Ion Track Technology

PhysicsConsult

Reimar Spohr

PostHeaderIcon Abstract

Electrolyte transport in charged single ion track capillaries. A. Wolf, N. Reber, P. Yu. Apel, B.E. Fischer, R. Spohr. Nuclear Instruments and Methods in Physics Research B 105, pp. 291-293, (1995)

The pH and concentration dependence of the electric current through etched single ion tracks in poly (ethyleneterephthalate) (PET) membranes is investigated using KCl solutions. The pH dependence of the current is attributed to the dissociation of the immobile carboxylic end groups attached to the PET leading to charged pore walls. As consequence a counterion layer near the pore walls is formed with increased conductivity. At low KCl concentrations surface conductivity can be several orders of magnitude above the regular volume conductivity.