Abstract
A theory of the low-frequency relaxation of suspensions of ion exchange resin (IER) particles in electrolyte solution is presented. It is a revision of a previous work on this system (Simonov I. N., and Shilov V. N.,Colloids J.39,891, 1977) and uses a model similar to the one originally developed for suspensions of charged insulating particles (Shilov V. N., and Dukhin S. S.,Colloids J.32,293, 1970). The problem is analytically solved for two extreme cases: a perfectly rigid IER and a weakly bound IER which swells depending on the electrolyte concentration. The results obtained in both cases show a low-frequency high-amplitude relaxation analogous to the one observed in suspensions of polystyrene particles. Furthermore, for weakly bound IER suspensions, some calculated spectra show a frequency range in which the permittivity increases with frequency. The origin of this inductive behavior is not due to inertial effects but rather to differences in the diffusion coefficients of the two types of ions in each medium, and between media.
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