Gómez Elena, Velho Pedro, Domínguez Ángeles, Macedo Eugénia A
Associate Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal.
Advanced Separation Processes Group, Department of Chemical Engineering, University of Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain.
Molecules. 2021 Oct 22;26(21):6383. doi: 10.3390/molecules26216383.
Ionic liquids (ILs) are being widely studied due to their unique properties, which make them potential candidates for conventional solvents. To study whether binary mixtures of pure ionic liquids provide a viable alternative to pure ionic liquids for different applications, in this work, the thermal analysis and molar heat capacities of five equimolar binary mixtures of ionic liquids based on imidazolium, pyridinium, pyrrolidinium, and piperidinium cations with dicyanamide, trifluoromethanesulfonate, and bis(trifluoromethylsulfonyl)imide anions have been performed. Furthermore, two pure ionic liquids based on piperidinium cation have been thermally characterized and the heat capacity of one of them has been measured. The determination and evaluation of both the transition temperatures and the molar heat capacities was carried out using differential scanning calorimetry (DSC). It was observed that the thermal behavior of the mixtures was completely different than the thermal behavior of the pure ionic liquids present, while the molar heat capacities of the binary mixtures were very similar to the value of the average of molar heat capacities of the two pure ionic liquids.
离子液体（ILs）因其独特的性质而受到广泛研究，这些性质使其成为传统溶剂的潜在候选者。为了研究纯离子液体的二元混合物是否能为不同应用提供一种可行的替代纯离子液体的选择，在本工作中，我们对基于咪唑鎓、吡啶鎓、吡咯烷鎓和哌啶鎓阳离子与双氰胺、三氟甲磺酸盐和双（三氟甲基磺酰）亚胺阴离子的五种等摩尔离子液体二元混合物进行了热分析和摩尔热容测定。此外，还对两种基于哌啶鎓阳离子的纯离子液体进行了热表征，并测量了其中一种的热容。使用差示扫描量热法（DSC）进行了转变温度和摩尔热容的测定与评估。结果发现，混合物的热行为与所存在的纯离子液体的热行为完全不同，而二元混合物的摩尔热容与两种纯离子液体摩尔热容平均值的值非常相似。
