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Issue 19, 2016
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Compressing a spinodal surface at fixed area: bijels in a centrifuge

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Abstract

Bicontinuous interfacially jammed emulsion gels (bijels) are solid-stabilised emulsions with two inter-penetrating continuous phases. Employing the method of centrifugal compression we find that macroscopically the bijel yields at relatively low angular acceleration. Both continuous phases escape from the top of the structure, making any compression immediately irreversible. Microscopically, the bijel becomes anisotropic with the domains aligned perpendicular to the compression direction which inhibits further liquid expulsion; this contrasts strongly with the sedimentation behaviour of colloidal gels. The original structure can, however, be preserved close to the top of the sample and thus the change to an anisotropic structure suggests internal yielding. Any air bubbles trapped in the bijel are found to aid compression by forming channels aligned parallel to the compression direction which provide a route for liquid to escape.

Graphical abstract: Compressing a spinodal surface at fixed area: bijels in a centrifuge

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Publication details

The article was received on 21 Jan 2016, accepted on 04 Apr 2016 and first published on 05 Apr 2016


Article type: Paper
DOI: 10.1039/C6SM00168H
Soft Matter, 2016,12, 4375-4383

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    Compressing a spinodal surface at fixed area: bijels in a centrifuge

    K. A. Rumble, J. H. J. Thijssen, A. B. Schofield and P. S. Clegg, Soft Matter, 2016, 12, 4375
    DOI: 10.1039/C6SM00168H

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