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Thermodynamics of mixtures with strong negative deviations from raoult’s law. XIV. density, permittivity, refractive index and viscosity data for the methanol + cyclohexylamine mixture at (293.15–303.15) K

Sanz, Luis F. ; González, Juan A. ; De La Fuente, Isasías García ; Cobos, José C.

Thermochimica acta, 2016-05, Vol.631, p.18-27 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Thermodynamics of mixtures with strong negative deviations from raoult’s law. XIV. density, permittivity, refractive index and viscosity data for the methanol + cyclohexylamine mixture at (293.15–303.15) K
  • Autor: Sanz, Luis F. ; González, Juan A. ; De La Fuente, Isasías García ; Cobos, José C.
  • Assuntos: Density ; Dielectric constant ; Kirkwood’s correlation factor ; Mathematical analysis ; Methyl alcohol ; Orientational polarization ; Permittivity ; Refractive index ; Refractivity ; Viscosity
  • É parte de: Thermochimica acta, 2016-05, Vol.631, p.18-27
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: [Display omitted] Kirkwood’s correlation factor, gk, for 1-alkanol(1)+ cyclohexylamine(2) mixtures at 298.15K: (●), methanol; (■), 1-propanol; (▲), 1-butanol; (▼), 1-heptanol; (♦), 1-decanol. •VmE, nDE, εrE, Δη for (methanol+cylohexylamine) at (293.15–303.15) K are reported.•Large negative VmE values and positive Δη values reveal the existence of strong methanol-amine interactions.•Alcohol-cyclohexylamine interactions become weaker when the size of the alcohol increases.•Positive εrE values indicate that dielectric polarization is strengthened along the mixing process.•The experimental data have been also used to calculate gk, Pm, and the corresponding excess magnitudes. Densities, kinematic viscosities, refractive indices and dielectric permittivities have been measured over the whole concentration range for the methanol+cyclohexylamine mixture at (293.15–303.15) K and 0.1MPa. Dynamic viscosities, η, were obtained from densities and kinematic viscosities. This set of experimental values has been used to determine, excess functions for volume, VmE, refractive index, nDE, and permittivity, εrE, as well as deviations of η from the linear dependence on mole fraction, Δη. Viscosity data were correlated by the following semi-empirical equations: Grunberg-Nissan, Hind, Frenkel, Katti-Chaudhri, Teja-Ric e, McAllister, and Heric. The large and negative VmE values and the positive Δη values obtained reveal the existence of strong interactions between unlike molecules in the studied mixture. Such interactions become weaker in cyclohexylamine systems when the size of the alcohol increases. Values of the molar refraction determined from the Lorentz-Lorenz equation show that dispersive interactions become more relevant for the mixtures including the longer 1-alkanols. The positive εrE values indicate that dielectric polarization is strengthened along the mixing process. It has been ascribed to the mixture compounds form multimers of larger effective dipole moment than those which come from the alcohol dissociation upon mixing. The experimental data have been also used to calculate the Kirkwood’s correlation factor, gK, the orientational polarization, Pm, and the corresponding excess magnitudes. From these calculations, it is concluded that the methanol mixture is more structured than those with longer 1-alkanols due to a strengthening of orientational polarization in comparison to that of the ideal solution.
  • Editor: Elsevier B.V
  • Idioma: Inglês;Holandês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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