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Numerical Modeling of the Bistability of Electrolyte Transport in Conical Nanopores
Published in 2013
A characteristic feature of nanochannels is that surface properties (e.g., electrical charge) play a more significant role in the transport of fluid and electrolyte. Two oppositely directed flows (electroosmotic flow and pressure-driven flow) determine the flow profile at the nanopore orifice as well as electrolyte distribution. Once there are two electrolyte solutions with different concentrations inside and outside, a conductivity bistability, a sudden transition between two states with different conductivities, is observed. A simulation in COMSOL Multiphysics® semi-quantitatively captures the experimental observations and provides important information about the mechanism of the bistability.
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