RT info:eu-repo/semantics/article
T1 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
A1 Hevia de los Mozos, Luis Fernando
A1 González López, Juan Antonio Mariano
A1 Cobos Huerga, Ana
A1 García de la Fuente, Isaías Laudelino
A1 Alonso-Tristán, Cristina
K1 Termodinámica
K1 2213 Termodinámica
AB 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.
PB Elsevier
SN 0378-3812
YR 2018
FD 2018
LK https://uvadoc.uva.es/handle/10324/69153
UL https://uvadoc.uva.es/handle/10324/69153
LA spa
NO Fluid Phase Equilibria, 2018, 468, 18-28
DS UVaDOC
RD 22-nov-2024