Electrophoretic Behavior of a Soft Particle Normal to a Plane
Date Issued
2006
Date
2006
Author(s)
Cheng, Wen-Li
DOI
zh-TW
Abstract
The electrophoretic behavior of a soft particle normal to a plane is investigated in this study using pseudo-spectral method. Due to its unique physical structure, soft particle system can be used to model some bio-particles or artificial particles appropriately. We treat the problem by separating the physical region into two domains useing spherical coordinates and bispherical coordinates respectively. The coupled hydrodynamic, electrical potential and ion conservation equations or the so-called electrokinetic equations are then linearized assuming the applied electric field is weak. The resulted problem is solved numerically using Newton-Raphson iteration scheme.
We find that as the friction coefficient of the soft particle increases, the drag force increases as a result, thus the electrophoretic motion becomes slow. If the friction coefficient is very small, the result will be very similar to the typical colloid particle. When we introduce the fix charge density, the equilibrium state is affected greatly and generate extra electric force which enhance the electrophoretic motion. Moreover, we find that the boundary effect is more significant when the thickness of electric double layer is large or the soft particle is closer to the plane.
Subjects
電泳現象
軟球
雙球座標
電雙層
邊界效應
electrophoretic behavior
soft particle
bispherical coordinates
electric double layer
boundary effect
Type
thesis
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