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化工学报  2015 

咪唑型离子液体热物理性质测量

DOI: 10.11949/j.issn.0438-1157.20150087, PP. 49-53

Keywords: 离子液体,仪器,热传导,热扩散,热线法

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Abstract:

利用自行搭建的热线法液体热导率和热扩散系数装置测试了两种咪唑型离子液体([C6mIm][BF4]和[C4mIm][BF4])在不同温度下的热导率和热扩散系数。根据文献报道的密度数据获得了样品的比热容。结果表明:两种离子液体的热导率与温度的相关性不大;两种阳离子结构相似的离子液体热扩散率相近,热扩散率随温度的升高有明显的变化,本文认为离子液体内部的离子动量分布与温度紧密相关,离子间的动量交换随温度的升高而增加,离子动量分布随温度升高逐渐趋于一致,离子间碰撞产生的动量交换不再明显改变离子的动量,导致热扩散率的变化随温度升高而减小。

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