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Thermophysical Study of Pyridinium-Based Ionic Liquids Sharing Ions
Christian Reinado1, Adrián Pelegrina1, Miguel Sánchez-Rubio1
1Departamento de Química Física, Facultad de Ciencias, Universidad de Zaragoza, 50009, Zaragoza, Spain.
This study measured thermophysical properties of pyridinium-based ionic liquids, including density and viscosity, across various temperatures. Results provide crucial data for understanding these materials in different thermal environments.
Area of Science:
- Physical Chemistry
- Materials Science
Background:
- Ionic liquids (ILs) are tunable solvents with unique properties.
- Understanding their thermophysical behavior is crucial for applications.
Purpose of the Study:
- To measure and correlate thermophysical properties of specific pyridinium-based ILs.
- To provide experimental data for 1-butylpyridinium bis(trifluoromethyl-sulfonyl)imide, 1-hexylpyridinium bis(trifluoromethylsulfonyl)imide, and 1-hexylpyridinium tetrafluoroborate.
Main Methods:
- Experimental measurement of density, speed of sound, refractive index, surface tension, heat capacity, viscosity, and conductivity.
- Temperature correlation of properties from 278.15 K to 338.15 K at atmospheric pressure.
- Calculation of derived properties like dynamic viscosity and isentropic compressibility.
Main Results:
- Density, speed of sound, and conductivity generally decreased with increasing temperature.
- Viscosity and heat capacity showed complex temperature dependencies.
- Refractive index and surface tension exhibited clear trends with temperature.
Conclusions:
- The study provides a comprehensive dataset on the thermophysical properties of selected pyridinium-based ILs.
- Temperature significantly influences the measured properties, with varying degrees of impact.
- The data aids in the selection and application of these ILs in thermal processes.
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