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    A simple approximation for forces exerted on an AFM tip in liquid

    Access Status
    Fulltext not available
    Authors
    Watkins, M.
    Reischl, Bernhard
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Watkins, M. and Reischl, B. 2013. A simple approximation for forces exerted on an AFM tip in liquid. Journal of Chemical Physics. 138 (15).
    Source Title
    Journal of Chemical Physics
    DOI
    10.1063/1.4800770
    ISSN
    0021-9606
    School
    Nanochemistry Research Institute
    URI
    http://hdl.handle.net/20.500.11937/9779
    Collection
    • Curtin Research Publications
    Abstract

    The critical quantity in understanding imaging using an atomic force microscope is the force the sample exerts on the tip. We put forward a simple one-to-one force to water density relationship, explain exactly how it occurs, and in which circumstances it holds. We argue that two wide classes of atomic force microscope (AFM) tip should lead to at least qualitative agreement with our model and represent a significant fraction of AFM tips as currently prepared. This connection between the short-range force and the unperturbed equilibrium water density removes the need to perform simulations for each tip location, conservatively speeding up simulations by around three orders of magnitude compared to current methods that explicitly calculate the force on a tip model at each point in space. © 2013 AIP Publishing LLC.

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