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Bulk fluid flow or volume flow in the direction of counterion flow is a probable mechanism for enhanced flux of uncharged species by iontophoresis. Both the electrical volume force effect, resulting from the interaction of the “ion atmosphere” and the electric field, and an induced osmotic pressure effect produce volume flow in the same direction as counterion flow through the membrane. Since each...
Previous studies suggest that bulk fluid flow by electroosmosis is a significant factor in iontophoresis and may provide an explanation for the observed enhanced transport of neutral species. In a charged membrane, the solution carries a net charge and thus experiences a volume force in an electric field, which causes volume flow (Jv in the direction of counterion flow. Jv data were obtained for...
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