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    Nanofluidics: Molecularly thin lubricant layers under confinement

    Access Status
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    Authors
    Becker, Thomas
    Mugele, F.
    Date
    2005
    Type
    Journal Article
    
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    Citation
    Becker, T. and Mugele, F. 2005. Nanofluidics: Molecularly thin lubricant layers under confinement. Molecular Simulation. 31: pp. 489-494.
    Source Title
    Molecular Simulation
    DOI
    10.1080/08927020412331337069
    ISSN
    08927022
    URI
    http://hdl.handle.net/20.500.11937/24378
    Collection
    • Curtin Research Publications
    Abstract

    Confined liquid films with a thickness in the range of a few molecular diameters exhibit different mechanical properties than in the bulk.With the technique of a 2-dimensional (2D) imaging surface forces apparatus (SFA) we investigated in detail the layer by layer thinning of a thin liquid film confined between two atomically smooth surfaces upon pressing them towards each other with increasing load. The dynamics of a series of subsequent squeeze-out processes of individual layers were analyzed. Using a simple hydrodynamic model, we extracted the thickness-dependence of the viscosity. For the system investigated here—the model lubricant Octamethylcyclotetrasiloxane (OMCTS) confined between ultraclean, recleaved mica surfaces—we found that the viscosity increased by a factor of 10 with decreasing the film thickness from 6 to 2 layers. We decomposed the friction into two components, one describing the sliding of liquid layers on top of the substrates, and the other describing liquid-on-liquid sliding. The latter contribution was found to agree closely with expectations based on the bulk viscosity, whereas the former was approximately 35 times higher for the present system.

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