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    Yielding and fracturing of concentrated emulsions in narrow gaps

    Access Status
    Fulltext not available
    Authors
    Whitby, C.
    McVicker, R.
    Connor, J.
    Sedev, Rossen
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Whitby, C. and McVicker, R. and Connor, J. and Sedev, R. 2013. Yielding and fracturing of concentrated emulsions in narrow gaps. Soft Matter. 9 (25): pp. 5975-5981.
    Source Title
    Soft Matter
    DOI
    10.1039/c3sm50314c
    ISSN
    1744-683X
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/54608
    Collection
    • Curtin Research Publications
    Abstract

    We used rheology and confocal microscopy techniques to characterise the flow of emulsions as the droplets were confined by increasing the drop volume fraction and reducing the distance between the shearing surfaces. Slip was minimised by matching the density of the oil and water phases. Attractive interactions between the drops caused them to flocculate. The contribution of the emulsion microstructure to its shear response becomes significant when the oil drop flocs almost span the distance between the surfaces. We found that confining the flow of droplet flocs causes a transition from a fluid phase with shear thinning flow behaviour into a jammed, solid-like material. The large deformations caused by flow at the maximum drop packing fraction induce droplet coalescence within highly localised regions of the emulsion.

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