Session G7: Shear-Induced Patterns in Complex Fluids and Granular Matter
8:00 AM–11:00 AM, Tuesday, March 14, 2006
Baltimore Convention Center Room: 307
Sponsoring Unit:
GSNP
Chair: David Weitz, Harvard University
Abstract ID: BAPS.2006.MAR.G7.4
Abstract: G7.00004 : Shear banding in complex fluids: Hints from colloidal crystals
9:48 AM–10:24 AM
Preview Abstract
MathJax On | Off 
Abstract 
Author:
Benny Davidovitch
(Harvard University )
When sheared out of equilibrium, a variety of complex fluids exhibit an unusual behavior, where bands of high and low shear rates are spontaneously formed. This phenomenon is typically attributed to a nonlinear material rheology. In this talk I will describe a similar phenomenon observed in oscillatory shear experiment on dense colloidal crystal, where the data reflect a linear, rather than nonlinear material rheology. This observation suggests an alternative mechanism for shear banding, as a coexistence under nonequilibrium conditions between two linearly responding phases of a complex fluid. Some consequences will be discussed, such as the singular role played by near-wall pure solvent layers, and possible nonequilibrium mechanisms for selection of the observed band width.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.G7.4