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Updated: Jun 1, 2026

Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
Published on: September 7, 2018
Effect of electrical double-layer overlap on the electroosmotic flow in packed-capillary columns
1Laboratory for Analytical Chemistry, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands.
Abstract:
A plug electroosmotic velocity profile is generally assumed to be characteristic of capillary electrochromatography. However, this ideal plug flow may be illusive in some experiments with packed-capillary columns due to overlap of electrical double layers in flow channels. We report here a theoretical analysis of the double-layer overlap effects in packed-capillary columns, which is based on Rice and Whitehead's theory of electroosmotic flow combined with a capillary tube model for porous packing. The results show that the electroosmotic velocity under the influence of double-layer overlap depends strongly on the operating parameters, which increases with the column porosity, the particle diameter, and the electrolyte concentration.
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