Ion mobility and ionic conductance in nanodevices are known to deviate from bulk behavior, a phenomenon often attributed to surface effects. We demonstrate that dielectric mismatch between the electrolyte and the surface can qualitatively alter ionic transport in a counterintuitive manner. Instead of following the polarization-induced modulation of the concentration profile, mobility is enhanced or reduced by changes in the ionic atmosphere near the interface and affected by a polarization force parallel to the surface. In addition to revealing this mechanism, we explore the effect of salt concentration and electrostatic coupling.
@article{arxiv.1809.05213,
title = {Dielectric modulation of ion transport near interfaces},
author = {Hanne S. Antila and Erik Luijten},
journal= {arXiv preprint arXiv:1809.05213},
year = {2018}
}