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Elastic percolation transition in nanowire-based magnetorheological fluids

Appl. Phys. Lett. 95, 014102 (2009); doi:10.1063/1.3167815

Published 6 July 2009

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D. T. Zimmerman,1 R. C. Bell,1 J. A. Filer, II,1 J. O. Karli,1 and N. M. Wereley2
1The Pennsylvania State University, Altoona College 3000 Ivyside Park, Altoona, Pennsylvania 16601, USA
2Department of Aerospace Engineering, University of Maryland, College Park, Maryland 20742, USA
We observe an elastic percolation transition in the yield stress (tauy) 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. ©2009 American Institute of Physics
History: Received 20 April 2009; accepted 11 June 2009; published 6 July 2009
Permalink: http://link.aip.org/link/?APPLAB/95/014102/1
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KEYWORDS and PACS

Keywords
PACS
  • 64.60.ah
    Percolation studies of phase transitions
  • 75.80.+q
    Magnetomechanical and magnetoelectric effects, magnetostriction
  • 75.50.Cc
    Ferromagnetism of nonferrous metals and alloys
  • 81.40.Lm
    Deformation, plasticity, and creep
  • 62.20.fg
    Shape-memory effect; yield stress; superelasticity
  • 75.40.Cx
    Static properties of magnetic materials
  • 75.30.Kz
    Magnetic phase boundaries
  • 75.50.Mm
    Magnetic liquids
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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