Electroosmosis at inhomogeneous charged surfaces

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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.
Publisher
EDP SCIENCES S A
Issue Date
2005-12
Language
English
Article Type
Article
Keywords

POLYELECTROLYTES; ELECTROPHORESIS; ELECTROKINETICS; ELCTROOSMOSIS; CONDUCTION; SYSTEM

Citation

EUROPHYSICS LETTERS, v.72, no.5, pp.837 - 843

ISSN
0295-5075
DOI
10.1209/epl/i2005-10301-2
URI
http://hdl.handle.net/10203/90785
Appears in Collection
NT-Journal Papers(저널논문)
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