Article ID Journal Published Year Pages File Type
217025 The Journal of Chemical Thermodynamics 2008 6 Pages PDF
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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