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Electrophoresis of soft particles: Analytic approximations
Author(s) -
Ohshima Hiroyuki
Publication year - 2006
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/elps.200500636
Subject(s) - polyelectrolyte , electrophoresis , particle (ecology) , radius , charged particle , debye length , core (optical fiber) , debye , colloid , materials science , physics , polymer , chemistry , chemical physics , optics , chromatography , condensed matter physics , ion , composite material , quantum mechanics , computer science , oceanography , computer security , geology
An approximate analytic expression is derived for the electrophoretic mobility of a weakly charged spherical soft particle ( i.e. , a hard particle covered with a weakly charged polyelectrolyte layer) on the basis of the general mobility expression for soft particles (Ohshima, H., J. Colloid Interface Sci. 2000, 228 , 190–193). The obtained mobility expression, which reproduces various approximate results so far derived and gives some new mobility formulas, covers all types of weakly charged soft particles with arbitrary values of the thickness of polymer layer, the radius of the particle core, the electrophoretic softness, and the Debye length, including spherical polyelectrolytes with no particle core as well as spherical hard particles with no polyelectrolyte layer.