Study of effect of water on the physicochemical properties of 1-buthyl-3-methylimidazolium Chloride ionic liquids

摘要

The density, viscosity, conductivity and the electrochemical window of 1-buthyl-3-methylimidazolium Chloride ionic liquids([Bmim]Cl) and its water mixture have been determined at 298.15 K and atmospheric pressure. It was found that the density and conductivity of [Bmim]Cl/water, increase with the increase the water concentration at the same temperature, whereas the viscosity and electrochemical windows of [Bmim]Cl/water decrease. The viscosity of pure ionic liquids decreases with the increase of the temperature, whereas the conductivity increases. The relationship between the conductivity and the temperature agrees well with the Arrhenius equation k=k_∞exp[-E_a/k_BT] and the active energy of conduction is determined accordingly.