Electrophoresis of a charge-regulated spheroid along the axis of an uncharged cylindrical pore
Resource
Journal of Colloid & Interface Science 264(2003), 121–127
Journal
Journal of Colloid & Interface Science
Pages
-
Date Issued
2003
Date
2003
Author(s)
Hung, Shih-Hsing
DOI
246246/2006111501275355
Abstract
Boundary effects can have a profound influence on the electrophoretic behavior of a charged entity, in particular, when the entity is
nonspherical and its surface conditions are dependent upon the nearby environment. In this study, the electrophoresis of a spheroid along the
axis of an uncharged cylindrical pore is analyzed for the case where the electrical potential is low and the applied electric field is weak. We
consider the case where the surface of a particle contains dissociable acidic and basic functional groups, which simulate biological colloids
and entities covered by an artificial membrane. This leads to a mixed-type boundary value problem, which extends the conventional constantsurface-
potential and constant-surface-charge-density models to a more general case. The effects of the particle aspect ratio, the relative
magnitudes of particle and pore, the thickness of the double layer surrounding a particle, and the pH of the liquid phase on the electrophoretic
mobility of a particle are investigated. Several interesting results are observed; for example, if the volume of a particle is fixed, its mobility
may have a local maximum as the relative magnitudes of its two axes vary.
Subjects
Electrophoresis
Boundary effect
Spheroid in cylinder
Charge-regulation model
SDGs
Publisher
Taipei:National Taiwan University Dept Chem Engn
Type
journal article
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