Gao Yandong, Li Dongqing
Department of Mechanical Engineering, Vanderbilt University, VU Station B 351592, 2301 Vanderbilt Place, Nashville, TN 37235, USA.
J Colloid Interface Sci. 2008 Mar 1;319(1):344-52. doi: 10.1016/j.jcis.2007.11.052. Epub 2007 Dec 7.
The translational electrophoretic motion of a colloidal spherical particle parallel to a planar liquid-fluid interface is analyzed by using the reciprocal theorem developed by Yariv and Brenner [E. Yariv, H. Brenner, J. Fluid Mech. 484 (2003) 85]. Based on the thin electric double layers assumption, analytical solutions of the forces acting on the particle are obtained, and the influence of the liquid-fluid interface on the electrophoretic velocity of the particle is studied. It is found that the speed of the particle's electrokinetic motion will increase as the separation distance between the particle and the interface decreases. This enhancement of electrophoretic mobility becomes more significant when the viscosity of the fluid phase becomes larger.
利用亚里夫和布伦纳[E. 亚里夫，H. 布伦纳，《流体力学杂志》484 (2003) 85]提出的互易定理，分析了胶体球形颗粒平行于平面液 - 液界面的平移电泳运动。基于薄电双层假设，得到了作用在颗粒上的力的解析解，并研究了液 - 液界面对颗粒电泳速度的影响。研究发现，随着颗粒与界面之间的分离距离减小，颗粒的电动运动速度会增加。当流体相的粘度变大时，这种电泳迁移率的增强变得更加显著。
