Volume 72, Number 5, December 2005
|Page(s)||837 - 843|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||28 October 2005|
Electroosmosis at inhomogeneous charged surfaces
Physik Department, TU München - 85748 Garching, Germany
Accepted: 3 October 2005
The Helmholtz-Smoluchowski (HS) relation between the local electrostatic potential and lateral solvent velocity in a continuum fluid at a planar charged surface under the action of a tangential electric field is exact for smooth surfaces, even in the presence of ion correlations. At rough surfaces, the interplay of hydrodynamics and surface friction due to electrostatic and excluded-volume interactions between surface groups and counterions gives rise to pronounced deviations from HS-theory. This is demonstrated by hydrodynamic simulations of ions at charged corrugated surfaces. Derived effective electrokinetic surface charges are highly reduced, in agreement with the experimental trend.
PACS: 82.45.-h – Electrochemistry and electrophoresis / 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc / 47.15.Gf – Low-Reynolds-number (creeping) flows
© EDP Sciences, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.