Influence of hydrodynamic interactions on long-time diffusion in charge-stabilized colloids
Fakultät für Physik, Universität Konstanz - Postfach 5560, D-78434 Konstanz, Germany
Accepted: 21 April 1997
We study the influence of hydrodynamic interactions (HI) on the dynamic structure factor S(q,t) and self-diffusion of charged colloids as quantified, respectively, by the non-exponentiality factor and the long-time self-diffusion coefficient . Both quantities are calculated by constructing a novel mode-coupling scheme which accounts for HI. Our results for compare well with experimental data. HI are found to reduce , and to give rise to an unexpected enhancement of . Our results clearly demonstrate the importance of HI at volume fractions even as low as 10-3.
PACS: 82.70.Dd – Colloids / 05.20.-y – Statistical mechanics / 05.40.+j – Fluctuation phenomena, random processes, and Brownian motion
© EDP Sciences, 1997