Zhida Zuo, Bei Cao, Linghong Lu, Xiaohua Lu, Xiaoyan Ji
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引用次数: 0
摘要
为了研究阴离子大小、溶剂含量和温度对其物理性质的影响,在这项工作中,测量了三种二元混合物的密度和粘度,其中包括由阳离子 1-己基-3-甲基咪唑(即 [C6mim]+)和卤化物阴离子(即 Cl-、Br- 和 I-)以及甲醇(MeOH)组成的离子液体(ILs)、在 298.15 和 308.15 K 的温度下,测量了整个浓度范围内 1-己基-3-甲基咪唑鎓阳离子(即 [C6mim]+)和卤化物阴离子(即 Cl-、Br- 和 I-)以及甲醇(MeOH)的含量,并测定了混合焓。过剩体积的结果表明,分子间的相互作用和堆积效应共同导致了混合物的非理想行为,其中堆积效应可能主导了负过剩体积。粘度偏差和混合焓表明,MeOH 分子有意在富含 IL 的区域与 IL 离子(IL 阳离子和 IL 阴离子)配位,与([C6mim]Br + MeOH)和([C6mim]I + MeOH)混合物相比,[C6mim]Cl 和 MeOH 之间的相互作用更强。此外,非随机双液模型和吉布斯-赫尔姆霍兹方程相结合,可靠地描述了所研究混合物的混合焓。
Thermodynamic Study of Ionic Liquids 1-Hexyl-3-methylimidazolium Halide with Methanol Mixtures
To investigate the effects of anion size, solvent content, and temperature on their physical properties, in this work, densities and viscosities of three binary mixtures, including ionic liquids (ILs) composed of the cation 1-hexyl-3-methylimidazolium (i.e., [C6mim]+) and the halide anions (i.e., Cl–, Br–, and I–), along with methanol (MeOH), were measured across the entire concentration range at temperatures from 288.15 to 323.15 K, and enthalpies of mixing were determined at temperatures of 298.15 and 308.15 K. Excess volumes and viscosity deviations were calculated to study the nonideal behavior of the mixtures. The results of excess volumes suggest that a combination of intermolecular interactions and packing effects contributes to their nonideal behaviors, with packing effects likely dominating the negative excess volume. Viscosity deviations and enthalpies of mixing indicate that MeOH molecules intend to coordinate with IL ions (IL cations and IL anions) in the IL-rich region, with stronger interactions observed between [C6mim]Cl and MeOH compared to ([C6mim]Br + MeOH) and ([C6mim]I + MeOH) mixtures. Additionally, the nonrandom two-liquid model and the Gibbs–Helmholtz equation were combined to describe the enthalpies of mixing for the studied mixtures reliably.
期刊介绍:
The Journal of Chemical & Engineering Data is a monthly journal devoted to the publication of data obtained from both experiment and computation, which are viewed as complementary. It is the only American Chemical Society journal primarily concerned with articles containing data on the phase behavior and the physical, thermodynamic, and transport properties of well-defined materials, including complex mixtures of known compositions. While environmental and biological samples are of interest, their compositions must be known and reproducible. As a result, adsorption on natural product materials does not generally fit within the scope of Journal of Chemical & Engineering Data.