Abstract : Montmorillonite has remarkable adsorption properties because of its high specific surface area and surface charge density. Its surface charge distribution is also anisotropic. The basal faces have a negative and permanent surface charge due to isomorphic substitutions in the crystal and the edge faces have a pH-dependent surface charge due to amphoteric surface sites. We propose low-frequency complex impedance measurements of Na-Mt dispersions in the unexplored frequency range [Hz kHz] to get information on surface charge distribution, size and shape of Na-Mt dispersions at various particles concentrations (weight fractions 0.5 to 5%), salinities (from 10-4 to 10-2 M NaCl), and pH (5 to 10).
https://hal-brgm.archives-ouvertes.fr/hal-01280362
Contributeur : Philippe Leroy
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Soumis le : lundi 29 février 2016 - 14:22:35
Dernière modification le : mercredi 21 mars 2018 - 18:57:40
Document(s) archivé(s) le : dimanche 13 novembre 2016 - 05:30:39
Philippe Leroy, Guillaume Mériguet, S Huisman, E Zimmermann, M Weigand, et al.. Spectral induced polarization of Na-montmorillonite dispersions. Goldschmidt 2016, Jun 2016, Yokohama, Japan. 2016. 〈hal-01280362〉
