Dynamic electrophoresis of a spherical dispersion of soft particles subject to a stress-jump condition
Journal
Journal of Colloid and Interface Science
Journal Volume
299
Journal Issue
1
Pages
464-471
Date Issued
2006
Abstract
The dynamic mobility of a spherical dispersion of soft particles, where a particle comprises a rigid core and a membrane layer, is evaluated for the case when the shear stress across the membrane layer-liquid interface is discontinuous, the so-called stress-jump condition. We show that, due to the effect of double-layer deformation, the magnitude of the dynamic mobility of a particle has a local maximum and the corresponding phase angle has a negative (phase lead) local minimum at a low to medium level of the frequency of the applied electric field. This effect becomes insignificant if the frequency of the applied electric field is sufficiently high. The stress-jump condition may lead to a significant influence on the drag, and consequently the mobility of a particle. The degree of influence depends upon the sign of the stress-jump coefficient and the charged conditions of the membrane layer of the particle. ? 2006 Elsevier Inc. All rights reserved.
Subjects
Dynamic electrophoresis
Soft particles
Spherical dispersion
Stress-jump condition
Type
journal article