Abstract
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.
Highlights
In recent years, both the thermophysical properties and the application of ionic liquids (ILs) in different processes have been widely studied
The results obtained in this work for the mixtures were compared with the thermal behavior and the molar heat capacities of the respective pure ionic liquids previously published by the group
The transition temperatures for two pure piperidinium-based ionic liquids and the heat capacities for one pure piperidinium-based ionic liquid were measured in an assay
Summary
Both the thermophysical properties and the application of ionic liquids (ILs) in different processes have been widely studied This high interest in these compounds is mainly due to their special characteristics such as low vapor pressure and their high solvent power for a wide variety of chemical compounds, both polar and nonpolar. They are liquid in a wide range of temperatures, which makes them more versatile. There are many studies on the thermal analysis of pure ILs, there is a lack of studies related to heat capacities and transition temperatures of binary mixtures of ionic liquids in the literature [1,2,3,4,5,6,7]
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