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Issue 18, 2011
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Electrorheological response of dense strontium titanyl oxalate suspensions

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Abstract

In suspensions of polarizable particles the addition of polar molecules can dramatically increase the yield stress under an applied electric field, leading to a giant electrorheological (GER) effect. We report experiments on dense suspensions of strontium titanyl oxalate in silicon oil, where we find a yield stress of up to 200kPa at 5kV/mm. The magnitude of this yield stress directly correlates with the water content in the particles. In the dynamic response we observe behavior not previously reported for GER fluids and similar to sheared granular materials, including a direct proportionality between shear and normal stresses and the creation of a shear band a few particles in width. An important consequence is that the dynamic response can be varied dramatically by changing the confinement of the suspension or by imposing a normal stress.

Graphical abstract: Electrorheological response of dense strontium titanyl oxalate suspensions

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Article information


Submitted
01 Apr 2011
Accepted
03 Jun 2011
First published
29 Jun 2011

Soft Matter, 2011,7, 8023-8029
Article type
Paper

Electrorheological response of dense strontium titanyl oxalate suspensions

C. S. Orellana, J. He and H. M. Jaeger, Soft Matter, 2011, 7, 8023
DOI: 10.1039/C1SM05565H

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