Dynamic Electrophoretic Behavior of a Liquid Drop in a Spherical Cavity
Date Issued
2005
Date
2005
Author(s)
Min, Wei-Lun
DOI
zh-TW
Abstract
In this study, we investigate the dynamic electrophoretic mobility of a spherical liquid drop in a spherical cavity. The cavity model suggested by Zydney in 1995 is adopted to describe our system, and what we built is a set of electro-acoustic equations composed of the coupled electric field, the flow field, and the ion concentration field. With appropriate assumptions and simplifications, we are able to solve this set of electro-acoustic equations by the pseudo-spectral method. Given that the ion-cloud distortion can not be neglected, the effect of ion polarization disposes the dynamic mobility to a local maximum and a phase lead. When the surface potential is high or the thickness of the double layer is thin, the extent of the ion-cloud distortion will be more prominent. It is suggested that the lower the viscosity of a non-conducting liquid drop, the greater its dynamic mobility. As the volume fraction of the liquid drop is so large that the cavity compresses it, the dynamic mobility of the liquid drop will substantially decrease.
Subjects
液滴
孔洞
振盪電泳速度
電雙層
liquid drop
cavity
dynamic mobility
double layer
high surface potential
Type
thesis
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