Nanoscopic length scale dependence of hydrogen bonded molecular associates' dynamics in methanol

The Journal of Chemical Physics
C E BertrandA Faraone

Abstract

In a recent paper [C. E. Bertrand et al., J. Chem. Phys. 145, 014502 (2016)], we have shown that the collective dynamics of methanol shows a fast relaxation process related to the standard density-fluctuation heat mode and a slow non-Fickian mode originating from the hydrogen bonded molecular associates. Here we report on the length scale dependence of this slow relaxation process. Using quasielastic neutron scattering and molecular dynamics simulations, we show that the dynamics of the slow process is affected by the structuring of the associates, which is accessible through polarized neutron diffraction experiments. Using a series of partially deuterated samples, the dynamics of the associates is investigated and is found to have a similar time scale to the lifetime of hydrogen bonding in the system. Both the structural relaxation and the dynamics of the associates are thermally activated by the breaking of hydrogen bonding.

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Feb 10, 2017·The Journal of Chemical Physics·C E BertrandA Faraone

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Citations

Apr 26, 2019·Physical Chemistry Chemical Physics : PCCP·Tilo SeydelKatharina Edkins
Nov 7, 2019·Physical Chemistry Chemical Physics : PCCP·Peter WeiglThomas Blochowicz
Jun 11, 2019·The Journal of Physical Chemistry Letters·Riccardo DettoriDavide Donadio
Jan 2, 2018·The Journal of Physical Chemistry Letters·Tsuyoshi YamaguchiMakoto Seto
Jan 18, 2018·The Journal of Physical Chemistry. B·A FaraoneE Mamontov

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