A volumetric and viscosity study for the mixtures of 1-n-butyl-3-methylimidazolium tetrafluoroborate ionic liquid with acetonitrile, dichloromethane, 2-butanone and N,N-dimethylformamide
A volumetric and viscosity study for the mixtures of 1-n-butyl-3-methylimidazolium tetrafluoroborate ionic liquid with acetonitrile, dichloromethane, 2-butanone and N,N-dimethylformamide
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DOI：
10.1039/b303735e
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发表时间：
2003-01-01
期刊：
影响因子：
9.8
通讯作者：
Zhuo, K
中科院分区：
文献类型：
--
作者：
Wang, JJ;Tian, Y;Zhuo, K
在298.15 K下测定了1-正丁基-3-甲基咪唑四氟硼酸盐离子液体与乙腈、二氯甲烷、2-丁酮和N，N-二甲基甲酰胺的混合物的密度和粘度，发现混合物的粘度可用指数方程描述。它们的密度是离子液体在混合物中的质量分数的线性函数。只要已知纯组分的性质，这些物理性质就可以作为离子液体浓度的函数来预测。计算了超额摩尔体积V-m(E)和超额对数粘度(Ln ETA)(E)，并用Redlich-Kister多项式进行了拟合。结果表明，V-m(E)为负值，而(Ln ETA)(E)为正值。令人惊讶的是，在离子液体的摩尔分数大致相同时，观察到V-m(E)的最小值和(Ln ETA)(E)的最大值，x接近0.3。根据离子液体的阳离子与有机溶质之间的离子-偶极相互作用对结果进行了讨论。
The densities and viscosities for mixtures of 1-n-butyl-3-methylimidazolium tetrafluoroborate ionic liquid with acetonitrile, dichloromethane, 2-butanone and N,N-dimethylformamide have been determined at 298.15 K. From these measurements, it was found that viscosities of the mixtures can generally be described by an exponential equation. Their densities are linear functions of the mass fraction of the ionic liquid in the mixtures. These physical properties can be predicted as a function of the concentration of ionic liquid provided that the properties for pure components are known. The excess molar volume V-m(E) and the excess logarithm viscosities (ln eta)(E) were calculated and fitted to the Redlich-Kister polynomials. It is shown that the values of V-m(E) are negative but those of (ln eta)(E) are positive. Surprisingly, the minimum in V-m(E) and the maximum in (ln eta)(E) are observed at about the same mole fraction of the ionic liquid, xapproximate to0.3. The results are discussed in terms of the ion-dipole interactions between the cations of the ionic liquid and the organic solutes.