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Electrophoresis of randomly charged particles
Author(s) -
Velegol Darrell
Publication year - 2002
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(200207)23:13<2023::aid-elps2023>3.0.co;2-q
Subject(s) - electrokinetic phenomena , electrophoresis , zeta potential , charge (physics) , brownian motion , analytical chemistry (journal) , particle (ecology) , chemistry , chemical physics , nanotechnology , physics , chromatography , materials science , nanoparticle , quantum mechanics , oceanography , geology
The technique of “rotational electrophoresis” has been developed recently to measure the charge nonuniformity on Brownian particles in a suspension. Measurements of the angular velocity in electrophoresis are interpreted with electrokinetic theory to give a standard deviation of zeta potential among N regions on a particle. A key question is how various molecular mechanisms of charging could lead to charge nonuniformity on a length scale of O (100 nm). Simple statistical physics is used to show that although Poisson charging with univalent charges cannot explain recent measurements showing significant charge nonuniformity, random charging with multivalent charges can better explain the data. In addition, the result shows that a small number of charged “visualization” molecules can be adsorbed to a particle without impacting the experimental technique of rotational electrophoresis.