Spectral induced polarization of Na-montmorillonite dispersions

Abstract : Montmorillonite (Mt) clays have a high specific surface area and surface charge, which confer them remarkable adsorption properties. Nevertheless, their electrochemical and aggregation behavior are not completely elucidated because of the complexity of their microstructural and interfacial properties. In this work, the conductive and dispersive properties of Na-Mt suspensions of weight fractions 0.5 to 5.2% were investigated for the first time using the spectral induced polarization method. A four-electrode system was used to reduce errors introduced by electrode polarization and contact resistances. Complex conductivity spectra in the low-frequency range of 0.1 Hz to 45 kHz were successfully described using a triple layer model of the basal surface of Mt and a complex conductivity model that considers conduction of the diffuse layer and polarization of the Stern layer. Aggregate size distributions were inferred from inverted relaxation time distributions. We found that the negative and permanent surface charge of the basal plane of Na-Mt controls its quadrature (imaginary) conductivity, which is not very sensitive to pH and salinity (NaCl) in the 100 Hz to 45 kHz frequency range. For lower frequencies, the sudden increase of the quadrature conductivity at the highest salinities was explained by considering coagulation of Na-Mt particles.
Type de document :
Article dans une revue
Journal of Colloid and Interface Science, Elsevier, 2017, 505, pp.1093-1110. 〈10.1016/j.jcis.2017.06.071〉
Liste complète des métadonnées

Littérature citée [97 références]  Voir  Masquer  Télécharger

Contributeur : Nathalie Pothier <>
Soumis le : lundi 26 juin 2017 - 10:56:18
Dernière modification le : vendredi 14 décembre 2018 - 01:28:38
Document(s) archivé(s) le : mercredi 17 janvier 2018 - 15:13:55


Fichiers produits par l'(les) auteur(s)


Distributed under a Creative Commons Paternité - Pas d'utilisation commerciale - Pas de modification 4.0 International License



Philippe Leroy, Maximilian Weigand, Guillaume Mériguet, Egon Zimmermann, Christophe Tournassat, et al.. Spectral induced polarization of Na-montmorillonite dispersions. Journal of Colloid and Interface Science, Elsevier, 2017, 505, pp.1093-1110. 〈10.1016/j.jcis.2017.06.071〉. 〈insu-01546901〉



Consultations de la notice


Téléchargements de fichiers