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    An unusual synergistic adsorption of MIBC and CTAB mixtures at the air–water interface

    Access Status
    Fulltext not available
    Authors
    Le, Ngoc Thu
    Phan, Chi
    Nguyen, A.
    Ang, Ming
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Le, N.T. and Phan, C. and Nguyen, A. and Ang, M. 2012. An unusual synergistic adsorption of MIBC and CTAB mixtures at the air–water interface. Minerals Engineering. 39: pp. 255-261.
    Source Title
    Minerals Engineering
    DOI
    10.1016/j.mineng.2012.06.003
    ISSN
    0892-6875
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/43706
    Collection
    • Curtin Research Publications
    Abstract

    Flotation collectors and frothers are known to synergistically adsorb at the air–water interface and reduce surface tension. Here we report an unusual synergistic adsorption of cetyl trimethyl ammonium bromide (CTAB) and methyl isobutyl carbinol (MIBC), which unexpectedly increase surface tension. The available models fail to describe the unusual increase in surface tension. A polynomial was used to empirically model the increased surface tension over entire range of mixture concentration and identify the synergistic line. The ratio of MIBC to CTAB bulk concentrations of the synergistic adsorption was greater than 100. However, the synergistic ratio of adsorbed concentrations, assuming no interaction between adsorbed molecules, varied from 2 to 5. The synergistic line can be explained by the existence of two molecular arrangements at the surface: one is dominated by MIBC and the other is dominated by CTAB. The dividing line is sharply distinguished for MIBC/CTAB systems due to the branched structure and relative position of hydrophobic group of MIBC. Mixtures of straight alcohol with CTAB show a smoother transition as previously reported in the literature. The synergism could be the underpinning principle for the superior performance of MIBC as a flotation frother.

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