利用标准加入法研究离子液体EMIBF_4的密度和表面张力  

Study on the Density and Surface Tension of Ionic Liquid EMIBF_4 in Terms of Standard Addition Method

作　　者：杨家振[1] 李景斌[1] 佟静[1] 洪梅[1] 

机构地区：[1]辽宁大学化学院,沈阳110036

出　　处：《化学学报》2007年第8期655-659,共5页Acta Chimica Sinica

摘　　要：在278.15～338.15 K温度范围内,分别用Anton Paar密度计和最大气泡法测定了含有不同微量水的离子液体EMIBF_4(1-ethyl-3-methylimidazolium tetrafluoroborate)的密度和表面张力,讨论了微量水对这些性质的影响,进而用标准加入法确定了无水离子液体EMIBF_4的密度和表面张力,借助Glasser理论和空隙模型讨论了EMIBF_4的热力学性质。用空隙模型计算的离子液体热膨胀系数与实验测定值较好一致,说明空隙模型具有合理性。In terms of standard addition method, the density and surface tension of ionic liquid EMIBF4 （1-ethyl-3-methylimidazolium tetrafluoroborate） were measured in the temperature range of 278.15 to 338.15 K. The properties of volume and surface for pure EMIBF4 were discussed in terms of the interstice model and Glasser＇s theory. The thermal expansion coefficient a=6.23× 10^-4K^-1 calculated using interstice model is closed to experimental a=5.86×10^-4 K^-1. This result means that the interstice model is reasonable.

关 键 词：离子液体 标准加入法 密度 表面张力 

分 类 号：O621.2[理学—有机化学]