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Materials 2013, 6(6), 2464-2482; doi:10.3390/ma6062464
Article

Interactions and Diffusion of Methane and Hydrogen in Microporous Structures: Nuclear Magnetic Resonance (NMR) Studies

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Received: 9 May 2013 / Revised: 4 June 2013 / Accepted: 5 June 2013 / Published: 17 June 2013
(This article belongs to the Special Issue Diffusion in Micropores and Mesopores 2013)
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Abstract

Measurements of nuclear spin relaxation times over a wide temperature range have been used to determine the interaction energies and molecular dynamics of light molecular gases trapped in the cages of microporous structures. The experiments are designed so that, in the cases explored, the local excitations and the corresponding heat capacities determine the observed nuclear spin-lattice relaxation times. The results indicate well-defined excitation energies for low densities of methane and hydrogen deuteride in zeolite structures. The values obtained for methane are consistent with Monte Carlo calculations of A.V. Kumar et al. The results also confirm the high mobility and diffusivity of hydrogen deuteride in zeolite structures at low temperatures as observed by neutron scattering.
Keywords: nuclear resonance; spin-lattice relaxation; heat capacity; mesoporous structures nuclear resonance; spin-lattice relaxation; heat capacity; mesoporous structures
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Ji, Y.; Sullivan, N.S.; Tang, Y.; Hamida, J.A. Interactions and Diffusion of Methane and Hydrogen in Microporous Structures: Nuclear Magnetic Resonance (NMR) Studies. Materials 2013, 6, 2464-2482.

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