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- W3175248510 abstract "In studies of glass-forming liquids, one of the important questions is to understand to which degree chemically different classes of liquids have the same type of dynamics. In this context, room-temperature ionic liquids are interesting because they exhibit both van der Waals and Coulomb interactions. In this work we study the $ensuremath{alpha}$ relaxation and faster relaxation dynamics in the room-temperature ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr14-TFSI). The paper presents quasielastic neutron and shear mechanical spectroscopy data measured over seven decades in frequency (${10}^{ensuremath{-}3}ensuremath{-}{10}^{4}$ Hz). The use of these two methods in combination reveal the $ensuremath{alpha}$ relaxation and four separate, faster modes. Two of these faster modes, based on the partial deuterations, can be assigned to the methyl group and the methyl end of the butyl chain of the cation. The neutron data are also used to determine the mean-square displacement (MSD) on the nanosecond timescale. It is shown that the temperature dependence of the MSD can account for the super-Arrhenius behavior of the $ensuremath{alpha}$ relaxation as predicted by the shoving model [Dyre, Rev. Mod. Phys. 78, 953 (2006)], similarly to what is seen in simpler glass-forming liquids." @default.
- W3175248510 created "2021-07-05" @default.
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- W3175248510 date "2021-06-25" @default.
- W3175248510 modified "2023-09-27" @default.
- W3175248510 title "High-frequency dynamics and test of the shoving model for the glass-forming ionic liquid Pyr14-TFSI" @default.
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- W3175248510 doi "https://doi.org/10.1103/physrevmaterials.5.065606" @default.
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