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    Relative contribution of cationic surfactant and counter-anion to a liquid film tension

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    Authors
    Phan, Chi
    Haseeb, M.
    Date
    2020
    Type
    Journal Article
    
    Metadata
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    Citation
    Phan, C.M. and Haseeb, M. 2020. Relative contribution of cationic surfactant and counter-anion to a liquid film tension. Journal of Molecular Liquids. 306: Article No 112802.
    Source Title
    Journal of Molecular Liquids
    DOI
    10.1016/j.molliq.2020.112802
    ISSN
    0167-7322
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/79505
    Collection
    • Curtin Research Publications
    Abstract

    A model was developed to predict the bubble deformation in the presence of a charged surface. The model was successfully verified with a bubble containing a cationic surfactant, cetyltrimethylammonium bromide. The modelling results revealed that the film tension linearly increased with the distance from the charged surface, due to the electrostatic repulsion of the anions. More importantly, the analysis demonstrated that hydrated Br− increased film tension, whereas surfactant molecules reduced film tension. The anion's increment was estimated at ~14% of the surfactant's reduction. The results verified the contrasting influences of surfactant and its counter-ions on the tension of the air/liquid interfacial layer.

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