ELECTROPHORETIC MOBILITY OF A PARTICLE COATED WITH A CHARGED MEMBRANE- EFFECTS OF FIXED CHARGE AND DIELECTRIC-CONSTANT DISTRIBUTIONS

The electrophoretic mobility of a particle coated with an ion-penetrab le charged membrane in a uniform electric field is investigated. In pa rticular, the effects of the distribution of fixed charges and that of the dielectric constant in the membrane phase on the electrophoretic mobility are investigated. The results of numerical simulation reveal that these effects can be significant. In particular, for a constant t otal amount of fixed charges, assuming a homogeneous fixed charge dist ribution may lead to an appreciable deviation. (C) 1995 Academic Press , Inc.