Elastic percolation transition in nanowire-based magnetorheological fluids

Zimmerman, D. T.; Bell, R. C.; Filer, J. A.; Karli, J. O.; Wereley, N. M.
July 2009
Applied Physics Letters;7/6/2009, Vol. 95 Issue 1, p014102
Academic Journal
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.


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