Geometry and Dynamics of Intercalated Water in Na-Fluorhectorite Clay Hydrates

Proton and deuterium NMR measurements are performed in Na-fluorhectorite powdered samples. The results are compared with NMR data from other 2:1 clays, and with the recent results of molecular simulations, they yield new information about the factors governing the geometry and dynamics of intercalat...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2008-01, Vol.112 (2), p.575-580
Main Authors: Tenório, Rômulo P, Alme, Lars Ramstad, Engelsberg, Mario, Fossum, Jon Otto, Hallwass, Fernando
Format: Article
Language:English
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Summary:Proton and deuterium NMR measurements are performed in Na-fluorhectorite powdered samples. The results are compared with NMR data from other 2:1 clays, and with the recent results of molecular simulations, they yield new information about the factors governing the geometry and dynamics of intercalated water in these materials. In the one-water layer regime, two different sites were identified, permitting us to elucidate the structure of interlamellar water. The role of proton exchange appears to be more pronounced in Na−Fht than in Na−vermiculite and is not limited to the 2WL regime. It appears to be promoted by a considerable amount of interlamellar water outside the hydration sphere of the cation.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp0766407