Zhida Zuo, Bei Cao, Linghong Lu, Xiaohua Lu, Xiaoyan Ji
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引用次数: 0
Abstract
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.