Study of Electrolyte Conductivity in Charged Microcapillary Porous Membranes

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Abstract
The electrolyte conductivities of several microporous membranes, when bathed by an electrolyte solution, have been measured by the dc method. With membranes of the polycarbonate track-etched thin film type (Nuclepore), the mean pore diameter ranged from 0.015 to 0.100 μm. Concentrations of the studied electrolyte (LiCl, NaCl, and MgCl2) range from 5 × 10−4 to 2 × 10−2 mol/L. The results obtained have been compared to those deduced from a space-charge model for the electrolyte transport in charged capillary pores. This allows an estimate of the charge density on the pore walls which agrees with those obtained earlier for these types of membranes and solutes from a study of other electro-kinetic phenomena.