文献类型：期刊文献

英文题名：The heat capacities and critical behaviors of binary ionic solutions

作者：Wang, Xue[1];Xu, Chen[1];Tao, Xiaoyi[1];Yin, Tianxiang[1];Chen, Zhiyun[1];Shen, Weiguo[1,2]

机构：[1]East 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：2018

卷号：20

期号：14

起止页码：9130

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000429205700012)】；

基金：This study was supported by the National Natural Science Foundation of China (Projects 21373085, 21403067 and 21303055).

语种：英文

摘要：The heat capacities of nine binary room temperature ionic solutions {[C(4)mim][BF4] + 1,2-butandiol}, {[C(8)mim][BF4] + 1-pentanol}, {[C(8)mim][BF4] + 2-pentanol}, {[C(8)mim][BF4] + 1-hexanol}, {[C(8)mim][BF4] + 1-heptanol}, {[C(8)mim][PF6] + 1-propanol}, {[C(8)mim][PF6] + 1-butanol}, {[C(8)mim][PF6] + 2-butanol} and {[C(8)mim][PF6] + tert-butanol} are reported herein. The combination of the data obtained with the corresponding measured coexistence curves infers that the critical asymmetry parameter of the coexistence curves linearly varies with the molar volume ratio of the two components for each of the studied binary ionic solutions after the heat capacity contribution is considered. This indicates the importance of the heat capacity contribution to the critical asymmetry. For further analysis of the critical characteristics of the ionic solutions, a large amount of experimental data was collected and systematically discussed in detail regarding which critical character is important in the binary ionic solutions. A general increasing tendency for the RPM (restricted primitive model)-rescaled critical parameters with the relative permittivity epsilon(r,c) of the solvent at the critical temperature of the corresponding system was found. This is attributed not only to the screening effect of the solvent medium, but also to solvophobic interactions, which both increase with er, c. This study also demonstrates that the critical amplitudes increased, while the relative contribution of the heat capacity to the asymmetry of the coexistence curve decreased with an increase in epsilon(r,c).