Volume 67, Number 4, August 2004
|Page(s)||683 - 690|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 August 2004|
On the validity of continuous modelling of ion transport through nanochannels
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
Accepted: 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.
PACS: 87.16.Uv – Active transport processes; ion channels / 81.07.De – Nanotubes / 81.16.-c – Methods of nanofabrication and processing
© EDP Sciences, 2004
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