On the validity of continuous modelling of ion transport through nanochannelsA. Fulinski1, I. D. Kosinska1 and Z. Siwy2, 3
1 M. Smoluchowski Institute of Physics, Jagellonian University Reymonta 4, PL-30-059 Kraków, Poland
2 Gesellschaft für Schwerionenforschung (GSI) - Planckstr. 1 D-64291 Darmstadt, Germany
3 Silesian University of Technology - Strzody 9, 44-100 Gliwice, Poland
(Received 12 November 2003; accepted in final form 4 June 2004)
Ion transport through nanopores is modelled by the Smoluchowski equation. The model, based on properties of a bulk electrolyte solution and containing no adjustable parameters, is compared with ion current data recorded for single cylindrical nanopores in polymeric films. It predicts qualitatively a possibility of constructing an ion current rectifier based on the symmetric nanopore with asymmetric charge distribution. Our experimental data, however, indicate that the bulk-type diffusion approach does not describe the surface current, which gives a significant contribution to the total ion current through nanopores.
87.16.Uv - Active transport processes; ion channels.
81.07.De - Nanotubes.
81.16.-c - Methods of nanofabrication and processing.
© EDP Sciences 2004