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- W1617574517 abstract "(Dated: February 2, 2008)The current theory of alternating-current electro-osmosis (ACEO) is unable to explain the experi-mentally observed flow reversal of planar ACEO pumps at high frequency (above the peak, typically10−100 kHz), low salt concentration (1−1000 µM), and moderate voltage (2−6 V), even if takinginto account Faradaic surface reactions, nonlinear double-layer capacitance and bulk electrothermalflows. We attribute this failure to the breakdown of the classical Poisson-Boltzmann model of thediffuse double layer, which assumes a dilute solution of point-like ions. In spite of low bulk saltconcentration, the large voltage induced across the double layer leads to crowding of the ions anda related decrease in surface capacitance. Using several mean-field models for finite-sized ions, weshow that steric effects generally lead to high frequency flow reversal of ACEO pumps, similar toexperiments. For quantitative agreement, however, an unrealistically large effective ion size (severalnm) must be used, which we attribute to neglected correlation effects.I. INTRODUCTION" @default.
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- W1617574517 date "2007-11-29" @default.
- W1617574517 modified "2023-09-27" @default.
- W1617574517 title "High-frequency flow reversal of AC electro-osmosis due to steric effects" @default.
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