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High-frequency dyna...
High-frequency dynamics and test of the shoving model for the glass-forming ionic liquid Pyr14-TFSI
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- Eliasen, K. L. (author)
- Roskilde Universitet (RUC),Roskilde University (RUC)
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- Hansen, Henriette Wase (author)
- Roskilde Universitet (RUC),Roskilde University (RUC),Institut Laue-Langevin,Chalmers tekniska högskola,Chalmers University of Technology
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- Lundin, Filippa, 1992 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Rauber, Daniel (author)
- Universität des Saarlandes
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- Hempelmann, Rolf (author)
- Universität des Saarlandes
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- Christensen, Tage (author)
- Roskilde Universitet (RUC),Roskilde University (RUC)
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- Hecksher, Tina (author)
- Roskilde Universitet (RUC),Roskilde University (RUC)
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- Matic, Aleksandar, 1968 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Frick, Bernhard (author)
- Institut Laue-Langevin
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- Niss, Kristine (author)
- Roskilde Universitet (RUC),Roskilde University (RUC)
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(creator_code:org_t)
- 2021
- 2021
- English.
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In: Physical Review Materials. - 2475-9953. ; 5:6
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https://doi.org/10.1...
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Abstract
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- 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 α 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 (10-3-104 Hz). The use of these two methods in combination reveal the α 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 α relaxation as predicted by the shoving model [Dyre, Rev. Mod. Phys. 78, 953 (2006)RMPHAT0034-686110.1103/RevModPhys.78.953], similarly to what is seen in simpler glass-forming liquids.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
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- art (subject category)
- ref (subject category)
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Eliasen, K. L.
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Hansen, Henriett ...
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Lundin, Filippa, ...
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Rauber, Daniel
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Hempelmann, Rolf
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Christensen, Tag ...
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show more...
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Hecksher, Tina
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Matic, Aleksanda ...
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Frick, Bernhard
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Niss, Kristine
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Physical Chemist ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Other Physics To ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Materials Engine ...
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and Other Materials ...
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Physical Review ...
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Chalmers University of Technology