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Title: Spatial and thermal signatures of α and β relaxations in glassy and glacial aliphatic ionic liquids

Abstract

The competition between Coulomb and van der Waals interactions brings forth unique dynamic features and broad applications to ionic liquids. Herein, we present a combined calorimetric, X-ray diffraction, incoherent elastic, and quasi-elastic neutron scattering study, over a wide temperature range (180–340 K), of the relaxational dynamics of the liquid, supercooled liquid, crystalline, glassy, and glacial states of two model ionic liquids: tributylmethylammonium (a good glass-former) and butyltrimethylammonium (a good crystal-former) cations and the bis(trifluoromethanesulfonyl)imide anion. In both systems, we observed two distinct relaxation processes. Finally, the Q-dependence of the respective relaxation time shows that the α-process is diffusive, while the β-process is modulated by the structure of the liquids.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [2]
+ Show Author Affiliations
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Sao Paulo (Brazil)
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  4. Univ. of Sao Paulo (Brazil)
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); FAPESP
OSTI Identifier:
1612077
Alternate Identifier(s):
OSTI ID: 1506171
Grant/Contract Number:  
SC0014084; 2016/24241-5; 2012/13119-3; SC0014804
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 150; Journal Issue: 14; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Chemistry; Physics; Crystallography; Glass transitions; Neutron scattering; Thermodynamic measurements and instrumentation; X-ray diffraction; Ionic liquid; Van der Waals forces; Diffusion; Differential scanning calorimetry; Neutron spectroscopy

Citation Formats

Lima, Thamires A., Li, Zhixia, Tyagi, Madhusudan, Ribeiro, Mauro C. C., and Z, Y. Spatial and thermal signatures of α and β relaxations in glassy and glacial aliphatic ionic liquids. United States: N. p., 2019. Web. doi:10.1063/1.5081684.
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Lima, Thamires A., Li, Zhixia, Tyagi, Madhusudan, Ribeiro, Mauro C. C., & Z, Y. Spatial and thermal signatures of α and β relaxations in glassy and glacial aliphatic ionic liquids. United States. https://doi.org/10.1063/1.5081684
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Lima, Thamires A., Li, Zhixia, Tyagi, Madhusudan, Ribeiro, Mauro C. C., and Z, Y. Wed . "Spatial and thermal signatures of α and β relaxations in glassy and glacial aliphatic ionic liquids". United States. https://doi.org/10.1063/1.5081684. https://www.osti.gov/servlets/purl/1612077.
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@article{osti_1612077,
title = {Spatial and thermal signatures of α and β relaxations in glassy and glacial aliphatic ionic liquids},
author = {Lima, Thamires A. and Li, Zhixia and Tyagi, Madhusudan and Ribeiro, Mauro C. C. and Z, Y.},
abstractNote = {The competition between Coulomb and van der Waals interactions brings forth unique dynamic features and broad applications to ionic liquids. Herein, we present a combined calorimetric, X-ray diffraction, incoherent elastic, and quasi-elastic neutron scattering study, over a wide temperature range (180–340 K), of the relaxational dynamics of the liquid, supercooled liquid, crystalline, glassy, and glacial states of two model ionic liquids: tributylmethylammonium (a good glass-former) and butyltrimethylammonium (a good crystal-former) cations and the bis(trifluoromethanesulfonyl)imide anion. In both systems, we observed two distinct relaxation processes. Finally, the Q-dependence of the respective relaxation time shows that the α-process is diffusive, while the β-process is modulated by the structure of the liquids.},
doi = {10.1063/1.5081684},
journal = {Journal of Chemical Physics},
number = 14,
volume = 150,
place = {United States},
year = {Wed Apr 10 00:00:00 EDT 2019},
month = {Wed Apr 10 00:00:00 EDT 2019}
}
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https://doi.org/10.1063/1.5081684
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