observed on the surface of α-Ag2WO4 crystals. These features were also present in the composition of an extruded material and could open new avenues for surface magnetism studies. In order to understand these results, we used first-principles density functional theory calculations. This allowed us to investigate several potential scenarios for controlling magnetic properties. The effect of electron addition on the crystalline structures of α-Ag2WO4, Ag3O4, Ag2O, and AgO has been analyzed in detail. The creation of Ag and O vacancies on these compounds was also analyzed. Based on structural and electronic changes at the local coordination site of Ag, a mechanism was proposed. The mechanism illustrates the processes responsible for the formation and growth of metallic Ag and the magnetic response to electron beam irradiation.
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Affiliation(s)
- Marcelo Assis
- CDMF,
LIEC, Chemistry Department, Federal University
of São Carlos—(UFSCar), P.O. Box 676, 13565-905 São
Carlos, São Paulo, Brazil
| | - Renan Augusto Pontes Ribeiro
- CDMF,
LIEC, Chemistry Department, Federal University
of São Carlos—(UFSCar), P.O. Box 676, 13565-905 São
Carlos, São Paulo, Brazil
| | - Maria Helena Carvalho
- Physics
Department, Federal University of São
Carlos—(UFSCar), P.O. Box 676, 13565-905 São Carlos, São Paulo, Brazil
| | - Mayara Mondego Teixeira
- CDMF,
LIEC, Chemistry Department, Federal University
of São Carlos—(UFSCar), P.O. Box 676, 13565-905 São
Carlos, São Paulo, Brazil
| | - Yara Galvão Gobato
- Physics
Department, Federal University of São
Carlos—(UFSCar), P.O. Box 676, 13565-905 São Carlos, São Paulo, Brazil
| | - Gabriela Augusta Prando
- Physics
Department, Federal University of São
Carlos—(UFSCar), P.O. Box 676, 13565-905 São Carlos, São Paulo, Brazil
| | - Cleber Renato Mendonça
- IFSC—Instituto
de Física de São Carlos, Universidade
de São Paulo—(USP), 13566-590 São Carlos, São Paulo, Brazil
| | - Leonardo de Boni
- IFSC—Instituto
de Física de São Carlos, Universidade
de São Paulo—(USP), 13566-590 São Carlos, São Paulo, Brazil
| | | | - Jefferson Bettini
- Brazilian
Nanotechnology National Laboratory (LNNano), Rua Giuseppe Maximo Scolfa no 10000, BR-13083100 Campinas, São Paulo, Brazil
| | - Juan Andrés
- Department
of Analytical and Physical Chemistry, University
Jaume I (UJI), 12071 Castelló, Spain
| | - Elson Longo
- CDMF,
LIEC, Chemistry Department, Federal University
of São Carlos—(UFSCar), P.O. Box 676, 13565-905 São
Carlos, São Paulo, Brazil
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33
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Fernández I, Ceballos AJ, Bolaños H, Rodríguez-Páez JE. TiO2 Nanostructures (TiO2-NSs): Synthesis, Characterization and Evaluation of Their Toxicity in the Swiss albino Mouse. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-019-01242-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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34
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Window PS, Ackerson CJ. Superatom Paramagnetism in Au 102(SR) 441-/0/1+/2+ Oxidation States. Inorg Chem 2020; 59:3509-3512. [PMID: 32090558 DOI: 10.1021/acs.inorgchem.9b02787] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Gold nanoclusters show distinctive magnetic properties and electronic structure. Nanoclusters of sufficiently small size restructure geometrically to stabilize electronically (e.g., a Jahn-Teller effect), whereas geometric distortion may not be possible in larger nanoclusters. In this work, the charge-state-dependent magnetism of the Au102(SPh)441-/0/1+/2+ nanocluster is investigated through Evans method NMR measurements. The 2+ charge state is shown as paramagnetic. This suggests that the nanocluster does not distort geometrically to pair electrons. Because the nanocluster lies within the transition range of molecule-like to bulk-like properties, this suggests that the geometric stabilization that becomes important in larger "magic number clusters" may be resistant to electronically driven distortions observed in smaller nanoclusters.
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Affiliation(s)
- Phillip S Window
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Christopher J Ackerson
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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35
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Li XP, Qu KY, Zhang F, Jiang HN, Zhang N, Nihad C, Liu CM, Wu KH, Wang XW, Huang NP. High-aspect-ratio water-dispersed gold nanowires incorporated within gelatin methacrylate hydrogels for constructing cardiac tissues in vitro. J Mater Chem B 2020; 8:7213-7224. [DOI: 10.1039/d0tb00768d] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The prepared high-aspect-ratio water-dispersed gold nanowires are incorporated into GeIMA hydrogels for cardiomyocyte culture and micro-cardiac tissue formation.
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36
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Zeng C, Weitz A, Withers G, Higaki T, Zhao S, Chen Y, Gil RR, Hendrich M, Jin R. Controlling magnetism of Au 133(TBBT) 52 nanoclusters at single electron level and implication for nonmetal to metal transition. Chem Sci 2019; 10:9684-9691. [PMID: 32015802 PMCID: PMC6977549 DOI: 10.1039/c9sc02736j] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 09/04/2019] [Indexed: 12/14/2022] Open
Abstract
The [Au133(SR)52]q nanocluster is discovered to possess one spin per particle when q = 0, but no unpaired electron when q = +1.
The transition from the discrete, excitonic state to the continuous, metallic state in thiolate-protected gold nanoclusters is of fundamental interest and has attracted significant efforts in recent research. Compared with optical and electronic transition behavior, the transition in magnetism from the atomic gold paramagnetism (Au 6s1) to the band behavior is less studied. In this work, the magnetic properties of 1.7 nm [Au133(TBBT)52]0 nanoclusters (where TBBT = 4-tert-butylbenzenethiolate) with 81 nominal “valence electrons” are investigated by electron paramagnetic resonance (EPR) spectroscopy. Quantitative EPR analysis shows that each cluster possesses one unpaired electron (spin), indicating that the electrons fill into discrete orbitals instead of a continuous band, for that one electron in the band would give a much smaller magnetic moment. Therefore, [Au133(TBBT)52]0 possesses a nonmetallic electronic structure. Furthermore, we demonstrate that the unpaired spin can be removed by oxidizing [Au133(TBBT)52]0 to [Au133(TBBT)52]+ and the nanocluster transforms from paramagnetism to diamagnetism accordingly. The UV-vis absorption spectra remain the same in the process of single-electron loss or addition. Nuclear magnetic resonance (NMR) is applied to probe the charge and magnetic states of Au133(TBBT)52, and the chemical shifts of 52 surface TBBT ligands are found to be affected by the spin in the gold core. The NMR spectrum of Au133(TBBT)52 shows a 13-fold splitting with 4-fold degeneracy of 52 TBBT ligands, which are correlated to the quasi-D2 symmetry of the ligand shell. Overall, this work provides important insights into the electronic structure of Au133(TBBT)52 by combining EPR, optical and NMR studies, which will pave the way for further understanding of the transition behavior in metal nanoclusters.
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Affiliation(s)
- Chenjie Zeng
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
| | - Andrew Weitz
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
| | - Gayathri Withers
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
| | - Tatsuya Higaki
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
| | - Shuo Zhao
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
| | - Yuxiang Chen
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
| | - Roberto R Gil
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
| | - Michael Hendrich
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
| | - Rongchao Jin
- Department of Chemistry , Carnegie Mellon University , 4400 Fifth Ave , Pittsburgh , PA , USA . ;
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37
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Beyk J, Tavakoli H. Selective radiofrequency ablation of tumor by magnetically targeting of multifunctional iron oxide-gold nanohybrid. J Cancer Res Clin Oncol 2019; 145:2199-2209. [PMID: 31309302 DOI: 10.1007/s00432-019-02969-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 07/01/2019] [Indexed: 01/16/2023]
Abstract
PURPOSE Radiofrequency (RF) ablation therapy is of great interest in cancer therapy as it is non-ionizing radiation and can effectively penetrate into the tissue. However, the current RF ablation technique is invasive that requires RF probe insertion into the tissue and generates a non-specific heating. Recently, RF-responsive nanomaterials such as gold nanoparticles (AuNPs) and iron oxide nanoparticles (IONPs) have led to tremendous progress in this area. They have been found to be able to absorb the RF field and induce a localized heating within the target, thereby affording a non-invasive and tumor-specific RF ablation strategy. In the present study, for the first time, we used a hybrid core-shell nanostructure comprising IONPs as the core and AuNPs as the shell (IO@Au) for targeted RF ablation therapy. Due to the magnetic core, the nanohybrid can be directed toward the tumor through a magnet. Moreover, IONPs enable the nanohybrid to be used as a magnetic resonance imaging (MRI) contrast agent. RESULTS In vitro cytotoxicity experiment showed that the combination of IO@Au and 13.56-MHz RF field significantly reduced the viability of cancer cells. Next, during an in vivo experiment, we demonstrated that magnetically targeting of IO@Au to the tumor and subsequent RF exposure dramatically suppressed the tumor growth. CONCLUSION Therefore, the integration of targeting, imaging, and therapeutic performances into IO@Au nanohybrid could afford the promise to improve the effectiveness of RF ablation therapy.
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Affiliation(s)
- Jaber Beyk
- Neuroscience Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Hassan Tavakoli
- Neuroscience Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran. .,Department of Physiology and Biophysics, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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38
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Affiliation(s)
- J M D Coey
- School of Physics, Trinity College, Dublin, Ireland.
- CRANN, Trinity College, Dublin, Ireland.
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39
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Rusimova KR, Slavov D, Pradaux-Caggiano F, Collins JT, Gordeev SN, Carbery DR, Wadsworth WJ, Mosley PJ, Valev VK. Atomic dispensers for thermoplasmonic control of alkali vapor pressure in quantum optical applications. Nat Commun 2019; 10:2328. [PMID: 31127090 PMCID: PMC6534619 DOI: 10.1038/s41467-019-10158-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 04/18/2019] [Indexed: 11/25/2022] Open
Abstract
Alkali metal vapors enable access to single electron systems, suitable for demonstrating fundamental light-matter interactions and promising for quantum logic operations, storage and sensing. However, progress is hampered by the need for robust and repeatable control over the atomic vapor density and over the associated optical depth. Until now, a moderate improvement of the optical depth was attainable through bulk heating or laser desorption – both time-consuming techniques. Here, we use plasmonic nanoparticles to convert light into localized thermal energy and to achieve optical depths in warm vapors, corresponding to a ~16 times increase in vapor pressure in less than 20 ms, with possible reload times much shorter than an hour. Our results enable robust and compact light-matter devices, such as efficient quantum memories and photon-photon logic gates, in which strong optical nonlinearities are crucial. Robust and fast control of the atomic vapor pressure in alkali vapor cells would greatly extend their use for many quantum technologies. Here, the authors exploit plasmonic absorption in a cell coating containing gold nanoparticles to control the vapor pressure with milliseconds response time.
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Affiliation(s)
- Kristina R Rusimova
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK.,Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK
| | - Dimitar Slavov
- Institute of Electronics, Bulgarian Academy of Sciences, Sofia, 1784, Bulgaria
| | - Fabienne Pradaux-Caggiano
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK.,Department of Chemistry, University of Bath, Bath, BA2 7AY, UK
| | - Joel T Collins
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK
| | - Sergey N Gordeev
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK
| | - David R Carbery
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK.,Department of Chemistry, University of Bath, Bath, BA2 7AY, UK
| | - William J Wadsworth
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK
| | - Peter J Mosley
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK
| | - Ventsislav K Valev
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY, UK. .,Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY, UK.
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40
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Cattaneo S, Althahban S, Freakley SJ, Sankar M, Davies T, He Q, Dimitratos N, Kiely CJ, Hutchings GJ. Synthesis of highly uniform and composition-controlled gold-palladium supported nanoparticles in continuous flow. NANOSCALE 2019; 11:8247-8259. [PMID: 30976773 DOI: 10.1039/c8nr09917k] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The synthesis of supported bimetallic nanoparticles with well-defined size and compositional parameters has long been a challenge. Although batch colloidal methods are commonly used to pre-form metal nanoparticles with the desired size-range in solution, inhomogeneous mixing of the reactant solutions often leads to variations in size, structure and composition from batch-to-batch and even particle-to-particle. Here we describe a millifluidic approach for the production of oxide supported monometallic Au and bimetallic AuPd nanoparticles in a continuous fashion. This optimised method enables the production of nanoparticles with smaller mean sizes, tighter particle size distributions and a more uniform particle-to-particle chemical composition as compared to the conventional batch procedure. In addition, we describe a facile procedure to prepare bimetallic Au@Pd core-shell nanoparticles in continuous flow starting from solutions of the metal precursors. Moreover, the relative ease of scalability of this technique makes the proposed methodology appealing not only for small-scale laboratory purposes, but also for the industrial-scale production of supported metal nanoparticles.
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Affiliation(s)
- Stefano Cattaneo
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK.
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41
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Tie M, Gravelsins S, Niewczas M, Dhirani AA. Large Kondo effect in assemblies of Au nanoparticles linked with alkanedithiol electron bridges. NANOSCALE 2019; 11:5395-5401. [PMID: 30849159 DOI: 10.1039/c8nr09280j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Using a prototypical nanoparticle-molecule assembly, namely alkanedithiol-linked gold nanoparticle films, we observe hallmark signatures of the Kondo effect in conductance vs. voltage as well as temperature measurements. Its contribution to temperature dependence of conductance is much larger than those from all other temperature-dependant effects up to 300 K by >20-fold - much larger than previous reports of the Kondo effect using other platforms. We find that previous models of the Kondo effect describe our data even in this regime. Given the synthetic control available over nanoparticle properties such as surface area, shape, and chemical composition, our work points to combining flexibility afforded by molecule + nanoparticle assemblies as a powerful way to generate materials exhibiting strong spin-electron interactions.
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Affiliation(s)
- Monique Tie
- Department of Chemistry, University of Toronto, Ontario, CanadaM5S 3H6.
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42
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Tzelepi K, Espinosa Garcia C, Williams P, Golding J. Galactose:PEGamine coated gold nanoparticles adhere to filopodia and cause extrinsic apoptosis. NANOSCALE ADVANCES 2019; 1:807-816. [PMID: 36132240 PMCID: PMC9473179 DOI: 10.1039/c8na00270c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 11/09/2018] [Indexed: 06/15/2023]
Abstract
Ultra-small gold nanoparticles, surface functionalised with a 50 : 50 ratio of a thiolated α-galactose derivative and a thiolated hexaethylene glycol amine, are toxic to HSC-3 oral squamous carcinoma cells. Differences in nanoparticle toxicity were found to be related to the synthesis duration, with 1 h reaction nanoparticles being less toxic than 5 h reaction nanoparticles. The ligand density decreased with longer reaction time, although the size, charge and ligand ratio remained similar. The concentration of sodium borohydride in the reaction decreased logarithmically over 5 h but remained within a concentration range sufficient to desorb weakly bound ligands, possibly explaining the observed gradual decrease in ligand density. Nanoparticle toxicity was abrogated by inhibition of either caspase 3/7 or caspase 8, but not by inhibition of caspase 9, consistent with extrinsic apoptosis. Electron microscopic analysis of cellular uptake demonstrated predominantly cytoplasmic localization. However, when energy-dependent transport was inhibited, by lowering the temperature to 4 °C, a remarkable adhesion of nanoparticles to filopodia was observed. Inhibition of filopodial assembly with a fascin inhibitor prevented nanoparticle adhesion to HSC-3 cells at 4 °C, while fascin inhibition at 37 °C resulted in less cytoplasmic uptake. More adhesion to HSC-3 filopodia was seen with the higher toxicity 5 h reaction time nanoparticles than with the 1 h nanoparticles. By including two further cell types (HaCaT keratinocytes and hCMEC/D3 endothelial cells), a pattern of increasing toxicity with filopodial binding of 5 h reaction nanoparticles became apparent.
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Affiliation(s)
- Konstantina Tzelepi
- School of Life, Health and Chemical Sciences, The Open University Walton Hall Milton Keynes MK7 6AA UK +44 (0)1908 653748
| | | | - Phil Williams
- Midatech Pharma 65 Innovation Drive, Milton Park Abingdon OX14 4RQ UK
| | - Jon Golding
- School of Life, Health and Chemical Sciences, The Open University Walton Hall Milton Keynes MK7 6AA UK +44 (0)1908 653748
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43
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Li Y, Li J, Chen L, Sun H, Zhang H, Guo H, Feng L. In situ Synthesis of Au-Induced Hierarchical Nanofibers/Nanoflakes Structured BiFeO 3 Homojunction Photocatalyst With Enhanced Photocatalytic Activity. Front Chem 2019; 6:649. [PMID: 30687696 PMCID: PMC6338033 DOI: 10.3389/fchem.2018.00649] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 12/12/2018] [Indexed: 01/09/2023] Open
Abstract
In order to further improve the photocatalytic performance of BiFeO3 (BFO), novel Au-induced hierarchical nanofibers/nanoflakes structured BiFeO3 homojunctions (Aux-BFO, x = 0, 0. 6, 1.2, 1.8, 2.4 wt%) were in situ synthesized through a simple reduction method with assist of sodium citrate under the analogous hydrothermal environment. The effect of loading amount of Au nanoparticles (NPs) on the physicochemical properties and photocatalytic activity was investigated in detail. The Au1.2-BFO NFs sample show the best photocatalytic activity (85.76%), much higher than that for pure BFO samples (49.49%), mainly due to the hierarchical nanofibers/nanoflakes structured homojunction, the surface plasmon resonance (SPR) effect of Au NPs, as well as the presence of defects (Fe2+/Fe3+ pairs and oxygen vacancy). Furthermore, the possible formation mechanism of the unique homojunction and the enhanced photocatalytic mechanism for the degradation of methylene blue (MB) dye are proposed. It is proven that holes (h+) play the decisive role in the photocatalytic process. The present work provides a fascinating way to synthesize efficient homojunctions for the degradation of organic pollutes.
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Affiliation(s)
- Yan'an Li
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, China
| | - Jiao Li
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, China
| | - Long Chen
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, China
| | - Haibin Sun
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, China
| | - Hua Zhang
- School of Materials Science and Engineering, Shandong University of Technology, Zibo, China
| | - Hong Guo
- Analysis & Testing Center, Shandong University of Technology, Zibo, China
| | - Liu Feng
- Analysis & Testing Center, Shandong University of Technology, Zibo, China
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44
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Mitcov D, Pedersen AH, Ceccato M, Gelardi RM, Hassenkam T, Konstantatos A, Reinholdt A, Sørensen MA, Thulstrup PW, Vinum MG, Wilhelm F, Rogalev A, Wernsdorfer W, Brechin EK, Piligkos S. Molecular multifunctionality preservation upon surface deposition for a chiral single-molecule magnet. Chem Sci 2019; 10:3065-3073. [PMID: 30996888 PMCID: PMC6428142 DOI: 10.1039/c8sc04917c] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 01/23/2019] [Indexed: 01/06/2023] Open
Abstract
Simultaneous retention of SMM behaviour and of optical activity is demonstrated upon surface deposition for a chiral SMM.
The synthesis and characterization of a chiral, enneanuclear Mn(iii)-based, Single-Molecule Magnet, [Mn9O4(Me-sao)6(L)3(MeO)3(MeOH)3]Cl (1; Me-saoH2 = methylsalicylaldoxime, HL = lipoic acid) is reported. Compound 1 crystallizes in the orthorhombic P212121 space group and consists of a metallic skeleton describing a defect super-tetrahedron missing one vertex. The chirality of the [MnIII9] core originates from the directional bridging of the Me-sao2– ligands via the –N–O– oximate moieties, which define a clockwise (1ΔΔ) or counter-clockwise (1ΛΛ) rotation in both the upper [MnIII3] and lower [MnIII6] subunits. Structural integrity and retention of chirality upon dissolution and upon deposition on (a) gold nanoparticles, 1@AuNPs, (b) transparent Au(111) surfaces, 1ΛΛ@t-Au(111); 1ΔΔ@t-Au(111), and (c) epitaxial Au(111) on mica surfaces, 1@e-Au(111), was confirmed by CD and IR spectroscopies, mass spectrometry, TEM, XPS, XAS, and AFM. Magnetic susceptibility and magnetization measurements demonstrate the simultaneous retention of SMM behaviour and optical activity, from the solid state, via dissolution, to the surface deposited species.
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Affiliation(s)
- Dmitri Mitcov
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Anders H Pedersen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Marcel Ceccato
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Rikke M Gelardi
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Tue Hassenkam
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Andreas Konstantatos
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Anders Reinholdt
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Mikkel A Sørensen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Peter W Thulstrup
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Morten G Vinum
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Fabrice Wilhelm
- ESRF-The European Synchrotron , CS 40220 , 38043 Grenoble Cedex 9 , France
| | - Andrei Rogalev
- ESRF-The European Synchrotron , CS 40220 , 38043 Grenoble Cedex 9 , France
| | - Wolfgang Wernsdorfer
- Institute Néel , CNRS , BP 166 , 25 Avenue de Martyrs , Grenoble , 38042 Cedex 9 , France
| | - Euan K Brechin
- EaStCHEM School of Chemistry , The University of Edinburgh , David Brewster Road , Edinburgh , EH9 3FJ , UK
| | - Stergios Piligkos
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
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45
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Abdelsalam SI, Bhatti MM. New Insight into AuNP Applications in Tumour Treatment and Cosmetics through Wavy Annuli at the Nanoscale. Sci Rep 2019; 9:260. [PMID: 30670730 PMCID: PMC6343012 DOI: 10.1038/s41598-018-36459-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 11/23/2018] [Indexed: 11/19/2022] Open
Abstract
The purpose of this study is to probe the peristaltic propulsion of a non-Newtonian fluid model with suspended gold nanoparticles. The base fluid is considered to simulate blood using the Carreau fluid model. We model a small annulus as a tube with a peristaltic wave containing a clot propagating towards the tube wall. An external variable magnetic field is also considered in the governing flow. An approximation for long wavelengths and small Reynolds numbers is employed to formulate the governing flow problem. The resulting nonlinear equations are solved using a perturbation scheme. Series solutions are obtained for the velocity profile, temperature profile, pressure rise and streamlines. The results indicate an enhancement in the temperature profile that can be utilized in eradicating tumour cells.
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Affiliation(s)
- Sara I Abdelsalam
- Basic Science, Faculty of Engineering, The British University in Egypt, Al-Shorouk City, Cairo, 11837, Egypt.
- Instituto de Matemáticas - Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro, 76230, Mexico.
| | - M M Bhatti
- Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, 200072, China
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46
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Roberts DM, Russek SE, Stoldt CR. Synthetic iron pyrite across length scales: interfacial defects and macroscopic properties. CrystEngComm 2019. [DOI: 10.1039/c9ce00145j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Iron pyrite (FeS2) has long represented a materials science challenge because of the immense sensitivity of its macroscopic behavior to defect structure.
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Affiliation(s)
- Dennice M. Roberts
- Department of Mechanical Engineering
- University of Colorado at Boulder
- Boulder
- USA
| | | | - Conrad R. Stoldt
- Department of Mechanical Engineering
- University of Colorado at Boulder
- Boulder
- USA
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47
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Amini SM. Gold nanostructures absorption capacities of various energy forms for thermal therapy applications. J Therm Biol 2018; 79:81-84. [PMID: 30612690 DOI: 10.1016/j.jtherbio.2018.12.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/04/2018] [Accepted: 12/09/2018] [Indexed: 02/06/2023]
Abstract
This mini-review has investigated the recent progress regarding gold nanostructures capacities of energy absorption for thermal therapy applications. Unselective thermal therapy of malignant and normal tissues could lead to irreversible damage to healthy tissues without effective treatment on target malignant tissues. In recent years, there has been a considerable progress in the field of cancer thermal therapy for treating target malignant tissues using nanostructures. Due to the remarkable physical properties of the gold nanoparticle, it has been considered as an exceptional element for thermal therapy techniques. Different types of gold nanoparticles have been used as energy absorbent for thermal therapy applications under several types of energy exposures. Electromagnetic, ultrasound, electric and magnetic field are examples for these energy sources. Well-known plasmonic photothermal therapy which applies electromagnetic radiation is under clinical investigation for the treatment of various medical conditions. However, there are many other techniques in this regard which should be explored.
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Affiliation(s)
- Seyed Mohammad Amini
- Radiation Biology Research Center, Iran University of Medical Sciences (IUMS), Tehran, Iran; Medical Nanotechnology Department, School of Advanced Technologies in Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran.
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48
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Manipulating and monitoring nanoparticles in micellar thin film superstructures. Nat Commun 2018; 9:5207. [PMID: 30523264 PMCID: PMC6283865 DOI: 10.1038/s41467-018-07568-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 11/09/2018] [Indexed: 11/18/2022] Open
Abstract
Understanding the dynamics of discrete self-assembled structures under influence of external triggers is of interest to harvest the potential of nano- and mesoscale materials. In particular, controlling the hierarchical organization of (macro)molecular and nanoparticle building blocks in monolayer superstructures is of paramount importance for tuning properties and characteristics. Here we show how the electron beam in cryo-transmission electron microscopy can be exploited to induce and follow local migration of building blocks and global migration of micellar aggregates inside micrometer-sized superstructures. We employ stroboscopic exposure to heat up and convert the vitrified superstructure into a liquid-like thin film under cryogenic conditions, resulting in controlled evaporation of water that finally leads to rupture of the micelle-containing superstructure. Micelle-embedded nanoparticles prove a powerful tool to study the complex hierarchically built-up superstructures, and to visualize both global movement of individual dendrimicelles and local migration of nanoparticles inside the micellar core during the exposure series. Understanding how nanoparticle superstructures respond to external stimuli is of importance to their potential application. Here, the authors demonstrate the use of cryo-transmission electron microscopy for monitoring and manipulating movement within nanoparticle-loaded dendrimicelle superstructure thin films upon irradiation with an electron beam.
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49
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Lopa NS, Rahman MM, Ahmed F, Ryu T, Sutradhar SC, Lei J, Kim J, Kim DH, Lee YH, Kim W. Simple, low-cost, sensitive and label-free aptasensor for the detection of cardiac troponin I based on a gold nanoparticles modified titanium foil. Biosens Bioelectron 2018; 126:381-388. [PMID: 30469076 DOI: 10.1016/j.bios.2018.11.012] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 10/26/2018] [Accepted: 11/10/2018] [Indexed: 01/17/2023]
Abstract
This research demonstrated the electrochemical modification of low-cost titanium (Ti) metal substrate with gold nanoparticles (AuNPs) for the aptamer-based detection of cardiac troponin I (cTnI). AuNPs were deposited onto Ti sheets by the potential-step deposition method with high density and homogeneity as well as good crystallinity. It was then applied as a transducer to immobilize a thiol-functionalized DNA aptamer via the self-assembled monolayer mechanism for the specific binding of cTnI. This was verified through electrochemical and morphological analyses. The aptasensor could detect cTnI in a linear range of 1-1100 pM with a detection limit of ca. 0.18 pM. The aptasensor showed high sensitivity and specificity to cTnI over other interfering compounds with good recoveries in the diluted human serum samples.
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Affiliation(s)
- Nasrin Siraj Lopa
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea
| | - Md Mahbubur Rahman
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea.
| | - Faiz Ahmed
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea
| | - Taewook Ryu
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea
| | | | - Jin Lei
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea
| | - Jaewoong Kim
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea
| | - Dae Ho Kim
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea
| | - Yong Hoon Lee
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea
| | - Whangi Kim
- Department of Energy and Materials, Konkuk University, Chungju 27478, Republic of Korea.
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50
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Abstract
Intriguing ferromagnetic behaviour has been reported in gold thin films — a diamagnetic material in the bulk — wherein large magnetic moments and uncommon anisotropy are often hallmark features. The tuning of the electronic and magnetic properties by the presence of molecular self-assembled monolayers has been proposed. In this work, we present the study of the magnetism of a wide collection of alkanethiols of differing chain lengths coated on Au. We find no or only very weak magnetism, casting doubt on the universality and reproducibility of this phenomenon.
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Affiliation(s)
- Pengcheng Dong
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
| | - Simon Trudel
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry and Institute for Quantum Science and Technology, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada
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