Determination of density and conductivity of the binary mixtures of the ionic liquid l,2-dimethyl-3-hexylimidazolium bis(trifluoromethylsulfonyl)imide and dimethyl carbonate via mole fraction and temperature

摘要

Modeling of both conductivity, σ, and density, p, as a function of mole fraction, x, and temperature, T, is a crucial method to determine the physical properties of ionic liquids. The first objective of this work was to find out an applicable method of using x and T to predict the p of the binary mixtures of l,2-dimethyl-3-hexylimidazolium bis(trifluoromethylsul-fonyl)imide ([DMHIM][Tf2N]) and dimethyl carbonate (DMC). Predicated on non-linear curve fitting, a typical numerical method is used to quantitatively analyze the × together with T-dependent p. The simulations agree very well with the observed spectra (p versus both x and 7). The second objective of this work was to find out the mathematical relationships between the × as well as T and the σ of [DMHIM][Tf2N] (1)+DMC(2). Based on the calculated results from the nonlinear curve fitting method, the x and T-dependent a is theoretically explained successfully via one function. The minimum correlation coefficient between the actual and calculated data is 0.971. The average relative errors between the measured and modeled quantities do not exceed 7.72 % in all considered cases. To my knowledge, the effects of the × and T on the change of both the σ and the p of ionic liquids are quantitatively discussed for the first time.