Hydrodynamics within the Electric Double Layer on slipping surfaces

Details Hydrodynamics within the Electric Double Layer on slipping surfaces Hydrodynamics within the Electric Double Layer on slipping surfaces

2004-11-10

arxiv.org/abs/cond-mat/0411257v1

Phys. Rev. Lett. 93, 257805 (2004)

Physics

Condensed Matter

Soft Condensed Matter

accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.93.257805

We show, using extensive Molecular Dynamics simulations, that the dynamics of the electric double layer (EDL) is very much dependent on the wettability of the charged surface on which the EDL develops. For a wetting surface, the dynamics, characterized by the so-called Zeta potential, is mainly controlled by the electric properties of the surface, and our work provides a clear interpretation for the traditionally introduced immobile Stern layer. In contrast, the immobile layer disappears for non-wetting surfaces and the Zeta potential deduced from electrokinetic effects is considerably amplified by the existence of a slippage at the solid substrate.

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