Shear banding and flow-concentration coupling in colloidal glasses

Details Shear banding and flow-concentration coupling in colloidal glasses Shear banding and flow-concentration coupling in colloidal glasses

2010-09-08

arxiv.org/abs/1009.1579v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

We report experiments on hard sphere colloidal glasses that reveal a type of shear banding hitherto unobserved in soft glasses. We present a scenario that relates this to an instability arising from shear-concentration coupling, a mechanism previously thought unimportant in this class of materials. Below a characteristic shear rate $\dot\gamma_c$ we observe increasingly non-linear velocity profiles and strongly localized flows. We attribute this trend to very slight concentration gradients (likely to evade direct detection) arising in the unstable flow regime. A simple model accounts for both the observed increase of $\dot\gamma_c$ with concentration, and the fluctuations observed in the flow.

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