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Journal Article

Extended Nernst-Planck equation incorporating partial dehydration effect

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Wang, Zhong
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Citation

Wang, Z., Yuan, Z., & Liu, F. (2020). Extended Nernst-Planck equation incorporating partial dehydration effect. Chinese physics letters, 37(9): 094701. doi:10.1088/0256-307X/37/9/094701.

Abstract

Novel ionic transporting phenomena emerge as nanostructures approach the molecular scale. At the sub-2nm scale, widely used continuum equations, such as the Nernst–Planck equation, break down. Here, we extend the Nernst–Planck equation by adding a partial dehydration effect. Our model agrees with the reported ion fluxes through graphene oxide laminates with sub-2nm interlayer spacing, outperforming previous models. We also predict that the selectivity sequences of alkali metal ions depend on the geometries of the nanostructures. Our model opens a new avenue for the investigation of the underlying mechanisms in nanofluidics at the sub-2nm scale.