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    Nanoroughness impact on liquid-liquid displacement

    Access Status
    Fulltext not available
    Authors
    Ramiasa, M.
    Ralston, J.
    Fetzer, R.
    Sedev, Rossen
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Ramiasa, M. and Ralston, J. and Fetzer, R. and Sedev, R. 2012. Nanoroughness impact on liquid-liquid displacement. Journal of Physical Chemistry C. 116 (20): pp. 10934-10943.
    Source Title
    Journal of Physical Chemistry C
    DOI
    10.1021/jp2120274
    ISSN
    1932-7447
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/54620
    Collection
    • Curtin Research Publications
    Abstract

    The influence of surface nanoroughness on the static and dynamic behavior of a solid-water-dodecane contact line is investigated. Surface roughness is found to affect the substrate static and dynamic wettability for root-mean-square roughnesses below 7 nm. The kinetics of liquid-liquid displacement is slowed down drastically by the nanoroughness. Nevertheless, contact line motion is found to be governed by a thermally activated process. This process is not based on a pure molecular adsorption-desorption mechanism. Instead, two different nanoscale local displacements mechanisms occurring in the vicinity of the contact line may account for the thermally activated dynamics: we suggest that both molecular adsorption-desorption processes and contact line pinning on nanodefects play significant roles in controlling water displacement by dodecane on surfaces which are rough at the nanoscale.

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