The Molar Surface Free Gibbs Energy Of The Aqueous Solution Of Ionic Liquid [C_nmim][Ac](n=2,4,6)

The application of Ionic Liquids is constrained for their disadvantages such as high viscosity.Ionic Liquid solutions can improve these properties in some point so that expand the application rage.The physicochemical properties the aqueous solution of Ionic Liquids are important data for researching and applying Ionic Liquids.Predicting these properties could provide people more convenience to use them.In this article the aqueous solution of Acetic Ionic Liquids are regarded as the study subject.The surface tension and density of the aqueous solution of Acetic Ionic Liquids are determined under different temperature and different molar concentration.On the basis of Li’s model the molar surface Gibbs free energy of the ionic liquid solution was put forward as a new concept to be used to predict the surface tension.Values of molar surface Gibbs free energy for the aqueous solution of Acetic Ionic Liquids are calculated as well as predicted values of that.In terms of the molar surface Gibbs free energy,a new linear E?tv?s equation is obtained.E?tv?s equation is promoted to describe relationship between the surface tension and temperature.Each parameter has a clear physical meaning in the new E?tv?s equation.Using this new equation,the values of the molar surface enthalpy for aqueous[C_nmim][Ac](n=2,4,6)and molar surface Gibbs free energy for other aqueous ILs were calculated.It is proved that the molar surface enthalpy is a temperature-independent constant at some certain temperature.