Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 14, Issue 46, Pages 12129-12145Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/14/46/317
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Ion transport between two baths of fixed ionic concentrations and applied electrostatic (ES) potential is analysed, using at one-dimensional drift-diffusion (Poisson-Nernst-Planck, PNP) transport system designed to model biological ion channels. The ions are described as charged, hard spheres with excess chemical potentials computed from equilibrium density functional. theory (DFT). The method of Rosenfeld, (Rosenfeld Y 1993 J. Chem. Phys. 98 8126) is generalized to calculate the ES excess chemical potential in channels. A numerical algorithm for solving the set of integral-differential PNP/DFT equations is described and used-to calculate-flux,through a calcium-selective ion channel.
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