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Glass Transitions and Low-Frequency Dynamics of Room-Temperature Ionic Liquids

机译：室温离子液体的玻璃转变和低频动力学

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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.
机译：我们已经测量了一丁基-3-甲基咪唑离子Bmim +的一些盐的热容量和中性散射光谱，其是室温离子液体的典型阳离子及其衍生物。热容量测量显示室温离子液体具有玻璃过渡作为分子液体。配置熵的温度依赖性表明室温离子液体是“脆弱的液体”。热容量和无弹性中子散射数据均显示玻璃相表现出通常称为“玻色子峰”的大量低能量激励。准弹性中子散射数据显示，如所谓的“快速过程”，如分子和聚合物眼镜中的Tg周围出现。来自中子散射数据的自扩散系数的温度依赖性表明，Bmim +离子和/或Bmim +离子的丁基组的取向在离子液相中具有高度无序的并且非常柔韧。

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