Issue 12, 2001

Ion size effects on the streaming potential of narrow charged pores

Abstract

The effects of ion size on the streaming potential of fixed charge membranes with narrow pores are studied theoretically as a function of the ratio between the ionic and the pore radii, and the ratio between the external concentration and the membrane fixed charge concentration. To this end, the radial distributions of the ionic concentrations, space charge density, pressure and electric potential are obtained for finite size and point ions using a generalised Poisson–Boltzmann equation. It is found that the streaming potential increases significantly with increasing ion size. The results are presented in terms of experimentally controlled parameters in order to stimulate targeted experimental work with well defined ionic species and membranes.

Article information

Article type
Paper
Submitted
23 Feb 2001
Accepted
20 Apr 2001
First published
21 May 2001

Phys. Chem. Chem. Phys., 2001,3, 2493-2496

Ion size effects on the streaming potential of narrow charged pores

J. Cervera, J. A. Manzanares and S. Mafé, Phys. Chem. Chem. Phys., 2001, 3, 2493 DOI: 10.1039/B101743H

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