Shear-Induced Configurations of Confined Colloidal Suspensions

 
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Cohen, Itai
Mason, Thomas G.
Weitz, David A.
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https://doi.org/10.1103/PhysRevLett.93.046001
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Cohen, Itai, Thomas G. Mason, and David A. Weitz. 2004. “Shear-Induced Configurations of Confined Colloidal Suspensions.” Physical Review Letters93 (4): 046001. https://doi.org/10.1103/PhysRevLett.93.046001.
Abstract
We show that geometric confinement dramatically affects the shear-induced configurations of dense monodisperse 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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