膠體粒子對平面之電泳運動(3/3)
Date Issued
2005-10-21
Date
2005-10-21
Author(s)
DOI
932214E002003
Abstract
The electrophoretic behavior of the spherical, non-conducting particle normal to
a plane is investigated in this study. We separate this system into three topics. In
the first year, we consider the electrophoresis of a long cylindrical particle with an
arbitrary zeta potential normal to the plane. Moreover, we find the electrophoretic
behavior under the arbitrary applied field in the second year. Finally, with the aid of
orthogonal collocation method and bipolar coordinates, we extend previous analyses
in that the flow field inside the spherical particle can not be neglected, and the electric
double layer thickness for the particle is arbitrary.
We find that the electrophoretic mobility of the particle is affected by some
factors: double layer thickness, zeta potential, the strength of applied field, the
viscosity ratio between the fluid inside and outside the liquid drop, and the distance to
the solid plane. We find that the magnitude of the scaled electrophoretic mobility
increases with the decrease of double layer thickness. However, the polarization
effect must be considered when the magnitude of zeta potential is large. Besides, the
mobility will increase with the decrease of viscosity ratio. This is because the flow
inside the drop enhances the hydrodynamic drag on the liquid drop. In addition, we
find that the closer the particle to the plane, the more significant the distortion of
electric double layer. The electrophoretic mobility becomes slower.
Subjects
electrophoresis
normal to a plane
boundary effect
numerical method
Publisher
臺北市：國立臺灣大學化學工程學系暨研究所
Type
report
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