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We unveil the role of substrate wettability on the reversal in the sign ofthe interfacial charge distribution in a nanochannel in presence of multivalentions. In sharp contrast to the prevailing notion that hydrophobic interactionsmay trivially augment the effective surface charge, we demonstrate that theinterplay between surface hydrophobicity and interfacial electrostatics mayresult in a decrease in the effective interfacial potential, and a consequentcharge inversion over regimes of low surface charges. We also show that thisphenomenon, in tandem with the interfacial hydrodynamics may non-trivially leadto either augmentation or attenuation or even reversal of the net streamingcurrent, depending on the relevant physical scales involved. These results,supported by Molecular Dynamics simulations and experimental data, may bear farranging consequences in understanding complex biophysical processes anddesigning nanofluidic devices and systems involving multivalent counterions.

Wettability Modulated Charge Inversion and Ionic Transport in Nanofuidic Channels