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    Dynamic adsorption of a gemini surfactant at the air/water interface

    Access Status
    Fulltext not available
    Authors
    Nguyen, Van Cuong
    Nguyen, T.V.
    Phan, Chi
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Nguyen, V.C. and Nguyen, T.V. and Phan, C. 2015. Dynamic adsorption of a gemini surfactant at the air/water interface. Colloids and Surfaces A. 482: pp. 365-370.
    Source Title
    Colloids and Surfaces A
    Additional URLs
    http://dx.org/10.1016/j.colsurfa.2015.06.012
    ISSN
    0927-7757
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/35543
    Collection
    • Curtin Research Publications
    Abstract

    The adsorption of a gemini surfactant, α,ω-bis(N-alkyl dimethylammonium) alkane dibromides, at the air/water interface was investigated by tensiometry. Equilibrium and dynamic surface tension were modelled by a new modelling framework, which is not based on Gibbs adsorption isotherm. The method consistently predicted the dynamic surface tension at five different concentrations and circumvented the uncertainties around the ionic state of the gemini surfactants. It was found that the gemini surfactant had much higher surface affinity, which arose from the double tails, than that of the normal cationic surfactants. The maximum surface excess was consistent with the proposed orientation of gemini surfactant at the air/water interface. The modelling framework provides an effective and consistent method to characterize the interfacial adsorption of gemini surfactants.

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