Inelastic neutron scattering study on boson peaks of imidazolium-based ionic liquids

Kofu, Maiko; Inamura, Yasuhiro; Podlesnyak, Andrey A.; Ehlers, Georg; Yamamuro, Osamu; Moriya, Yosuke

doi:10.1016/j.molliq.2015.07.021

Title: Inelastic neutron scattering study on boson peaks of imidazolium-based ionic liquids

Journal Article · Sun Jul 26 00:00:00 EDT 2015 · Journal of Molecular Liquids

DOI:https://doi.org/10.1016/j.molliq.2015.07.021· OSTI ID:1214030

Kofu, Maiko ^[1]; Inamura, Yasuhiro ^[1]; Podlesnyak, Andrey A. ^[2]; Ehlers, Georg ^[2]; Yamamuro, Osamu ^[1]; Moriya, Yosuke ^[1]

Univ. of Tokyo, Chiba (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Low energy excitations of 1-alkyl-3-methylimidazolium ionic liquids (ILs) have been investigated by means of neutron spectroscopy. In the spectra of inelastic scattering, a broad excitation peak referred to as a “boson peak” appeared at 1–3 meV in all of the ILs measured. The intensity of the boson peak was enhanced at the Q positions corresponding to the diffraction peaks, reflecting the in-phase vibrational nature of the boson peak. Furthermore the boson peak energy (E_BP) was insensitive to the length of the alkyl-chain but changed depending on the radius of the anion. From the correlation among E_BP, the anion radius, and the glass transition temperature T_g, we conclude that both E_BP and T_g in ILs are predominantly governed by the inter-ionic Coulomb interaction which is less influenced by the alkyl-chain length. Furthermore, we also found that the E_BP is proportional to the inverse square root of the molecular weight as observed in molecular glasses.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1214030

Alternate ID(s):: OSTI ID: 1250296

Journal Information:: Journal of Molecular Liquids, Vol. 210, Issue 1; ISSN 0167-7322

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Title: Inelastic neutron scattering study on boson peaks of imidazolium-based ionic liquids

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