QUASI-EQUILIBRIUM POLARIZATION OF THE STERN LAYER AND LOW-FREQUENCY DIELECTRIC-DISPERSION

Citation
Ia. Razilov et al., QUASI-EQUILIBRIUM POLARIZATION OF THE STERN LAYER AND LOW-FREQUENCY DIELECTRIC-DISPERSION, Colloid journal of the Russian Academy of Sciences, 56(5), 1994, pp. 612-620
Citations number
30
Categorie Soggetti
Chemistry Physical
ISSN journal
1061933X
Volume
56
Issue
5
Year of publication
1994
Pages
612 - 620
Database
ISI
SICI code
1061-933X(1994)56:5<612:QPOTSL>2.0.ZU;2-1
Abstract
The formulas of the theory of concentration polarization in a double l ayer and low-frequency dielectric dispersion (LFDD) were generalized b y considering the concentration polarization in the dense part of the double layer (the Stern layer), under the condition of free ion exchan ge between the diffuse layer and the Stern layer. This mechanism of do uble layer polarization is distinguished by the dependence of the LFDD characteristic frequency on the particle size and on the effective di ffusion coefficient of the electrolyte and by a rather weak dependence on all other parameters of the system (for example, on the electrolyt e concentration). In contrast to similar studies by Lyklema and cowork ers, this generalization was obtained for an arbitrary ratio between t he Stern and the electrokinetic potentials, and considers the differen ce between the diffusion coefficients of the cations and anions. Becau se of the more general nature of the resulting formulas, they signific antly extend the possibility of interpreting the results of complex in vestigations, including LFDD and electrophoretic measurements.