文献类型：期刊文献

英文题名：Asymmetric criticality of binary ionic solutions containing 1-butyl-3-methylimidazolium tetrafluoroborate and alcohol

作者：Yin, Tianxiang[1];Xu, Chen[1];Lv, Hekun[2];Liu, Shixia[1];Wang, Mingjie[1];Chen, Zhiyun[1];Shen, Weiguo[1,2]

机构：[1]E China Univ Sci & Technol, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]Lanzhou Univ, Dept Chem, Lanzhou 730000, Gansu, Peoples R China

年份：2014

卷号：16

期号：33

起止页码：17715

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000341064800040)】；

基金：This work was supported by the National Natural Science Foundation of China (Projects 21173080, 21373085 and 21303055).

语种：英文

摘要：The liquid-liquid coexistence curves for binary solutions {1-butyl-3-methylimidazolium tetrafluoroborate ([C(4)mim][BF4]) + 1-propanol) and (1-butyl-3-methylimidazolium tetrafluoroborate ([C(4)miml]BF4]) + 2-propanol) have been precisely measured. The values of the critical exponents) beta obtained from the liquid liquid equilibrium data in the critical region confirmed the 3D-Ising universality. The isobaric heat capacities per unit volume were measured for {[C(4)mim][BF4] + 1-propanol (or 2-propanol, 1,3-propanediol, 1,4-butanediol)) in both critical and non-critical regions. The experimental results indicate a major solvophobic contribution to the criticality for the studied ionic solutions. The complete scaling theory was applied to well represent the asymmetric behavior of the diameter of the coexistence curves with the consideration of the heat capacity contribution. It was found that the contribution of the heat capacity related term in the ionic solution decreased with the increase of the permittivity of alcohol and was more important in the description of the asymmetry of the coexistence curve of the ionic solutions than that of the molecular solutions.