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    Stabilising nanofluids in saline environments

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    Access Status
    Open access
    Authors
    Al-Anssari, S.
    Arif, M.
    Wang, Shaobin
    Barifcani, Ahmed
    Iglauer, Stefan
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Al-Anssari, S. and Arif, M. and Wang, S. and Barifcani, A. and Iglauer, S. 2017. Stabilising nanofluids in saline environments. Journal of Colloid and Interface Science. 508: pp. 222-229.
    Source Title
    Journal of Colloid and Interface Science
    DOI
    10.1016/j.jcis.2017.08.043
    ISSN
    0021-9797
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/57059
    Collection
    • Curtin Research Publications
    Abstract

    Nanofluids (i.e. nanoparticles dispersed in a fluid) have tremendous potential in a broad range of applications, including pharmacy, medicine, water treatment, soil decontamination, or oil recovery and CO 2 geo-sequestration. In these applications nanofluid stability plays a key role, and typically robust stability is required. However, the fluids in these applications are saline, and no stability data is available for such salt-containing fluids. We thus measured and quantified nanofluid stability for a wide range of nanofluid formulations, as a function of salinity, nanoparticle content and various additives, and we investigated how this stability can be improved. Zeta sizer and dynamic light scattering (DLS) principles were used to investigate zeta potential and particle size distribution of nanoparticle-surfactant formulations. Also scanning electron microscopy was used to examine the physicochemical aspects of the suspension. We found that the salt drastically reduced nanofluid stability (because of the screening effect on the repulsive forces between the nanoparticles), while addition of anionic surfactant improved stability. Cationic surfactants again deteriorated stability. Mecha nisms for the different behaviour of the different formulations were identified and are discussed here. We thus conclude that for achieving maximum nanofluid stability, anionic surfactant should be added.

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