Influence of water and ethanol in the physical properties of choline glycinate at several temperatures

Abstract

In this study, a physical characterization (density (q), refractive index (nD), speed of sound (u) and dynamic viscosity (g)) as a function of temperature (298.15–343.15 K) of choline glycinate (ChGly) and its binary mixtures with water or/and methanol over the entire composition range was performed from 298.15 K to 323.15 K. Several derived properties of the pure ionic liquid and excess molar volume (VE m) changes of refractive index on mixing (DnD), deviations in isentropic compressibility (DjS) and viscosity deviations (Dg) have been calculated using the experimental data in the selected temperature range. These experimental data of ChGly have been positively correlated using polynomial equations and the derived magnitudes were successfully fitted to Redlich-Kister equation. Finally, different models have been implemented for the first time to predict the density of the selected binary mixtures as a function of the temperature.