Influence of the Porous Layer Structure of a Soft Colloid on its Hydrodynamic and Electrophoretic Behaviors
Date Issued
2012
Date
2012
Author(s)
Chou, Chih-Hao
Abstract
The electrophoretic mobility of soft colloidal particles is investigated in this study for various types of problems by using finite volume method. For the present study, we consider the effect of surface (layer) structure on the electrophoresis behaviors of a soft colloid, and also extend the integrated soft (porous) particle to non-integrated one like the toroid. The analysis include 3D simulations of hydrodynamic drag on a nonhomogeneously structured permeable sphere and advective flow thereof, electrophoresis of an arbitrarily oriented toroid in an unbounded electrolyte solution, importance of the porous structure of a soft particle on its electrophoretic behavior, and electrophoresis of a soft toroid with exponential segment distribution in an unbounded electrolyte solution. Referring to the skill of calculation, the coupled flow field and electric field equations or so-called electrokintic equations can be linearized assuming the applied electric field is weak and the surface potential is low, and therefore, a superposition is used to solve problem.
We found that the particle mobility is affected by several factors, the fixed charge density of the porous layer, the drag (resistance) coefficient of the porous layer, the uniformity of the porous layer, and the thickness of the porous layer. Results reveal that when the fixed charge density is higher, the drag (resistance) coefficient is smaller, the porous layer is more uniform, or the porous layer is thicker, the electrophoresis mobility of a soft colloid will be enlarged. In addition, when the thickness of electric double layer is larger, the effect of surface (layer) structure on the electrophoresis behavior of a soft colloid will be more obvious.
Subjects
Electrophoresis
Surface (layer) structure
Toroid
Soft colloid
Fixed charge density
Uniformity
Type
thesis
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