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    Dynamic wetting of a fluoropolymer surface by ionic liquids

    Access Status
    Fulltext not available
    Authors
    Li, H.
    Sedev, Rossen
    Ralston, J.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Li, H. and Sedev, R. and Ralston, J. 2011. Dynamic wetting of a fluoropolymer surface by ionic liquids. Physical Chemistry Chemical Physics. 13 (9): pp. 3952-3959.
    Source Title
    Physical Chemistry Chemical Physics
    DOI
    10.1039/c0cp02035d
    ISSN
    1463-9076
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/53659
    Collection
    • Curtin Research Publications
    Abstract

    The spontaneous spreading of ionic liquids on a fluoropolymer surface (Teflon AF1600) in air is investigated by high-speed video microscopy. Six ionic liquids (EMIM BF4, BMIM BF4, OMIM BF4, EMIM NTf2, BMIM NTf2 and HMIM NTf2) are used as probe liquids. The dependence of the dynamic contact angle on contact line velocity is interpreted with a hydrodynamic model and a molecular-kinetic model. The usefulness of the hydrodynamic model is rather limited. There is a good correspondence between the molecular dimensions of the liquids and the physical parameters of the molecular-kinetic model. The viscous and molecular-kinetic contributions to energy dissipation are calculated, revealing that energy is dissipated in the bulk as well as at the contact line during dynamic wetting. There are wide ramifications of these results in areas ranging from lubrication and biology to minerals processing and petroleum recovery.

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