(333m) Role Of Electro-Osmosis Based Flows On The Effective Transport In A Rectangular Geometrical Electrophoretic Cell

Separation of biomacromolecules embraces a significant number of applications related to, for example, electro-assisted drug delivery, micro-electrophoretic separations, soil remediation processes, and material processing, just to name a few. Although, the influence on the flow regimes on effective transport has been identified in the literature, the specific role of electrosmotic type forces has not been reported. This contribution focuses on the understanding of the role of electro-advective, i.e. electro-osmosis driven flows on dispersion of solutes. Furthermore, this contribution builds the baseline for comparison with different capillary geometries and how separation or mixing may be controlled. Using the spatial averaging method in combination with the solute species continuity equation, the authors have derived analytical expressions for effective parameters, i.e., effective dispersion coefficient and effective convective velocity. Illustrations are presented to demonstrate the effect of different parameters in a capillary channel of rectangular geometry. The influence of applied electric field, surface potential and Debye length on the velocity profiles are examined.