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Issue 36, 2006
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Diffusion in binary gas mixtures studied by NMR of hyperpolarized gases and molecular dynamics simulations

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Abstract

The dependence of the individual mean square displacement of rare gases in binary mixtures is studied by a combined experimental and theoretical approach. We show that the diffusion constant can be varied in a considerable range by changing the molar fractions of the mixtures. On the experimental side, NMR diffusion measurements are done on hyperpolarized 3He and 129Xe, mixed with several inert buffer gases, in the presence of a magnetic field gradient. The results are compared to diffusion coefficients obtained from atomistic molecular dynamics simulations based on Lennard-Jones type potentials of the corresponding gas mixtures, and to appropriate analytical expressions, yielding very good mutual agreement. This study is the first quantitative validation of the effects of the mutual interactions between gas particles on the individual diffusion properties. It is shown that the dependency of gas phase diffusion properties on the local chemical environment may not be neglected, e.g. in diffusion-controlled chemical reactions.

Graphical abstract: Diffusion in binary gas mixtures studied by NMR of hyperpolarized gases and molecular dynamics simulations

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Publication details

The article was received on 30 Jun 2006, accepted on 31 Jul 2006 and first published on 14 Aug 2006


Article type: Paper
DOI: 10.1039/B609316G
Phys. Chem. Chem. Phys., 2006,8, 4182-4188

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    Diffusion in binary gas mixtures studied by NMR of hyperpolarized gases and molecular dynamics simulations

    R. H. Acosta, L. Agulles-Pedrós, S. Komin, D. Sebastiani, H. W. Spiess and P. Blümler, Phys. Chem. Chem. Phys., 2006, 8, 4182
    DOI: 10.1039/B609316G

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