Coupled concentration polarization and electroosmotic circulation near micro/nanointerfaces: Taylor-Aris model of hydrodynamic dispersion and limits of its applicability.
作者： Andriy Yaroshchuk , Emiliy Zholkovskiy , Sergey Pogodin , Vladimir Baulin
DOI: 10.1021/LA201354S
关键词: Concentration polarization 、 Flow (psychology) 、 Limiting current 、 Analytical chemistry 、 Mechanics 、 Electrokinetic phenomena 、 Dispersion (optics) 、 Boundary layer 、 Microchannel 、 Chemistry 、 Current (fluid)
摘要: Mismatches in electrokinetic properties between micro- and nanochannels give rise to superposition of electroosmotic pressure-driven flows the microchannels. Parabolic or similar flow profiles are known cause so-called hydrodynamic dispersion, which under certain conditions can be formally assimilated an increase solute diffusivity (Taylor–Aris model). It is demonstrated theoretically that taking into account these phenomena modifies considerably pattern current-induced concentration polarization micro/nanointerfaces as compared classical model unstirred boundary layer. In particular, dispersion leads disappearance limiting current. At essentially “over-limiting” current densities, time-dependent salt microchannels behave like sharp “fronts” moving away from interface until they reach reservoir end microchannel. Under galvanostatic postulated this study, “fro...
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