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Thermophysical Characterization of Two DyethylMethylAmmonium Ionic Liquids

NaFoMat Group. Applied Physic and Particle Physics Departments, Universidade de Santiago de Compostela, Campus Vida, 15782 Santiago, Spain
Authors to whom correspondence should be addressed.
Presented at the 22nd International Electronic Conference on Synthetic Organic Chemistry, 15 November–15 December 2018; Available Online:
Proceedings 2019, 9(1), 29;
Published: 14 November 2018
PDF [541 KB, uploaded 21 March 2019]


Density (ρ), speed of sound (U), and the derived magnitudes of two diethylmethylammoniumionic liquids (ILs) against temperature have been studied in this work. The chosen ILs were diethylmethylammonium trifluoromethanesulfonate [C2C2C1N][OTf] and diethylmethylammonium methanesulfonate [C2C2C1N][MeSO3]. In order to analyze the influence of water content, saturated and dried samples of these ILs were studied. The ILs were dried using a vacuum pump, and the saturation level (28% and 6% in weight for [C2C2C1N][MeSO3] and [C2C2C1N][OTf], respectively) was achieved by keeping the ILs in an open bottle at ambient temperature. Direct measurements of density and speed of sound were taken with an Anton Paar DSA 5000. Linear equations were used to express the correlation of both properties with temperature, and the thermal expansion coefficient, αp, and the adiabatic bulk modulus constant, KS, have been also obtained. Additionally, results were compared with previous literature data in order to have a deeper understanding of the liquid properties and detect possible anomalous behaviors. The effect of water content is different on both properties. Thus, the density of the samples slightly increases when water is removed, whereas the opposite behavior was found with regard to the speed of sound, which decreased when the water content was completely removed.
Keywords: density; velocity of sound; adiabatic bulk modulus constant; thermal expansion coefficient density; velocity of sound; adiabatic bulk modulus constant; thermal expansion coefficient
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Parajó, J.J., 1; Villanueva, M.; Fernández-Míguez, L.; Sotuela, F.; Doural, M.L.; Varela, L.M.; Salgado, J. Thermophysical Characterization of Two DyethylMethylAmmonium Ionic Liquids. Proceedings 2019, 9, 29.

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