The electrophoretic mobility of a porous aggregate

This work predicts the dependence of electrophoretic mobility on zeta potential for a porous aggregate. The analysis of the electrophoretic motion of a porous spherical aggregate differs from the classical analysis of a solid dielectric sphere in two important aspects: the sphere can not be assumed...

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Bibliographic Details
Published in:Journal of colloid and interface science 1992-10, Vol.153 (1), p.237-243
Main Authors: Miller, Nils P, Berg, John C, O'Brien, Richard W
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:This work predicts the dependence of electrophoretic mobility on zeta potential for a porous aggregate. The analysis of the electrophoretic motion of a porous spherical aggregate differs from the classical analysis of a solid dielectric sphere in two important aspects: the sphere can not be assumed impermeable if there is electroosmotic flow within the aggregate, and the sphere cannot be considered nonconducting if conducting fluid is entrained in the aggregate's pore spaces. Both of these effects are considered for the low zeta potential case by applying the unit cell model to the aggregate interior. The results show that at high and low electrolyte concentrations the mobility of the aggregate will be significantly higher and lower, respectively, than it would be for a solid dielectric sphere.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(92)90315-D