Influences of composition and temperature on the behaviors of a binary mixture containing methanol and 1-ethylimidazole
| Autor: | Chang Liu, Jing Yang, Luohong Zhang, Yanping Du, Zhou Xinzi, Shi Haojun, Lan Yijun, Haiyun Hou, Junru Wang |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Enthalpy Thermodynamics 02 engineering and technology 010402 general chemistry 01 natural sciences symbols.namesake chemistry.chemical_compound Viscosity Materials Chemistry Binary system Physical and Theoretical Chemistry Spectroscopy Atmospheric pressure 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Gibbs free energy chemistry symbols Isobaric process Methanol van der Waals force 0210 nano-technology |
| Zdroj: | Journal of Molecular Liquids. 330:115503 |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/j.molliq.2021.115503 |
| Popis: | As a further investigation on the binary mixtures containing 1-alkylimidazole, over the whole composition range and at atmospheric pressure, density, ρ, sound velocity, u, of binary system of x 1-ethylimidazole (abbreviated as 1-Eim) + (1-x) methanol, were measured at temperatures (293.15–328.15) K; refractive index, nD, and viscosity, η, of them were determined at temperatures (293.15–318.15) K; 1H NMR, δH, is measured at 288.15 K; isobaric thermal expansivity, αp, isentropic compressibility, κS, excess and deviation properties were calculated. The excess enthalpy and Gibbs free energy were predicted by COSMO-RS model. All the properties indicate that the real mixing process is a spontaneous enthalpy-driving process with liquid structure more ordered, and a lower temperature more benefits the process. There are stronger attractive interactions in the mixture than in pure liquids. The H-bonded interactions are the main attractive interactions in the mixture, followed by the electrostatic/misfit interaction and the Van der Waals force. A H-bonded network with a ration of methanol:1-Eim = 1:1 appears in the mixture, and reaches its maximum amount at x about 0.4; via the N···HO, the rearrangement of electron densities occurs where protons of 1-Eim and hydroxyl all show electron-donating abilities while methyl protons of methanol show electron-withdrawing ability. |
| Databáze: | OpenAIRE |
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