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

Lima, Thamires A.; Li, Zhixia; Tyagi, Madhusudan; Ribeiro, Mauro C.  C.; Z, Y.

doi:10.1063/1.5081684

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

Journal Article · Wed Apr 10 00:00:00 UTC 2019 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.5081684· OSTI ID:1612077

^[1]; Li, Zhixia ^[2]; Tyagi, Madhusudan ^[3]; ^[4]; ^[2]

Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Sao Paulo (Brazil); DOE/OSTI
Univ. of Illinois at Urbana-Champaign, IL (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Univ. of Sao Paulo (Brazil)

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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: FAPESP; USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0014084

OSTI ID:: 1612077

Alternate ID(s):: OSTI ID: 1506171

Journal Information:: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 14 Vol. 150; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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

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