Role of water in atomic resolution AFM in solutions

Watkins, Matthew and Berkowitz, Max L. and Shluger, Alexander L. (2011) Role of water in atomic resolution AFM in solutions. Physical Chemistry Chemical Physics, 13 (27). pp. 12584-12594. ISSN 1463-9076

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Role of water in atomic resolution AFM in solutions

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Abstract

We use computer modelling to investigate the mechanism of atomic-scale corrugation in frequency modulation atomic force microscopy imaging of inorganic surfaces in solution. Molecular dynamics simulations demonstrate that the forces acting on a model microscope tip result from the direct interaction between a tip and a surface, and forces entirely due to the water structure around both tip and surface. The observed force is a balance between largely repulsive potential energy changes as the tip approaches and the entropic gain when water is sterically prevented from occupying sites near the tip and surface. Only extremely sharp tips are likely to measure direct tip-surface interactions. An investigation into the dynamics of water confined between tip and surface shows that water diffusion can be slowed by at least two orders of magnitude compared to its rate in bulk solution. © the Owner Societies 2011.

Keywords:water, article, atomic force microscopy, chemistry, molecular dynamics, physiology, solution and solubility, surface property, Microscopy, Atomic Force, Molecular Dynamics Simulation, Solutions, Surface Properties, Water
Subjects:F Physical Sciences > F170 Physical Chemistry
F Physical Sciences > F320 Chemical Physics
Divisions:College of Science > School of Mathematics and Physics
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ID Code:17709
Deposited On:19 Jun 2015 08:51

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