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Article Dans Une Revue Microporous and Mesoporous Materials Année : 2013

Water behavior in hybrid silica gels as studied by 1H nuclear magnetic resonance relaxometry. Evidence of two hydration layers

Résumé

Water behavior in silica gels involving hydrophobic sites that have been substituted to hydrophilic sites has been approached by H-1 NMR relaxometry techniques. The latter method stems from the evolution of NMR longitudinal relaxation time T-1 as a function of the Larmor frequency (the NMR measurement frequency). T-1 measurements of the water protons have been carried out between 5 kHz and 10 MHz. This frequency range proved to be sufficient for detecting and characterizing two hydration layers although they exist in a very weak proportion (10(-5)-10(-6)). Self-diffusion coefficient of water in these two layers could be estimated. It turns out that only the first layer is influenced by hydrophobicity. (C) 2013 Elsevier Inc. All rights reserved.

Dates et versions

hal-01119439 , version 1 (23-02-2015)

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Citer

Djihad Oulkadi, Mehdi Yemloul, Sylvie Desobry-Banon, Daniel Canet. Water behavior in hybrid silica gels as studied by 1H nuclear magnetic resonance relaxometry. Evidence of two hydration layers. Microporous and Mesoporous Materials, 2013, 172, pp.213-216. ⟨10.1016/j.micromeso.2013.01.030⟩. ⟨hal-01119439⟩
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