Short-time inertial response of viscoelastic fluids measured with Brownian motion and with active probes

M. Atakhorrami, D. Mizuno, G. H. Koenderink, T. B. Liverpool, F. C. MacKintosh, and C. F. Schmidt
Phys. Rev. E 77, 061508 – Published 18 June 2008

Abstract

We have directly observed short-time stress propagation in viscoelastic fluids using two optically trapped particles and a fast interferometric particle-tracking technique. We have done this both by recording correlations in the thermal motion of the particles and by measuring the response of one particle to the actively oscillated second particle. Both methods detect the vortexlike flow patterns associated with stress propagation in fluids. This inertial vortex flow propagates diffusively for simple liquids, while for viscoelastic solutions the pattern spreads superdiffusively, depending on the shear modulus of the medium.

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  • Received 22 February 2008

DOI:https://doi.org/10.1103/PhysRevE.77.061508

©2008 American Physical Society

Authors & Affiliations

M. Atakhorrami1,2, D. Mizuno1,3, G. H. Koenderink1,4, T. B. Liverpool5,6,7, F. C. MacKintosh1,6, and C. F. Schmidt1,8

  • 1Department of Physics and Astronomy, Vrije Universiteit, 1081HV Amsterdam, The Netherlands
  • 2Philips Research, 5656AE Eindhoven, The Netherlands
  • 3Organization for the Promotion of Advanced Research, Kyushu University, 812-0054 Fukuoka, Japan
  • 4FOM Institute AMOLF, 1098SJ Amsterdam, The Netherlands
  • 5Department of Applied Mathematics, University of Leeds, Leeds, LS2 9JT, United Kingdom
  • 6Isaac Newton Institute for Mathematical Sciences, University of Cambridge, Cambridge, CB3 0EH, United Kingdom
  • 7Department of Mathematics, University of Bristol, Bristol BS8 1TW, United Kingdom
  • 8Fakultät für Physik, Georg-August-Universität, 37077 Göttingen, Germany

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Issue

Vol. 77, Iss. 6 — June 2008

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