Abstract
We have measured the heat capacity and neutrion quasi‐ and inelastic scattering spectra of some salts of 1‐butyl‐3‐methylimidazolium ion bmim+, which is a typical cation of room‐temperature ionic liquids, and its derivatives. The heat capacity measurements revealed that the room‐temperature ionic liquids have glass transitions as molecular liquids. The temperature dependence of configurational entropy demonstrated that the room‐temperature ionic liquids are “fragile liquids”. Both heat capacity and inelastic neutron scattering data revealed that the glassy phases exhibit large low‐energy excitations usually called “boson peak”. The quasielastic neutron scattering data showed that so‐called “fast process” appears around Tg as in molecular and polymer glasses. The temperature dependence of the self‐diffusion coefficient derived from the neutron scattering data indicated that the orientation of bmim+ ions and/or butyl‐groups of bmim+ ions is highly disordered and very flexible in an ionic liquid phase.
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