SCALING OF THE TIME-DEPENDENT SELF-DIFFUSION COEFFICIENT

The advent of the new light scattering technique of Diffusing Wave Spe ctroscopy has aroused great interest on the very short time scale dyna mics of colloidal particles in suspension. Here we review some advance s in the experimental, computer simulation and theoretical fronts on t he problem of the dynamics of Brownian particles at time scales where hydrodynamic transient effects become very important. We also present some open questions regarding the scaling of the time-dependent self-d iffusion coefficient and propose possible ways of attacking them.