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Electrophoretic Mobility of a Spherical Colloidal Particle in a Salt-Free Medium

✍ Scribed by Hiroyuki Ohshima

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 101 KB
Volume: 248
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.2002.8232

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✦ Synopsis

A general expression as well as approximate expressions are derived for the electrophoretic mobility of dilute spherical colloidal particles in a salt-free medium containing only counter ions. It is shown that there is a certain critical value of the particle surface charge. When the particle surface charge is lower than the critical value, the electrophoretic mobility is proportional to the particle surface charge or the particle zeta potential, following Hückel's formula. When the particle surface charge is higher than the critical value, the electrophoretic mobility becomes independent of the particle surface charge. This is due to the effect of counter ion condensation in the vicinity of the particle surface.

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