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Structural arrest and dynamic localization in biocolloidal gels

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Abstract

Casein micelles interacting via an entropic intermediate-ranged depletion attraction exhibit a fluid-to-gel transition due to arrested spinodal decomposition. The bicontinuous networked structure of the gel freezes shortly after formation. We determine the timescales of structural arrest from the build-up of network rigidity after pre-shear rejuvenation, and find that the arrest time as well as the plateau elastic modulus of the gel diverge as a function of the volume fraction and interaction potential. Moreover, we show using scaling from naïve mode coupling theory that their mechanical properties are dictated by their microscopic dynamics rather than their heterogeneous large scale structure.

Graphical abstract: Structural arrest and dynamic localization in biocolloidal gels

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Publication details

The article was received on 10 Mar 2017, accepted on 03 Jun 2017 and first published on 07 Jun 2017


Article type: Paper
DOI: 10.1039/C7SM00496F
Citation: Soft Matter, 2017, Advance Article
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    Structural arrest and dynamic localization in biocolloidal gels

    N. Mahmoudi and A. Stradner, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM00496F

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