Nonlinear microrheology of wormlike micelle solutions using ferromagnetic nanowire probes

Nathan Cappallo, Clayton Lapointe, Daniel H. Reich, and Robert L. Leheny
Phys. Rev. E 76, 031505 – Published 27 September 2007

Abstract

Ferromagnetic nanowires were employed to investigate the microrheology of wormlike micelle solutions composed of equimolar cetylpyridinium chloride–sodium salicylate. For a wire rotated about a short axis, the drag at low rotation rate ωR is independent of ωR and strongly temperature dependent, consistent with the macroscopic shear viscosity. Above a critical rotation rate ωc, the drag is independent of temperature and decreases as a power law with increasing rate. The onset of nonlinear drag is characterized by a peak associated with contributions from extensional flow. Above ωc, the fluid generates an additional torque that tilts the wire out of regions of high shear flow and that is interpreted as a consequence of a shear-induced transition to nematic order among the micelles. Rotation of the wire in response to this torque reveals directly the anisotropy of the drag in the nonlinear state.

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  • Received 10 April 2007

DOI:https://doi.org/10.1103/PhysRevE.76.031505

©2007 American Physical Society

Authors & Affiliations

Nathan Cappallo, Clayton Lapointe, Daniel H. Reich, and Robert L. Leheny

  • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA

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Issue

Vol. 76, Iss. 3 — September 2007

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