Influence of hydrodynamic interactions on long-time diffusion in charge-stabilized colloids

G. Nägele; P. Baur

doi:10.1209/epl/i1997-00283-5

All issues

Volume 38 / No 7 (June I 1997)

Europhys. Lett., 38 7 (1997) 557-562

Abstract

Issue		Europhys. Lett. Volume 38, Number 7, June I 1997


Page(s)		557 - 562
Section		Cross-disciplinary physics and related areas of science and technology
DOI		https://doi.org/10.1209/epl/i1997-00283-5
Published online		01 September 2002

Europhys. Lett., 38 (7), pp. 557-562 (1997)

Influence of hydrodynamic interactions on long-time diffusion in charge-stabilized colloids

G. Nägele and P. Baur

Fakultät für Physik, Universität Konstanz - Postfach 5560, D-78434 Konstanz, Germany

Received: 23 January 1997
Accepted: 21 April 1997

Abstract

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 ${\mit\Delta}(q)$ and the long-time self-diffusion coefficient $D_{\rm s}^{\rm L}$ . Both quantities are calculated by constructing a novel mode-coupling scheme which accounts for HI. Our results for ${\mit\Delta} (q)$ compare well with experimental data. HI are found to reduce ${\mit\Delta}(q)$ , and to give rise to an unexpected enhancement of $D_{\rm s}^{\rm L}$ . 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

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