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Issue 13, 2016
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A relationship between three-dimensional surface hydration structures and force distribution measured by atomic force microscopy

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Abstract

Hydration plays important roles in various solid–liquid interfacial phenomena. Very recently, three-dimensional scanning force microscopy (3D-SFM) has been proposed as a tool to visualise solvated surfaces and their hydration structures with lateral and vertical (sub) molecular resolution. However, the relationship between the 3D force map obtained and the equilibrium water density, ρ(r), distribution above the surface remains an open question. Here, we investigate this relationship at an interface of an inorganic mineral, fluorite, and water. The force maps measured in pure water are directly compared to force maps generated using the solvent tip approximation (STA) model and from explicit molecular dynamics simulations. The results show that the simulated STA force map describes the major features of the experimentally obtained force image. The agreement between the STA data and the experiment establishes the correspondence between the water density used as an input to the STA model and the experimental hydration structure and thus provides a tool to bridge the experimental force data and atomistic solvation structures. Further applications of this method should improve the accuracy and reliability of both interpretation of 3D-SFM force maps and atomistic simulations in a wide range of solid–liquid interfacial phenomena.

Graphical abstract: A relationship between three-dimensional surface hydration structures and force distribution measured by atomic force microscopy

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Publication details

The article was received on 16 Nov 2015, accepted on 03 Mar 2016 and first published on 04 Mar 2016


Article type: Paper
DOI: 10.1039/C5NR08092D
Citation: Nanoscale, 2016,8, 7334-7342
  • Open access: Creative Commons BY-NC license
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    A relationship between three-dimensional surface hydration structures and force distribution measured by atomic force microscopy

    K. Miyazawa, N. Kobayashi, M. Watkins, A. L. Shluger, K. Amano and T. Fukuma, Nanoscale, 2016, 8, 7334
    DOI: 10.1039/C5NR08092D

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