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Shear Thinning Properties of Dense Suspensions: Rheology and Flow Dichroism

Published online by Cambridge University Press:  15 February 2011

Jonathan W. Bender  and
Norman J. Wagner
Jonathan W. Bender
Affiliation:
University of Delaware, Department of Chemical Engineering, Newark, DE 19716
Norman J. Wagner
Affiliation:
University of Delaware, Department of Chemical Engineering, Newark, DE 19716
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Abstract

An expression relating dichroism to the non-equilibrium structure was derived through Rayleigh-Gans light scattering theory. Comparison of this expression to a micromechanical expression for the thermodynamic contribution to the total stress demonstrates a stress-optical relationship. Optical dichroism and viscosity measurements on monodisperse, near hard-sphere suspensions as a function of shear rate, volume fraction, and particle size demonstrated the relationship experimentally. This work provides a rheo-optical method for determining the various contributions of the colloidal forces to the overall stress.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 289: Symposium M – Flow and Microstructure of Dense Suspensions , 1992 , 81
Copyright
Copyright © Materials Research Society 1993

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