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Updated: Jul 16, 2026

Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization
Published on: December 25, 2017
Optimization of zeta potential profile for low-dispersion flows in microchannel turns
1Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, South Korea. hmpark@sogang.ac.kr <hmpark@sogang.ac.kr>
Abstract:
A method is developed to determine the optimal profile of zeta potential around U turns such that the turn-induced spreading of a solute band is minimized. After proposing a velocity profile that eliminates the racetrack effect, a conjugate gradient method is adopted to find the zeta potential profile to induce the required velocity. The optimal profiles of zeta potential seem to be insensitive to the relevant parameters of electroosmotic flows. It is shown that a reduction of variance two orders of magnitude below that of a comparable turn with uniform zeta potential is easily attained by adopting the optimal profile of zeta potential, which can be realized using a UV excimer laser or external voltage control.
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