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

Materials

Yu Ji²  Neil S. Sullivan¹  Yibing Tang² 

[1] Department of Physics, University of Florida, Gainesville, FL 32611, USA;

关键词: nuclear resonance;    spin-lattice relaxation;    heat capacity;    mesoporous structures;   

DOI  :  10.3390/ma6062464

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.