The role of hydrodynamic interactions in colloidal electrolyte friction and sedimentation
Universität Konstanz, Fachbereich Physik - Postfach 5560,
D-78457 Konstanz, Germany
Corresponding author: email@example.com
Accepted: 15 September 2000
Based on a recently formulated mode coupling scheme for Brownian systems, new analytical expressions are derived for the time-resolved tracer-diffusion, electrolyte friction coefficient and sedimentation velocity of a colloidal macroion suspended in a many-component electrolyte solution. Use of these expressions yields good agreement with experimental data and Booth's theory of macroion sedimentation. Our theoretical expressions allow for a separate assessment of the influence of hydrodynamic and potential forces on the relaxation of the electrolyte atmosphere. Inclusion of hydrodynamic interactions (HI) effects is shown to be essential for a proper description of colloidal electrolyte friction and sedimentation.
PACS: 82.70.Dd – Colloids / 05.40.Jc – Brownian motion
© EDP Sciences, 2000