No abstract

The track‐etch technique is used to prepare mica membranes with known pore structure. The electrochemical properties of the pore wall in contact with aqueous KCl solutions are studied by measuring the electrical conductivity of the pore fluid. The experimental results are discussed in terms of the model of the membrane with narrow pores. The experiments indicate that the charge of the pore wall is a net charge formed by positive and negative charges. The negative charges are present in small surplus (about 10%). The total charge density corresponds to 1 elementary charge per 104 A2 of pore wall.