Radius of pores, which determine charge selectivity, as a function of C
(calculations according to formula ( 7)). Extrapolation of curves to the ordinate axis gives true value of the radius. Inset: transport number of counter ions as a function of average concentration of the solutions. Extrapolation of the curves to tm = 1 gives the concentration at which the diffusion parts of intraporous double electric layers are overlapped. Membranes: TiO2-HZD-2 (1) and TiO2-HZD-7 (2).