Non-linear streaming conductance in a single nanopore by addition of surfactants

Abstract

Electrokinetic phenomena in nanofluidic system result in many unique properties and applications due to overlap of electrical double layers. As well known, the streaming current is linear proportional to the pressure gradient of a channel. However, in this Letter, we report a non-linear streaming conductance phenomenon in a single nanopore by addition of ionic surfactants in KCl aqueous solution. The streaming conductance decreases at about 0.8 bar applied pressure in high concentrated surfactant solution that was attributed to the slip of surfactant layer, and the slip length was theoretically estimated.