Evaluation of Relative Permittivity and Electrical Conductivity of Ion-Exchange Beads by Analysis of High-Frequency Dielectric Relaxations

Abstract

Dielectric measurements on suspensions of an ion-exchange resin, Sephadex G-25, in water, were carried out over the frequency range 30 Hz to 1.7 MHz. The marked dielectric relaxations observed were assigned to interfacial polarization. To evaluate the relative permittivity and electrical conductivity of the dispersed resin beads from the dielectric relaxation data, the observed data were analysed on the basis of two theoretical equations: one proposed by Wagner for dilute disperse systems, and the other derived by Hanai for concentrated disperse systems. The results of this data analysis showed that more suitable values for the relative permittivity and electrical conductivity of the beads in suspension were obtained from Hanai's equations.