Shear banding and flow-concentration coupling in colloidal glasses.

@article{Besseling2010ShearBA,
  title={Shear banding and flow-concentration coupling in colloidal glasses.},
  author={Rut Besseling and Lucio Isa and Pierre Ballesta and George Petekidis and Michael E Cates and W. C. Poon},
  journal={Physical review letters},
  year={2010},
  volume={105 26},
  pages={268301}
}
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 γ(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… CONTINUE READING

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