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, C. F. Schmidt

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

23 Citations (Scopus)

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.

Original languageEnglish
Article number061508
JournalPhysical Review E: Statistical, Nonlinear, and Soft Matter Physics
Volume77
Issue number6
DOIs
Publication statusPublished - 18 Jun 2008

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