Microrheology Probes Length Scale Dependent Rheology

J. Liu, M. L. Gardel, K. Kroy, E. Frey, B. D. Hoffman, J. C. Crocker, A. R. Bausch, and D. A. Weitz
Phys. Rev. Lett. 96, 118104 – Published 23 March 2006

Abstract

We exploit the power of microrheology to measure the viscoelasticity of entangled F-actin solutions at different length scales from 1 to 100μm over a wide frequency range. We compare the behavior of single probe-particle motion to that of the correlated motion of two particles. By varying the average length of the filaments, we identify fluctuations that dissipate diffusively over the filament length. These provide an important relaxation mechanism of the elasticity between 0.1 and 30rad/sec.

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  • Received 1 October 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.118104

©2006 American Physical Society

Authors & Affiliations

J. Liu1, M. L. Gardel1,*, K. Kroy2, E. Frey3, B. D. Hoffman4, J. C. Crocker4, A. R. Bausch5, and D. A. Weitz1

  • 1Dept. of Physics & DEAS, Harvard University, Cambridge, Massachusetts 02138, USA
  • 2ITP, Universität Leipzig, D-04103 Leipzig, Germany
  • 3Ludwig-Maximilians-Universität, München, Germany
  • 4Dept. of Chemical Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
  • 5Physik-Dept E22, Technische Universität München, D-85748 Garching, Germany

  • *Present address: Department of Cell Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

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Vol. 96, Iss. 11 — 24 March 2006

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