Figure 14.

Distribution of K⁺ and Cl⁻ currents in a phantom pore. The density of the current in an annular regions centered on the pore axis is plotted against the mean distance from the pore axis to the annulus for bulk KCl concentrations of (A) 0.1 M, (B) 1.3 M, and 1.7 M (C). Note that the current maximum near a radial coordinate of 0.75 nm coincides with the maximum of the ion concentration (see Figure 9), which is due to the −2k_BT attractive potential energy at the pore wall.