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Shear Banding and Flow-Concentration Coupling in Colloidal Glasses

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Original languageEnglish
Article number268301
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume105
Issue number26
DOIs
Publication statusPublished - 20 Dec 2010

Abstract

We report experiments on hard-sphere colloidal glasses that show a type of shear banding hitherto unobserved in soft glasses. We present a scenario that relates this to an instability due to shear-concentration coupling, a mechanism previously thought unimportant in these materials. Below a characteristic shear rate (gamma)over dot(c) we observe increasingly nonlinear and localized velocity profiles. We attribute this to very slight concentration gradients in the unstable flow regime. A simple model accounts for both the observed increase of (gamma)over dot(c) with concentration, and the fluctuations in the flow.

    Research areas

  • INHOMOGENEOUS FLOW, COMPLEX FLUIDS, RHEOLOGY, SUSPENSIONS, PRESSURE, LIQUIDS, FOAMS

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