Kirkwood-Buff integrals in aqueous solutions of 3-methylpyridine
| Autor: | L. Cser, László Almásy, G. Jancsó |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Heavy water
Aqueous solution Scattering 3-Methylpyridine Thermodynamics Neutron scattering Condensed Matter Physics Mole fraction Small-angle neutron scattering Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Gibbs free energy chemistry.chemical_compound symbols.namesake chemistry Materials Chemistry symbols Physical and Theoretical Chemistry Spectroscopy |
| Zdroj: | Journal of Molecular Liquids. 101:89-98 |
| ISSN: | 0167-7322 |
| DOI: | 10.1016/s0167-7322(02)00084-3 |
| Popis: | Small-angle neutron scattering measurements were performed on 3-methylpyridine (3MP) — heavy water mixtures in the mole fraction range of 0.005–0.25 at 25 °C. The obtained zero-angle scattering intensities were used together with thermodynamic data to obtain Kirkwood-Buff integrals. Calculations for 3MP — water mixtures using thermodynamic data available in the literature indicated the inaccuracy of the excess Gibbs free energy data. The extraordinary high values of the Kirkwood-Buff integrals for the 3MP —heavy water system together with thermodynamic arguments show that first indications of the liquid-liquid phase separation can be seen already at 25 °C, which is much below the lower critical solution temperature. The analysis of the excess (or deficit) number of molecules surrounding a central one allowed us to conclude that strong clustering occurs in the mixture. |
| Databáze: | OpenAIRE |
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