Electrophoretic mobility of concentrated spheres with a charge-regulated surface
Journal
Electrophoresis
Journal Volume
21
Journal Issue
3
Pages
475-480
Date Issued
2000
Author(s)
Abstract
The electrophoretic behavior of a concentrated spherical colloidal particle is modeled theoretically under the Debye-Huckel condition. The surface of a particle contains dissociable functional groups, the dissociation of which yields negative fixed charges. The model derived is applicable to an arbitrarily thick double layer. We show that the absolute surface potential decreases with the increase in £ea; £e and a are the reciprocal Debye length and the radius of a particle, respectively. Moreover, the variation of the absolute electrophoretic mobility as a function of £ea has a maximum.
Subjects
Charge-regulated surface
Concentrated dispersion
Electrophoresis
Unit cell model
Type
journal article