Abstract

Diffusion of tracer spheres in dispersions of rods is measured by dynamic light scattering (DLS) and fluorescence correlation spectroscopy (FCS), as a function of the rod concentration and the size ratio of the sphere to the rod. By comparing with DLS, FCS is shown to measure long-time diffusion only for relatively small spheres. A variational approach for the prediction of long-time self diffusion coefficients is compared with experiments.

© 2004 Optical Society of America