Edinburgh Research Explorer

Transient dynamics during stress overshoots in binary colloidal glasses

Research output: Contribution to journalArticle

Related Edinburgh Organisations

Open Access permissions

Open

Documents

Original languageEnglish
Pages (from-to)6546-6555
Number of pages10
JournalSoft Matter
Volume10
Issue number34
DOIs
Publication statusPublished - 2014

Abstract

We investigate, using simultaneous rheology and confocal microscopy, the time-dependent stress response and transient single-particle dynamics following a step change in shear rate in binary colloidal glasses with large dynamical asymmetry and different mixing ratios. The transition from solid-like response to flow is characterised by a stress overshoot, whose magnitude is linked to transient superdiffusive dynamics as well as cage compression effects. These and the yield strain at which the overshoot occurs vary with the mixing ratio, and hence the prevailing caging mechanism. The yielding and stress storage are dominated by dynamics on different time and length scales, the short-time incage dynamics and the long-time structural relaxation respectively. These time scales and their relation to the characteristic time associated with the applied shear, namely the inverse shear rate, result in two different and distinct regimes of the shear rate dependencies of the yield strain and the magnitude of the stress overshoot.

    Research areas

  • HARD-SPHERE, SELF-DIFFUSION, SUSPENSIONS, BEHAVIOR, TRANSITION, DISPERSIONS, PARTICLES, MIXTURES, LIQUIDS, SHEAR

Download statistics

No data available

ID: 21294583