Elastic percolation transition in nanowire-based magnetorheological fluids

D. T. Zimmerman, R. C. Bell, J. A. Filer, J. O. Karli, N. M. Wereley

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Abstract

We observe an elastic percolation transition in the yield stress (τy) of cobalt-nanowire magnetorheological fluids, with a critical volume fraction of ferromagnetic particles (pc) that increases with the applied magnetic field (H). Unlike studies of static percolation phenomena, our observations reveal percolation in a dynamic, fluid-semisolid system. The elastic critical exponent (f) appears to be independent of H, having a value in the range of 1.0-1.2, near that seen in various two-dimensional networks. The superelastic exponent (c) decreases with increasing H and is smaller than that seen in typical networks.

Original languageEnglish (US)
Article number014102
JournalApplied Physics Letters
Volume95
Issue number1
DOIs
StatePublished - Jul 20 2009

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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