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Electrophoretic mobility of a particle covered with an ion‐penetrable membrane
Author(s) -
Huang ShiWei,
Hsu JyhPing,
Tseng Shiojenn
Publication year - 2001
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/1522-2683(200106)22:10<1881::aid-elps1881>3.0.co;2-p
Subject(s) - counterion , electrophoresis , ion , membrane , chemical physics , charge (physics) , particle (ecology) , valence (chemistry) , chemistry , fixed charge , materials science , analytical chemistry (journal) , molecular physics , chromatography , physics , biochemistry , oceanography , organic chemistry , quantum mechanics , geology
The electrophoretic behavior of a planar particle covered by an ion‐penetrable membrane, which simulates a biological entity, is investigated. We show that, in general, a point charge model will overestimate the electrophoretic mobility of a particle and the deviation increases with the increase in the concentration of fixed charge and with the decrease in the thickness of membrane layer. As in the case of a point charge model, the present model also predicts a local maximum in the absolute mobility as the thickness of membrane layer varies. If the sizes of counterions of various valences are the same, then the lower the valence of counterions, the larger the mobility, and the larger the counterions, the greater the mobility. The latter is consistent with the experimental observations in the literature. For the level of the concentration of fixed charge examined, the effect of coions on the mobility is negligible.