Small-Amplitude AFM Spectroscopy of Dissipation in Confined Liquid Films


Beer, Sissi de and Mugele, Frieder (2009) Small-Amplitude AFM Spectroscopy of Dissipation in Confined Liquid Films. Microscopy and Analysis, 23 (1). pp. 11-14. ISSN 0958-1952

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Abstract:The properties of confined liquids are of fundamental interest for understanding the limitations of conventional continuum hydrodynamics on small scales. In this article we present accurate measurements of oscillatory solvation forces that arise due to confinement of octamethylcyclotetrasiloxane between an AFM tip and a highly oriented pyrolytic graphite (HOPG) surface. To measure these forces the cantilever was driven at a very small amplitude (<<1 nm) with a home-built cantilever holder. We discuss several models that can be used to extract conservative and dissipative forces from the amplitude and phase distance curves.
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Copyright:© 2009 Wiley
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