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Electrorheological Fluids: Structure Formation, Relaxation, and Destruction

Published online by Cambridge University Press:  25 February 2011

Thomas C. Halsey
Thomas C. Halsey*
Affiliation:
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637
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Abstract

In a strong electric field, the qualitative behavior of electrorheological fluids is dominated by the dipolar interactions between the colloidal particles. When thermal effects can be ignored, the ground state of a system of dipolar particles is an ordered solid. However, long-range ordered structures are rarely seen in experiment. When a high electric field is applied to a fluid, dielectric columns oriented parallel to the field rapidly form. The relaxation of these columns is a much slower process. I calculate the shape of the columns formed and the time scale for the relaxation of the columnar structure. I also discuss how this structure formation is altered in the presence of a shear flow.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 248: Symposium O – Complex Fluids , 1991 , 217
Copyright
Copyright © Materials Research Society 1992

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