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

Abstract : 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.
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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, Elsevier, 2013, 172, pp.213-216. ⟨10.1016/j.micromeso.2013.01.030⟩. ⟨hal-01119439⟩

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