控制碳氧功能化的离子液体的化温度和离子动力学
Alexander E Khudozhitkov1,2, Lasse Hunger3, Loai Al Sheakh3
1Novosibirsk State University, Pirogova Street 2, Novosibirsk 630090, Russia.
带有双键的阴离子二次体的碳氧功能化的离子液体具有低温度,这使得它们对电解质有希望. 它们的玻璃液体过渡和阴离子动态使用NMR光谱学进行了研究.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 频谱学是一种光谱学.
背景情况:
- 离子液体 (ILs) 是100°C以下液态的盐.
- 具有特定链的碳氧功能化ILs可以形成独特的键结构.
- 了解ILs的相位转换和动态对于其应用至关重要.
研究的目的:
- 研究碳氧功能化的离子液体[Py-(CH2) n-COOD][NTf2]的玻璃液相过渡和化温度.
- 使用NMR固态光谱学来描述这些ILs的离子动态和粘度.
- 根据它们的热性质,探索这些ILs作为电解质的潜力.
主要方法:
- 固态2HNMR光谱学被用来研究具有不同链长度的ILs (n=1,2,4,5,6,7,9).
- 使用NMR光谱分析来确定玻璃过渡温度 (Tg) 和融温度 (Tm).
- 测量了NMR放松时间 (T1和T2),以探测离子动态和粘度.
主要成果:
- 该研究确定了玻璃液相过渡,并确定了研究ILs的化温度 (Tm).
- 发现化温度 (Tm) 与玻璃化过渡温度 (Tg) 非常接近,Tm/Tg比为1.13.
- 核磁共振放松数据表明缓慢的同位素和快速的异位素运动的组合,在n > 4时观察到最佳粘度.
结论:
- 具有双键的碳氧功能化的IL由于其独特的结构特征,具有较低的化温度.
- 观察到的低Tm/Tg比表明液态内的动态异质性.
- 这些IL显示出作为电解质的使用潜力,因为它们具有有利的热性能和粘度.
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