Viscosities and refractive indices of binary mixtures of 1-butyl-3-methylimidazolium tetrafluoroborate and 1-butyl-2,3-dimethylimidazolium tetrafluoroborate with water at 298 K |
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| Authors: | Ibrahim Bou Malham Mireille Turmine |
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| Institution: | 1. Univ Pierre et Marie Curie-paris 6, Univ Paris-sud, CNRS, F-91405, Lab FAST, Bat 502, Campus Univ, Orsay F-91405, France;2. Université Pierre et Marie Curie-Paris 6, Ecole Nationale Supérieure de Chimie Paris-ENSCP, CNRS, UMR7575, Paris F-75005, France;3. Energétique et Réactivité aux Interfaces, UPMC, case 39, 4 place Jussieu, 75252 Paris Cedex 05, France |
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| Abstract: | Viscosities and refractive indices have been determined for (water + 1-butyl-3-methylimidazolium tetrafluoroborate) and (water + 1-butyl-2,3-dimethylimidazolium tetrafluoroborate) mixtures at 298.15 K, over the whole composition range. The refractive indices were compared with the predictions of the Lorentz–Lorenz, Wiener, and Gladstone–Dale equations. Viscosity deviations (Δη) and refractive index deviations (ΔnD) have been calculated and fitted to the Redlich–Kister polynomial equations. ΔnD are positive whereas Δη are negative over the entire mixture composition for the two salts. The influence of the structure of imidazolium cation on the above physicochemical properties was discussed. |
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