Ionic current through highly confined nanochannels receives significant attention over the past decade because of the novel phenomena from the overlapped electric double layers. In addition, nanoscale Coulter-type single molecule sensors detect the modulation of ionic current through individual nanopores to sense the translocation of single molecules or nanoparticles. The baseline ionic current and its noise determine the sensitivity of the Coulter-type single molecule sensors. All published research on ionic current through nanochannels focuses on the effects of overlapped electric double layers without paying much attention to the ionic transport through nanopores for high concentration electrolytes with non-overlapped double layer. Therefore, the ionic current data for high concentration electrolytes through nanochannels are limited and not systematic.

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