The Density and Surface Tension of Aqueous Solutions of Propionate Ionic Liquids: [C4mim][Pro] and [C6mim][Pro] at Different Temperatures
The Density and Surface Tension of Aqueous Solutions of Propionate Ionic Liquids: [C4mim][Pro] and [C6mim][Pro] at Different Temperatures
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DOI：
10.1007/s10953-015-0423-0
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发表时间：
2016-01
影响因子：
1.2
通讯作者：
J. Tong;Teng-Fei Chen;Lin-Fu Wang;Duo Zhang;Qi Yang;Jia-zhen Yang
中科院分区：
文献类型：
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作者：
J. Tong;Teng-Fei Chen;Lin-Fu Wang;Duo Zhang;Qi Yang;Jia-zhen Yang
采用中和法制备了丙酸离子液体1-烷基-3-甲基咪唑丙酸[C4mim][Pro]和[C6mim][Pro]，并用1h NMR波谱和差示扫描量热法对其进行了表征。测定了不同摩尔浓度[C4mim][Pro]和[C6mim][Pro]水溶液在不同温度下的密度和表面张力值，并计算了这些溶液的热膨胀系数、表观摩尔体积和降落伞。由表观摩尔体积计算得到的溶质表观摩尔膨胀率与哈内德-欧文方程计算的值吻合较好。提出了预测[C4mim][Pro]和[C6mim][Pro]水溶液表面张力的经验方程，该经验方程预测的表面张力值与相应的实验值和降落伞半经验方法预测的结果非常相似，且高度相关。
The propionate acid ionic liquids, 1-alkyl-3-methylimidazolium propionate [C4mim][Pro] and [C6mim][Pro] were prepared by the neutralization method and characterized by1H NMR spectroscopy and differential scanning calorimetry. The values of density and surface tension of aqueous [C4mim][Pro] and [C6mim][Pro] with various molalities were determined at different temperatures, and the coefficient of thermal expansion, the apparent molar volume and the parachor for these solutions were calculated. The values of the apparent molar expansibility of the solute obtained from data of the apparent molar volume are in good agreement with the values calculated by the Harned–Owen equation. An empirical equation for prediction of surface tension for aqueous [C4mim][Pro] and [C6mim][Pro] was put forward and the values of the surface tension predicted by the empirical equation are very similar and highly correlated with the corresponding experimental values and the results predicted by the parachor semi-empirical method for solutions.