Experimental study on the surface tension density viscosity and conductivity of ionic liquid 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide.

Independent synthesis of ionic liquid [emim][Tf2N], and the surface tension, density, viscosity and conductivity are measured in the temperature range of 298.15K~338.15K, 0.1MPa, and under the same condition the literature data were compared. The results of the study show that, surface tension of the ionic liquid decreases with the increases of the length of the cation substituted carbon chain and the anion size. Surface tension and density of ionic liquid [emim][Tf2N] almost linearly change with the temperature. At the same time, the least square method is used to process the experimental data, and the regression equation of surface tension and density with temperature is obtained，and the viscosity decreases with increasing temperature, the conductivity increases with increasing temperature. Determination of these data to fill the ionic liquid [emim][Tf2N] relevant physical parameters blank, and provide a reference for its application.

本研究独立合成了离子液体（ionic liquid）[emim][Tf2N]，并在298.15K~338.15K、0.1MPa的实验条件下，测定了其表面张力、密度、黏度及电导率；同时将实验数据与同期文献报道的同类数据进行了对比。研究结果表明，该离子液体的表面张力随阳离子取代碳链长度的增加以及阴离子尺寸的增大而降低。[emim][Tf2N]的表面张力与密度随温度几乎呈线性变化。与此同时，本研究采用最小二乘法对实验数据进行拟合，得到了其表面张力、密度与温度的回归方程；实验还发现，黏度随温度升高而降低，电导率则随温度升高而升高。上述物理参数的测定填补了[emim][Tf2N]相关物理参数的研究空白，可为其后续应用提供参考依据。