Structural arrest and dynamic localization in biocolloidal gels

Research output: Contribution to journalArticle

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.

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Authors
Organisations
External organisations
  • University of Fribourg
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Chemistry
Original languageEnglish
Pages (from-to)4629-4635
Number of pages7
JournalSoft Matter
Volume13
Issue number26
Publication statusPublished - 2017
Publication categoryResearch
Peer-reviewedYes