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Zhurenkov KE, Akbarinejad A, Porritt H, Horrocks MS, Malmström J. Colloidal Probe Technique Optimization for Determination of Young's Modulus of Soft Adhesive Hydrogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 39023221 DOI: 10.1021/acs.langmuir.4c01047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
Atomic force microscopy (AFM) is a valuable tool for determining the Young's modulus of a wide range of materials. However, it faces challenges, particularly when assessing adhesive materials like soft poly(N-isopropylacrylamide) (pNIPAM) hydrogels. This study focuses on enhancing the consistency and reliability of AFM measurements by functionally modifying AFM spherical tip cantilevers to address substrate adhesion issues with these hydrogels. Specifically, hydrophobic functionalization with 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFOCTS) emerged as the most effective approach, yielding consistent and reliable Young's modulus data across various pNIPAM hydrogel samples. This work highlights the importance of optimizing data acquisition in AFM, rather than relying on postprocessing, to reduce inconsistencies in Young's modulus assessment.
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Affiliation(s)
- Kirill E Zhurenkov
- Department of Chemical and Materials Engineering, The University of Auckland, 1010 Auckland, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, 6140 Wellington, New Zealand
| | - Alireza Akbarinejad
- Department of Chemical and Materials Engineering, The University of Auckland, 1010 Auckland, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, 6140 Wellington, New Zealand
| | - Harrison Porritt
- Department of Chemical and Materials Engineering, The University of Auckland, 1010 Auckland, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, 6140 Wellington, New Zealand
| | - Matthew S Horrocks
- Department of Chemical and Materials Engineering, The University of Auckland, 1010 Auckland, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, 6140 Wellington, New Zealand
| | - Jenny Malmström
- Department of Chemical and Materials Engineering, The University of Auckland, 1010 Auckland, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, 6140 Wellington, New Zealand
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Cerezo J, Gao S, Armaroli N, Ingrosso F, Prampolini G, Santoro F, Ventura B, Pastore M. Non-Phenomenological Description of the Time-Resolved Emission in Solution with Quantum-Classical Vibronic Approaches-Application to Coumarin C153 in Methanol. Molecules 2023; 28:molecules28093910. [PMID: 37175320 PMCID: PMC10180259 DOI: 10.3390/molecules28093910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 04/27/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023] Open
Abstract
We report a joint experimental and theoretical work on the steady-state spectroscopy and time-resolved emission of the coumarin C153 dye in methanol. The lowest energy excited state of this molecule is characterized by an intramolecular charge transfer thus leading to remarkable shifts of the time-resolved emission spectra, dictated by the methanol reorganization dynamics. We selected this system as a prototypical test case for the first application of a novel computational protocol aimed at the prediction of transient emission spectral shapes, including both vibronic and solvent effects, without applying any phenomenological broadening. It combines a recently developed quantum-classical approach, the adiabatic molecular dynamics generalized vertical Hessian method (Ad-MD|gVH), with nonequilibrium molecular dynamics simulations. For the steady-state spectra we show that the Ad-MD|gVH approach is able to reproduce quite accurately the spectral shapes and the Stokes shift, while a ∼0.15 eV error is found on the prediction of the solvent shift going from gas phase to methanol. The spectral shape of the time-resolved emission signals is, overall, well reproduced, although the simulated spectra are slightly too broad and asymmetric at low energies with respect to experiments. As far as the spectral shift is concerned, the calculated spectra from 4 ps to 100 ps are in excellent agreement with experiments, correctly predicting the end of the solvent reorganization after about 20 ps. On the other hand, before 4 ps solvent dynamics is predicted to be too fast in the simulations and, in the sub-ps timescale, the uncertainty due to the experimental time resolution (300 fs) makes the comparison less straightforward. Finally, analysis of the reorganization of the first solvation shell surrounding the excited solute, based on atomic radial distribution functions and orientational correlations, indicates a fast solvent response (≈100 fs) characterized by the strengthening of the carbonyl-methanol hydrogen bond interactions, followed by the solvent reorientation, occurring on the ps timescale, to maximize local dipolar interactions.
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Affiliation(s)
- Javier Cerezo
- Departamento de Química and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Institute of Chemistry of OrganoMetallic Compounds (ICCOM), National Research Council of Italy (CNR), Area di Ricerca di Pisa, Via Moruzzi 1, I-56124 Pisa, Italy
| | - Sheng Gao
- Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council of Italy (CNR), Via P. Gobetti 101, I-40129 Bologna, Italy
| | - Nicola Armaroli
- Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council of Italy (CNR), Via P. Gobetti 101, I-40129 Bologna, Italy
| | - Francesca Ingrosso
- Université de Lorraine & CNRS, Laboratoire de Physique et Chimie Théoriques (LPCT), F-54000 Nancy, France
| | - Giacomo Prampolini
- Institute of Chemistry of OrganoMetallic Compounds (ICCOM), National Research Council of Italy (CNR), Area di Ricerca di Pisa, Via Moruzzi 1, I-56124 Pisa, Italy
| | - Fabrizio Santoro
- Institute of Chemistry of OrganoMetallic Compounds (ICCOM), National Research Council of Italy (CNR), Area di Ricerca di Pisa, Via Moruzzi 1, I-56124 Pisa, Italy
| | - Barbara Ventura
- Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council of Italy (CNR), Via P. Gobetti 101, I-40129 Bologna, Italy
| | - Mariachiara Pastore
- Université de Lorraine & CNRS, Laboratoire de Physique et Chimie Théoriques (LPCT), F-54000 Nancy, France
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Feng H, Luo SXL, Croy RG, Essigmann JM, Swager TM. Interaction of N-nitrosamines with binuclear copper complexes for luminescent detection. Dalton Trans 2023; 52:3219-3233. [PMID: 36799554 PMCID: PMC9990372 DOI: 10.1039/d2dt03848j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Cu(I) from tetrakis(acetonitrile)copper(I) hexafluorophosphate ([Cu(MeCN)4]PF6) was complexed with five structurally related phosphines containing N-heterocycles. The interactions between the resulting complexes and some N-nitrosamines were studied using X-ray crystallography as well as emission spectroscopy. Upon complexation, three phosphine ligands bridge two Cu(I) centers to give paddlewheel type structures that displayed a range of emission wavelengths spanning the visible region. N-Nitrosodimethylamine (NDMA) was shown to coordinate to one of the two copper centers in some of the paddlewheel complexes in the solid state and this interaction also quenches their emissions in solution. The influence of the weakly coordinating anion on crystal and spectroscopic properties of one of the paddlewheel complexes was also examined using tetrakis(acetonitrile)copper(I) perchlorate ([Cu(MeCN)4]ClO4) as an alternative Cu(I) source. Similarly, copper(II) perchlorate hexahydrate (Cu(ClO4)2·6H2O) was used for complexation to observe the impact of metal oxidation state on the two aforementioned properties. Lastly, the spectroscopic properties of the complex between Ph2P(1-Isoquinoline) and Cu(I) was shown to exhibit solvent dependence when the counterion is ClO4-. These Cu(I) complexes are bench stable solids and may be useful materials for developing a fluorescence based detection method for N-nitrosamines.
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Affiliation(s)
- Haosheng Feng
- Institute for Soldier Nanotechnologies and Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
| | - Shao-Xiong Lennon Luo
- Institute for Soldier Nanotechnologies and Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
| | - Robert G Croy
- Department of Chemistry, Department of Biological Engineering and Center for Environmental Health Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - John M Essigmann
- Department of Chemistry, Department of Biological Engineering and Center for Environmental Health Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Timothy M Swager
- Institute for Soldier Nanotechnologies and Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
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Leonard H, Jiang X, Arshavsky-Graham S, Holtzman L, Haimov Y, Weizman D, Halachmi S, Segal E. Shining light in blind alleys: deciphering bacterial attachment in silicon microstructures. NANOSCALE HORIZONS 2022; 7:729-742. [PMID: 35616534 DOI: 10.1039/d2nh00130f] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
With new advances in infectious disease, antifouling surfaces, and environmental microbiology research comes the need to understand and control the accumulation and attachment of bacterial cells on a surface. Thus, we employ intrinsic phase-shift reflectometric interference spectroscopic measurements of silicon diffraction gratings to non-destructively observe the interactions between bacterial cells and abiotic, microstructured surfaces in a label-free and real-time manner. We conclude that the combination of specific material characteristics (i.e., substrate surface charge and topology) and characteristics of the bacterial cells (i.e., motility, cell charge, biofilm formation, and physiology) drive bacteria to adhere to a particular surface, often leading to a biofilm formation. Such knowledge can be exploited to predict antibiotic efficacy and biofilm formation, and enhance surface-based biosensor development, as well as the design of anti-biofouling strategies.
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Affiliation(s)
- Heidi Leonard
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
| | - Xin Jiang
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
| | - Sofia Arshavsky-Graham
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
| | - Liran Holtzman
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
| | - Yuri Haimov
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
| | - Daniel Weizman
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
| | - Sarel Halachmi
- Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, 3200003, Israel
- Department of Urology, Bnai Zion Medical Center, Haifa, 3104800, Israel
| | - Ester Segal
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
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Wang R, Cao Y, Qu H, Wang Y, Zheng L. Label-free detection of Cu(II) in fish using a graphene field-effect transistor gated by structure-switching aptamer probes. Talanta 2022; 237:122965. [PMID: 34736690 DOI: 10.1016/j.talanta.2021.122965] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/08/2021] [Accepted: 10/11/2021] [Indexed: 11/25/2022]
Abstract
Copper sulfate is a widely used agent to control insects, bacteria and algae for fishery. However, excess amount of copper ions in water accumulate in aquatic products through the ecological cycle system, highly threatening food safety and public health. Therefore, it is urgent to develop a rapid and efficient method for the determination of copper content in aquatic products. In this study, we developed a label-free biosensor for Cu(II) based on a graphene field-effect transistor gated by structure-switching aptamer probes (SSA-GFET) against Cu(II) we obtained before. The detection mechanism of the biosensor is attributed to the surface charge shift and the potential change of the gate electrode upon the specific binding of Cu(II). The SSA-GFET biosensor has a low detection limit of 10 nM and a linear range of 10 nM to 3 μM to Cu(II). In addition to the excellent selectivity to Cu(II), the biosensor also showes the advantage of high recovery rate for detection of Cu(II) in real fish samples. Because of the detection characteristics of label-free SSA-GFET, it has great advantages in the field of food safety and environmental detection.
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Affiliation(s)
- Rongrong Wang
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Yong Cao
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Hao Qu
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China; Engineering Research Center of Bioprocess, Ministry of Education, Hefei University of Technology, Hefei, 230009, China.
| | - Yanbo Wang
- Key Laboratory for Food Microbial Technology of Zhejiang Province, Zhejiang Gongshang University, Hangzhou, 310035, China
| | - Lei Zheng
- School of Food and Biological Engineering, Hefei University of Technology, Hefei, 230009, China; Intelligent Interconnected Systems Laboratory of Anhui Province, Hefei University of Technology, Hefei, 230009, China.
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