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Título
Thermodynamics of mixtures with strongly negative deviations from Raoult's law. XV. Permittivities and refractive indices for 1-alkanol + n -hexylamine systems at (293.15–303.15) K. Application of the Kirkwood-Fröhlich model
Autor
Año del Documento
2018
Editorial
Elsevier
Documento Fuente
Fluid Phase Equilibria, 2018, 468, 18-28
Resumo
Relative permittivities at 1 MHz, ε_r, and refractive indices at the sodium D-line, n_D, are reported at 0.1 MPa and at (293.15-303.15) K for the binary systems 1-alkanol + n-hexylamine (HxA). Also, their corresponding excess functions are calculated and correlated. Positive values of the excess permittivities, ε_r^E, are encountered for the methanol system, whereas the remaining mixtures show negative values. This reveals that interactions between unlike molecules contribute positively to ε_r^E. This contribution is dominant for the methanol mixture, while those arising from the breaking of interactions between like molecules are prevalent for the remaining mixtures. At ϕ_1(volume fraction) = 0.5, ε_r^E changes in the order: methanol > 1-propanol > 1-butanol > 1-pentanol < 1-heptanol. Similar variation with the chain length of the 1-alkanol is observed for mixtures such as 1-alkanol + heptane, or + cyclohexylamine, and can be explained in terms of the lower and weaker self-association of longer 1-alkanols. The effect of the replacement of HxA by cyclohexylamine, or by aniline, is also shown. Calculations on molar refractions indicate that dispersive interactions in the systems under study increase with the length of the 1-alkanol. The mixtures are studied by means of the application of the Kirkwood-Fröhlich model, and the Kirkwood correlation factors, including the corresponding excess values, are reported.
Materias (normalizadas)
Termodinámica
Materias Unesco
2213 Termodinámica
ISSN
0378-3812
Revisión por pares
SI
Patrocinador
Junta de Castilla y León Regional Grant BU034U16
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU14/04104
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU15/05456
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU14/04104
Ministerio de Educación, Cultura y Deporte (MECD): Grant FPU15/05456
Version del Editor
Idioma
spa
Tipo de versión
info:eu-repo/semantics/acceptedVersion
Derechos
openAccess
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