Volume 63, Number 4, August 2003
|Page(s)||616 - 622|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 November 2003|
Conduction and diffusion in two-dimensional electrolytes
Sektion Physik, LMU - Theresienstr. 37, 80333 München, Germany
Accepted: 12 June 2003
Using Brownian-Dynamics simulations, a two-dimensional mixture of charged soft spheres is considered as a model system for cat-anionic lipid layers in tangential electric fields. Electrophoretic mobilities and diffusion constants are determined for a wide range of densities, electric field and Coulomb coupling strengths; the experimentally discovered violation of the Nernst-Einstein relation is reproduced for elevated densities. At large driving fields, a non-equilibrium transition into a charge-modulated structure (at finite Coulomb interaction between particles) or a macroscopic phase separation (at vanishing Coulomb coupling) is found, which might be experimentally reached with mixtures of rather incompatible cationic and anionic lipids.
PACS: 82.70.-y – Disperse systems; complex fluids / 87.15.-v – Biomolecules: structure and physical properties / 82.45.-h – Electrochemistry and electrophoresis
© EDP Sciences, 2003
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