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Colloid science / Low-frequency dispersion / Dielectric relaxation of non-conducting colloidal particles in

Dielectric relaxation of non-conducting colloidal particles in non-binary solutions: mutual enhancement of adsorption oscillations

I.A. Razilov, N.J. Zharkikh, F. Gonzalez-Caballero,
A.V. Delgado, S.S. Dukhin

This paper deals with the low-frequency dielectric dispersion (LFDD) of colloidal suspensions with non-binary electrolyte solutions as dispersion media. Starting from the theory of double-layer concentration polarization in AC fields, it is demonstrated that countenons can undergo significant adsorption oscillations which can increase to a large extent the dielectric increment of the suspensions. It is also shown that such oscillations can also affect the characteristic relaxation frequency of the dielectric spectrum. This quantity can be either larger or smaller than it would be in a purely binary electrolyte, in which adsorption oscillations do not occur. The predictions of the theory are compared to experimental LFDD data reported in the literature.


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Dumanski Institute of Colloid and Water Chemistry, Ukrainian National Academy of Sciences, Kyiv, Ukraine

Received 13 Jun 1996

Published : Colloids and Surfaces A: Physicochemical and Engineering Aspects 121 (1997) 173-187.

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