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Magnetic orientation of nontronite clay in aqueous dispersions and its effect on water diffusion
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry. St. Petersburg State University, Russian Federation.ORCID iD: 0000-0002-6524-1441
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2015 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 437, 205-210 p.Article in journal (Refereed) Published
Abstract [en]

The diffusion rate of water in dilute clay dispersions depends on particle concentration, size, shape, aggregation and water-particle interactions. As nontronite clay particles magnetically align parallel to the magnetic field, directional self-diffusion anisotropy can be created within such dispersion. Here we study water diffusion in exfoliated nontronite clay dispersions by diffusion NMR and time-dependant 1H-NMR-imaging profiles. The dispersion clay concentration was varied between 0.3 and 0.7 vol%. After magnetic alignment of the clay particles in these dispersions a maximum difference of 20% was measured between the parallel and perpendicular self-diffusion coefficients in the dispersion with 0.7 vol% clay. A method was developed to measure water diffusion within the dispersion in the absence of a magnetic field (random clay orientation) as this is not possible with standard diffusion NMR. However, no significant difference in self-diffusion coefficient between random and aligned dispersions could be observed.

Place, publisher, year, edition, pages
2015. Vol. 437, 205-210 p.
Keyword [en]
Nontronite clay, Magnetic alignment, Exfoliated clay, Anisotropic microstructure, Diffusion, Permeability, Bound water, NMR 1D imaging, Diffusion NMR
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-158797DOI: 10.1016/j.jcis.2014.09.031ISI: 000345109000027ScopusID: 2-s2.0-84908331427OAI: diva2:787888

QC 20150212

Available from: 2015-02-12 Created: 2015-01-12 Last updated: 2015-02-12Bibliographically approved

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Dvinskikh, Sergey V.
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