Shear Excitation of Confined Colloidal Suspensions

Details Shear Excitation of Confined Colloidal Suspensions Shear Excitation of Confined Colloidal Suspensions

2004-09-06

arxiv.org/abs/cond-mat/0409114v1

PHYS. REV. LETT. Vol 93, 046001 (2004)

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.046001

We show that geometric confinement dramatically affects the shear-induced configurations of dense mono-disperse colloidal suspensions; a new structure emerges, where layers of particles buckle to stack in a more efficient packing. The volume fraction in the shear zone is controlled by a balance between the viscous stresses and the osmotic pressure of a contacting reservoir of unsheared particles. We present a model that accounts for our observations and helps elucidate the complex interplay between particle packing and shear stress for confined suspensions.

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