Ionic transport and membrane potential in porous media with interfacial charges

Pabitra N. Sen

Physica A: Statistical Mechanics and its Applications, 1989, vol. 157, issue 1, 446-453

Abstract: Electrical conductivity σ of a porous medium, in which the pore-walls carry an electric double layer, is shown to be a nonlinear function of the electrolyte conductivity σw, which fills the pores. As σw increases, dominant current paths shift from surface to pore and therefore are subjected to different tortuosities. σ is shown to be a superposition of cation and anion conductivities σ = σcation + σanion, and membrane potential is proportional to σcation/(σcation + σanion). The macroscopic conductivities σcation and σanion depend on microgeometry of the pore and surface as well as the surface charges. Thus, geometrical effects are similar for membrane potential and conductivity.

Date: 1989
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:157:y:1989:i:1:p:446-453

DOI: 10.1016/0378-4371(89)90342-7

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