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Investigation of molecular mobility and exchange of n-hexane and water in silicalite-1 by 2D ¹H NMR relaxometry.

Title: Investigation of molecular mobility and exchange of n-hexane and water in silicalite-1 by 2D ¹H NMR relaxometry.
Authors: Gizatullin, B. I.1,2, Savinkov, A. V.1 andrey.savinkov@gmail.com, Shipunov, T. V.1, Melnikova, D. L.1, Doroginitzky, M. M.1, Skirda, V. D.1
Source: Magnetic Resonance in Solids. 2018, Vol. 20 Issue 1, p1-9. 9p.
Subject Terms: *SILICALITE, *POROUS materials, *HEXANE, *ADSORPTION, *NUCLEAR magnetic resonance, *CRYSTAL structure
Abstract: Molecular mobility and exchange of adsorbed fluid in porous media of silicalite-1 were studied by twodimensional nuclear magnetic resonance (NMR) techniques in fully and partly saturated samples. Three porous volumes were determined in silicalite-1 where n-hexane and water molecules are adsorbed: intracrystallite channels, mesopores and intercrystallite space. The molecular exchange between all porous volumes was observed and typical exchange times were estimated for n-hexane and water. Using the exchange times the self-diffusion coefficients were estimated as D ~ 1.11×10-10 for n-hexane and D ~ 6.67×10-11 m²/s for water in fully saturated silicalite-1 and found in a good agreement with literature data. [ABSTRACT FROM AUTHOR]
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