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- W2328681906 abstract "Neutron scattering has been used to reveal the structure and dynamics of molecular H2 physisorbed into the two-dimensional pores of sparingly hydrated Ca-laponite clay. Thermal pretreatment of the clay at 415 K under vacuum yielded an interlayer composition in the 1.0–1.5 water molecules per Ca2+ cation range and provided a vacant gallery height of 2.82 Å. This value is very well matched to the diameter of molecular hydrogen and allows intercalation of H2 up to the point where a liquid-like monolayer is formed within the clay. At a low coverage of 0.1 H2 per cation the isosteric heat of adsorption is 9.2 kJ mol–1. Quasielastic neutron scattering experiments conducted at 40–100 K reveal two populations of H2 within the clay. First, we find molecules that are localized close to the partially hydrated Ca2+ cations. Second, we identify a more mobile liquid-like population whose motion is captured by jump diffusion. At 40 K, the H2 diffusion coefficient is 2.3 ± 0.5 × 10–5 cm2 s–1. This is an order of magnitude slower than the value extrapolated from bulk liquid H2." @default.
- W2328681906 created "2016-06-24" @default.
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- W2328681906 date "2014-10-23" @default.
- W2328681906 modified "2023-09-23" @default.
- W2328681906 title "Structure and Dynamics of Molecular Hydrogen in the Interlayer Pores of a Swelling 2:1 Clay by Neutron Scattering" @default.
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- W2328681906 doi "https://doi.org/10.1021/jp5082356" @default.
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