含非对称Gemini离子液体二元混合体系的体积和黏度性质

在温度分别为293.15、303.15、313.15、323.15和333.15 K及大气压下，系统测定了非对称Gemini离子液体，1-(3-(三甲基铵)丙-1-基)-3-甲基咪唑双氰胺盐([N₁₁₁C₃MIM][N(CN)₂]₂)，分别与乙腈(MeCN)、甲醇(MeOH)、乙醇(EtOH)所组成的二元混合物的密度和黏度。由密度和黏度值分别计算了二元混合物的超额摩尔体积(V_{\mathrm{m}}^{\mathrm{E}})和超额黏度(Δη)。V_{\mathrm{m}}^{\mathrm{E}}和Δη随组成的变化关系由Redlich-Kister方程进行了回归，得到方程参数。结果表明，V_{\mathrm{m}}^{\mathrm{E}}和Δη值与理想溶液间为负偏差，且存在最小值，说明二元体系中[N₁₁₁C₃MIM][N(CN)₂]₂和溶剂分子间相互作用力更强，同时与所研究分子的大小和形状的差异有关。同时，V_{\mathrm{m}}^{\mathrm{E}}和Δη随温度的变化关系表明，温度对研究混合物中的分子间相互作用有很大影响。

Volumetric and viscosity properties of binary mixtures containing asymmetrical Gemini ionic liquid

Densities and dynamic viscosities of binary solutions containing asymmetrical Gemini ionic liquid (GIL), 1-(3-(trimethylammonio)prop-1-yl)-3-methylimidazolium bis(dicyanamide) ([N₁₁₁C₃MIM][N(CN)₂]₂) with acetonitrile (MeCN), methanol (MeOH) or ethanol (EtOH) over the entire mole fraction range have been measured from 293.15 K to 333.15 K under atmospheric pressure. Excess molar volumes (V_{\mathrm{m}}^{\mathrm{E}}) and excess viscosities (Δη) of the solutions were calculated based on the experimental density andviscosityvalues of pure [N₁₁₁C₃MIM][N(CN)₂]₂, molecular solvents, and their binary mixtures. The values of V_{\mathrm{m}}^{\mathrm{E}} and Δη were fitted by using the Redlich–Kister equations and the optimal ?tting parameters were obtained. The results indicate thatthe values of V_{\mathrm{m}}^{\mathrm{E}} and Δη reveal negative deviations from ideal solutions. There exists a minimum excess values. Negative values of V_{\mathrm{m}}^{\mathrm{E}} and Δη for all the binary mixtures indicate, compared to pure [N₁₁₁C₃MIM][N(CN)₂]₂ and molecular solvents, stronger interactions between [N₁₁₁C₃MIM][N(CN)₂]₂ and MeCN, MeOH or EtOH. These negative values are also related to the difference in size and shape of the molecules studied. Moreover, the variation of V_{\mathrm{m}}^{\mathrm{E}} and Δη on temperature suggests that temperature has an enormous in?uence on the intermolecular interactions between [N₁₁₁C₃MIM][N(CN)₂]₂ and molecular solvents.