Electrophoretic Behavior of Soft Particles in Eccentric System
Date Issued
2007
Date
2007
Author(s)
Chiang, Jen-Hau
DOI
zh-TW
Abstract
The electrophoretic behavior of a soft ball particle in the eccentric system is investigated in this study using pseudo-spectral method. We used eccentric ratio represent position of the particle in the cavity. Due to this system is a more complicated system, It is only the axial symmetry in the level rotation direction, that is to say this is a two-dimensional system. We treat the problem by separating the physical region into two domains using spherical coordinates and bispherical coordinates respectively. Assumption the applied electric filed is weak and arbitrary double layer thickness and particle surface potential, we used orthogonal collocation method and Newton-Raphson iteration method to solve the eletrokinetic equations.
The result of study is found, when the soft ball particle partial toward boundary of cavity, the electrophoretic mobility will be decline, this Phenomenon is affect by boundary effect of cavity, and the effect is also affect the polarization. When we introduce the fixed charge density, the soft ball particle will get extra electric force which enhances the electrophoretic mobility, but if the friction coefficients of the soft particle increases, the drag force increases as a result, thus the electrophoretic mobility becomes slow.
Subjects
偏心率
軟球粒子
邊界效應
雙球座標
電雙層
eccentric ratio
soft ball particle
boundary effect
bispercial coordinate
electric double layer
Type
thesis