Influence of calcium interlayer cations on confined water atomic vibrations in swelling clays with contrasted hydrophobic properties.
Hectorite is a swelling clay mineral formed by two tetrahedral sheets sandwiching a central octahedral sheet. This last is constituted by magnesium atoms with a few substitutions by lithium atoms. Isomorphic substitutions generate a negative layer charge balanced by hydrated interlayer cations. Anionic substitutions with fluorine (F-Hect) replacing structural hydroxyl groups (OH-Hect) induce the reduction of water content in the interlayer space of F-Hect as confirmed by gravimetric, X-ray diffraction experiments and molecular simulations. Water organization is also affected, atomic vibrations signal indicates an isotropic environment of the confined water molecules in F-Hect in contrast with the known anisotropic character of confined water in OH-Hect. These results were restricted to samples with sodium as interlayer cations. To improve the F-Hect characterization, we now wish to study the same samples saturated with calcium, well known to impact the organization and dynamics of confined water. The impact of both cation and anionic field on the librational bands of interlayer water would thus be studied. Such experiment is estimated to 5 days of beam time on Lagrange.
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DAZAS Baptiste; FERRAGE Eric; JIMENEZ RUIZ Monica; LANSON Bruno and MICHOT Laurent. (2019). Influence of calcium interlayer cations on confined water atomic vibrations in swelling clays with contrasted hydrophobic properties.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-04-161
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