Ion transport in nanofluidic channels

Theoretical modeling of ionic distribution and transport in silica nanotubes, 30 nm in diameter and 5 mum long, suggest that when the diameter is smaller than the Debye length, a unipolar solution of counterions is created within the nanotube and the coions are electrostatically repelled. By locally modifying the surface charge density through a gate electrode, the ion concentration can be depleted under the gate and the ionic current can be significantly suppressed. It is proposed that this could form the basis of a unipolar ionic field-effect transistor.