Etude infrarouge et isotopique de l'eau
adsorbée et confinée

Abstract : solid or “capillarized” inside porous medium. Two techniques were used to study them. Diffuse Reflectance Infrared spectroscopy made clear that adsorption and confinement (on oxides powders) imply a red-shift of the OH-stretching band of water. It means that water hydrogen bonds strengthened close to a hydrophilic surface. The two situations have been further distinguished using their desorption kinetics behaviour. Second, the liquid-vapor isotopic fractionation factor (a), recorded as a function of RH, showed three main domains. The first (RH < 60%) is characterized by an almost constant a, which was interpreted as defining a bi-dimensional film inside whom solid-liquid interactions predominate. From 60% to 80%, water-water intermolecular interactions made a sensitive to RH. At 80% RH, capillary condensation in thinner pores (10 nm) showed that this type of water has properties different from the bulk which has a greater a value. Semi-quantitative coupling between the results of the two techniques have been tentatively realized, and points to their good consistency.
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Thierry Richard. Etude infrarouge et isotopique de l'eau
adsorbée et confinée. Sciences de la Terre. Université Paris Sud - Paris XI, 2006. Français. ⟨tel-00399544⟩

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