| Comment on : experimental evidence for fast heteorgeneous collective structural relaxation in a supercooled liquid near the glass transition (2001) | |||||||||||
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| Di usion binary gas mixtures studied NMR hyperpolarized gases and molecular dynamics simulations Acosta Agulles Pedro Komin Sebastiani Spiess and Blu mlerz Received June Accepted July First published Advance Article the web August DOI The dependence the individual mean square displacement rare gases binary mixtures studied combined experimental and theoretical approach show that the usion constant can varied considerable range changing the molar fractions the mixtures the experimental side NMR usion measurements are done hyperpolarized and mixed with several inert gases the presence magnetic eld gradient The results are compared usion coe cients obtained from atomistic molecular dynamics simulations based Lennard Jones type potentials the corresponding gas mixtures and appropriate analytical expressions yielding very good mutual agreement This study the rst quantitative validation the ects the mutual interactions between gas particles the individual usion properties shown that the dependency gas phase usion properties the local chemical environment may not neglected di usion controlled chemical reactions Introduction From the very beginning the application laser polarized noble gases and magnetic resonance imaging MRI usion measurements were envisioned tool for studying the microscopic structure respiratory organs This possible because the NMR signal acquired the presence magnetic eld gradient attenuated exponentially with the usion coe cient However the case liquids the usio | |||||||||||
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