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Spectral induced polarization of Na-montmorillonite dispersions
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. French Geol Survey, BRGM, F-45060 Orleans, France.
Univ Bonn, Steinmann Inst, Dept Geophys, D-53115 Bonn, Germany..
Pierre & Marie Curie Univ, PHENIX, CNRS, UMR 8234, F-75252 Paris, France..
Forschungszentrum Julich, Cent Inst Engn Elect & Analyt, Elect Syst, ZEA 2, D-52425 Julich, Germany..
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2017 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 505, 1093-1110 p.Article in journal (Refereed) Published
Abstract [en]

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 0.5-5.2% 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 (NaCI) 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.

Place, publisher, year, edition, pages
ACADEMIC PRESS INC ELSEVIER SCIENCE , 2017. Vol. 505, 1093-1110 p.
Keyword [en]
Na-montmorillonite, Dispersions, Spectral induced polarization, Conductivity, Dielectric permittivity, Basal plane, Surface charge, Stern layer, Diffuse layer
National Category
Geochemistry
Identifiers
URN: urn:nbn:se:uu:diva-335115DOI: 10.1016/j.jcis.2017.06.071ISI: 000410464100117PubMedID: 28697548OAI: oai:DiVA.org:uu-335115DiVA: diva2:1161972
Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2017-12-01Bibliographically approved

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Fagerlund, Fritjof

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