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The role of the dispersed-phase remnant magnetization on the redispersibility of magnetorheological fluids

Published online by Cambridge University Press:  31 January 2011

Pradeep P. Phulé ,
Matthew P. Mihalcin  and
Seval Genc
Pradeep P. Phulé
Affiliation:
Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
Matthew P. Mihalcin
Affiliation:
Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
Seval Genc
Affiliation:
Department of Materials Science and Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
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Abstract

The influence of the remnant magnetization of the soft magnetic particulates, used as a dispersed phase, on the redispersibility of magnetorheological (MR) fluids is discussed. Calculations of the magnetic interaction energy showed that for 33-vol% MR fluids based on particles of iron (∼6 μm), manganese zinc ferrite (∼2.3 μm), and nickel zinc ferrite (∼2.1 μm), the ratios of the magnetic interaction energy to the thermal energy were 161,000, 6400, and 3900, respectively. These calculations showed that even the seemingly small levels of remnant magnetization, associated with particulates employed in MR fluids, introduced significant dipole–dipole interparticle interactions. It is proposed that this interaction causes most MR fluids to show a tendency for “cake formation,” which makes it difficult to redisperse these fluids. Our modeling presented here also suggests practical strategies to enhance the redispersibility of MR fluids.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 7 , July 1999 , pp. 3037 - 3041
Copyright
Copyright © Materials Research Society 1999

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