| Ionic liquid which composed by ion of anion and cationic is liquid substances in room temperature.Ionic liquid has a wider range of liquid, good solubility which can dissolve organic, inorganic and many without steam pressure, without volatile, easy recovery to use characteristic, based on these features of ionic liquid.the researchers conducted more extensive research, this paper mainly do the following:In this paper, the density and surface tension of the ten pure ionic liquid have been studied. Molecular volume, Vm,standard entropies,S°,lattice energy, UPOT,and the surface properties of the ten ionic liquid which obtained from the experimental density values were also discussed. Reiss molecular hard-sphere model is applied to calculate the surface tension of a pure ionic liquid, then correlate the surface tension data of the 10 pure ionic liquid system to get the corresponding correlation parameters.The average deviation of surface tension is 0.53%. The calculation results are very successful.Density and surface tension have been measured over the whole composition range for [C2mim]MeSO4,[BuPy]NO3, [OcPy]NO3 with molecue solven(water, methanol, ethanol, 1-butanol) binary systems at 298.15 K and atmospheric pressure. Excess molar volumes and surface tension deviations for the binary systems have been calculated and were fitted to a Redlich-Kister equation to determine the fitting parameters and the root mean square deviations.In addition,the interface performance and interface tension between [Cnmim]BF4/hexane (n=3,4,5,6), [Cnmim]BF4/cyclohexane (n=4,6,8,10), [Cnmim]BF4/heptane (n=3,4,5,6) have been studied.
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