期刊
EUROPHYSICS LETTERS
卷 63, 期 4, 页码 616-622出版社
E D P SCIENCES
DOI: 10.1209/epl/i2003-00557-x
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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.
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