Ionic conductivity on a wetting surface

Details Ionic conductivity on a wetting surface Ionic conductivity on a wetting surface

2009-07-17

arxiv.org/abs/0907.3124v4

Phys. Rev. E 80, 041925 (2009)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 3 figures; one section and two illustrations added; figures updated and discussion added; typo fixed

Scientific paper

10.1103/PhysRevE.80.041925

Recent experiments measuring the electrical conductivity of DNA molecules highlight the need for a theoretical model of ion transport along a charged surface. Here we present a simple theory based on the idea of unbinding of ion pairs. The strong humidity dependence of conductivity is explained by the decrease in the electrostatic self-energy of a separated pair when a layer of water (with high dielectric constant) is adsorbed to the surface. We compare our prediction for conductivity to experiment, and discuss the limits of its applicability.

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