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Effect of mechanical abrasion in polar-molecularelectrorheological fluids

Published online by Cambridge University Press:  04 November 2009

X. F. Wu ,
L. W. Zhou  and
J. P. Huang
X. F. Wu
Affiliation:
Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, P.R. China
L. W. Zhou*
Affiliation:
Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, P.R. China
J. P. Huang
Affiliation:
Department of Physics and Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, P.R. China
*
[email protected] [email protected]
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Abstract

Mechanical abrasion is a phenomenon which commonly occurs during the application of polar-molecular electrorheological (PMER) fluids. We experimentally investigate its effect by milling PMER particles for different times. We find that this effect can significantly reduce electrorheological effects of PMER fluids made of butyrolactone-modified TiO2 particles. This reduction results from the reduced interaction between PMER particles due to the loss of polar molecules on the surface of TiO2 particles. It is further revealed that adding proper amount of suitable polar molecules to the host fluid may compensate for the reduction of yield stress which can be about 100% at high electric fields.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 48 , Issue 3 , December 2009 , 31301
Copyright
© EDP Sciences, 2009

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Here the “1,4-butyrolactone” means the additional one. On the other hand, the small amount of 1,4-butyrolactone molecules peeled off due to milling (except for those evaporated) can be freely suspended in the PMER system as well. However, our experiment already implies that this amount has no evident role on the enhancement of yield stress, see the experimental data represented by circles in Figure [SEE TEXT]