中文摘要：

采用MDY-2型密度仪在常压、一定温度范围内对离子液体1-乙基-3-甲基咪唑硝酸盐（简写为[C2mim]NO3）和1-乙基-3-甲基咪唑硫酸甲酯盐（简写为[C2mim][MetSO4]）的密度进行了测定。结果表明,离子液体的密度随温度升高呈线性下降的趋势。由离子液体的密度值计算得到离子液体[C2mim]NO3和[C2mim][MetSO4]的热扩散系数α值分别为6.75×10-4K-1和5.79×10-4K-1。在298.15 K和313.15 K下,分别对2种离子液体的分子体积、标准熵、晶格能等热力学性质进行了讨论。

英文摘要：

The density of 1-ethyl-3-methylimidazolium nitrate and 1-ethyl-3-methylimidazolium methylsulfate were measured by MDY-2 densimeters at various temperatures.The results showed that the density of Ionic liquids is a linear decrease with the increase of temperature.The coefficients of thermal expansion α of the two ionic liquids were obtained by calculating from the experimental density values.The values of α were 6.75×10-4 K-1and 5.79×10-4 K-1,respctively.At 298.15 K and 313.15 K,molecular volumes,standard entropies and lattice energy of these ILs were also discussed.