Professor Kislon Voitchovsky kislon.voitchovsky@durham.ac.uk
Professor
Solid-liquid interfaces are central to nanoscale science and technology and control processes as diverse as self-assembly, heterogeneous catalysis, wetting, electrochemistry, or protein function. Experimentally, measuring the structure and dynamics of solid-liquid interfaces with molecular resolution remains a challenge. This task can, in principle, be achieved with atomic force microscopy (AFM), which functions locally, and with nanometer precision. When operated dynamically and at small amplitudes, AFM can provide molecular-level images of the liquid solvation layers at the interfaces. At larger amplitudes, results in the field of multifrequency AFM have shown that anharmonicities in the tip motion can provide quantitative information about the solid's mechanical properties. The two approaches probe opposite aspects of the interface and are generally seen as distinct. Here it is shown that, for amplitudes Ad, the tip trajectory becomes rapidly anharmonic due to the tip tapping the solid, and the resolution decreases. A nonlinear transition between the two regimes occurs for A∼d and can be quantified with the second harmonic of the tip oscillation. These results, confirmed by computer simulations, remain valid in most experimental conditions. Significantly, they provide an objective criterion to enhance resolution and to decide whether the results are dominated by the properties of the solid or of the liquid.
Voïtchovsky, K. (2013). Anharmonicity, solvation forces, and resolution in atomic force microscopy at the solid-liquid interface. Physical review E: Statistical, nonlinear, and soft matter physics, 88(2), Article 022407. https://doi.org/10.1103/physreve.88.022407
Journal Article Type | Article |
---|---|
Publication Date | Aug 1, 2013 |
Deposit Date | Oct 16, 2013 |
Publicly Available Date | Jul 11, 2014 |
Journal | Physical review . E, Statistical, nonlinear, and soft matter physics |
Print ISSN | 1539-3755 |
Electronic ISSN | 1550-2376 |
Publisher | American Physical Society |
Peer Reviewed | Peer Reviewed |
Volume | 88 |
Issue | 2 |
Article Number | 022407 |
DOI | https://doi.org/10.1103/physreve.88.022407 |
Public URL | https://durham-repository.worktribe.com/output/1468146 |
Published Journal Article
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Copyright Statement
Reprinted with permission from the American Physical Society: Phys. Rev. E 88, 022407 © (2013) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
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