Particle tracking microrheology of complex fluids

T. G. Mason, K. Ganesan, J. H. Van Zanten, D. Wirtz, S. C. Kuo

Research output: Contribution to journalArticlepeer-review

633 Scopus citations


We present a new method for measuring the linear viscoelastic shear moduli of complex fluids. Using photodiode detection of laser light scattered from a thermally excited colloidal probe sphere, we track its trajectory and extract the moduli using a frequency-dependent Stokes-Einstein equation. Spectra obtained for polyethylene oxide in water are in excellent agreement with those found mechanically and using diffusing wave spectroscopy. Since only minute sample volumes are required, this method is well suited for biomaterials of high purity, as we demonstrate with a concentrated DNA solution.

Original languageEnglish (US)
Pages (from-to)3282-3285
Number of pages4
JournalPhysical Review Letters
Issue number17
StatePublished - 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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