Electrophoresis of a Sphere Normal to a Plane at Arbitrary Electrical Potential and Double Layer Thickness

The electrophoretic movement of a sphere normal to an uncharged, planar surface is analyzed theoretically, taking the effect of double layer polarization into account. Here, both the surface potential of the particle and the thickness of the double layer surrounding it can be arbitrary. We show that...

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Bibliographic Details
Published in:Journal of colloid and interface science 2002-04, Vol.248 (2), p.383-388
Main Authors: Chih, Ming-Hui, Lee, Eric, Hsu, Jyh-Ping
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Electrochemistry
Exact sciences and technology
General and physical chemistry
Miscellaneous (electroosmosis, electrophoresis, electrochromism, electrocrystallization, ...)
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:The electrophoretic movement of a sphere normal to an uncharged, planar surface is analyzed theoretically, taking the effect of double layer polarization into account. Here, both the surface potential of the particle and the thickness of the double layer surrounding it can be arbitrary. We show that if double layer polarization is neglected, the effect of the surface potential of a particle on its electrophoretic velocity is inappreciable. On the contrary, it becomes significant if double layer polarization is present. However, if the distance between the particle and the surface is sufficiently close, since the hydrodynamic effect dominates, the influence of the surface potential and double layer polarization becomes insignificant.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.2002.8245