Electrophoretic Mobility of Soft Particles

✍ Scribed by Hiroyuki Ohshima

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 358 KB
• Volume: 163
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1994.1126

✦ Synopsis

A general expression is derived for the electrophoretic mobility of a soft particle, i.e., a spherical hard colloidal particle of radius (a) coated with a layer of polyelectrolytes of thickness (d) in an electrolyte solution. In the limit of (d \rightarrow 0), the mobility expression tends to that for a spherical hard particle (Ohshima et al., (J). Chem. Soc. Faraday Trans. 2 79, 1613 (1983)), whereas in the limit of (a \rightarrow \infty), it tends to that for a plate-like soft particle derived previonsly (J. Colloid Interface Sci. 130, 281 (1989)). Also in the limit of (a \rightarrow 0) and low potentials, the obtained mobility expression tends to a mobility formula for a spherical polyelectrolyte (a charged porous sphere with no particle core) derived by Hermans and Fujita (K. Ned. Akad. Wet. Proc. Ser. B 58, 182 (1955)). A simple approximate analytic mobility expression is presented. (1) 1994 Academic Press, Inc.