Observation of Brownian motion on the time scale of hydrodynamic interactions

M. H. Kao, A. G. Yodh, D. J. Pine

Research output: Contribution to journalArticlepeer-review


We resolve the mean square displacement of particles in concentrated suspensions during the first 20 ns of their motion, before hydrodynamic interactions between particles have had time to fully develop. Nevertheless, we find that the concentrated systems exhibit clear deviations from the isolated-particle theory. These deviations are well described by several scaled versions of the isolated particle theory. The measurements also demonstrate a new multiple-scattering photon correlation technique with ultrashort time resolution.

Original languageEnglish (US)
Pages (from-to)242-245
Number of pages4
JournalPhysical Review Letters
Issue number2
StatePublished - 1993

ASJC Scopus subject areas

  • General Physics and Astronomy


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