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    Mechanical properties of molecularly thin lubricant layers: experimental methods and procedures

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    Authors
    Becker, Thomas
    Mugele, F.
    Date
    2005
    Type
    Journal Article
    
    Metadata
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    Citation
    Becker, T. and Mugele, F. 2005. Mechanical properties of molecularly thin lubricant layers: experimental methods and procedures. Journal of Physics: Condensed Matter. 17: pp. S319-S332.
    Source Title
    Journal of Physics: Condensed Matter
    DOI
    10.1088/0953-8984/17/9/004
    ISSN
    0953-8984
    URI
    http://hdl.handle.net/20.500.11937/38229
    Collection
    • Curtin Research Publications
    Abstract

    We present a new experimental set-up and experimental strategies designed for investigating dynamic processes in molecularly thin lubricant layers. The experimental set-up is an extension of a conventional surface forces apparatus, which allows for two-dimensional imaging of the thickness of liquid layers confined between two atomically smooth mica surfaces. We present details of amica surface preparation technique that eliminates otherwise frequently encountered contamination of the surfaces with nanoparticles, which were recently shown to affect surface forces measurements. Multiple-beam interferometry results in a thickness resolution of approximately 0.2 nm. The data analysis relies on fitting of numerically calculated optical transmission spectra of asymmetric multilayer Fabry–Perot interferometers. The lateral resolution and time resolution are determined by the optical resolution of the video microscopy and the frame rate of the digital CCD camera, respectively. Furthermore, we summarize several results and new insights into the collapse dynamics of thin lubricant layers that were obtained with this technique.

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