Innovative Development of Material Science with Ultra-Sensitive Calorimetory

本研究的主要对象和现象是室温离子液体的相行为。RTIL是一类新型的功能液体，由于其独特的性质和潜在的应用前景而备受关注。独特的性能显着地表现在它们的热行为，如低熔点，尽管是盐，结晶硬度，预熔在很宽的温度范围内，过度过冷，和复杂的热历史的存在。我们使用超灵敏量热计、拉曼散射和核磁共振弛豫时间对量热进行了测量。从这些实验中，我们发现了特殊的热行为的相变RTIL，即“节奏熔化和结晶”，“间歇结晶”在预熔区和超低相变。这些独特的热行为的咪唑类RTIL归因于构象的变化和组成离子的灵活性。

The main samples and phenomena of this study are phase behabiors of room-temperature ionic liquids (RTILs). RTILs constitute a new class of liquids that attract much attention because of their characteristic properties and potential utilities as functional liquids. Unique properties are remarkably manifested in their thermal behaviors such as low melting point despite being salts, hardness in crystallization, premelting over a wide temperature range, excessive supercooling, and the existence of complex thermal histories. We performed the measurements of calorimetories using ultra-sensitive calorimeters, Raman scattering and relaxation times of NMR. From these experiments, we found peculiar thermal behaviours at the phase changes of RTILs, namely ‘rhythmic melting and crystallization', ‘intermittent crystallization' in the premelting regions and ultraslow phase changes. These unique thermal behaviours of imidazolium-based RTILs are attributed to conformational changes and flexibility of constituent ions.