Jornal de termodinâmica e catálise
Acesso livre

Abstrato

Dielectric and thermodynamic study of binary systems of alcohols in H-bond acceptor media

Shahrbanoo Ramezani

Relative permittivity, refractive index, and density data were measured for binary mixtures containing alcohols and ketones in the mole fraction range of (0 ≤ ≤ 1) at T = (298.2 and 308.2) K and P = 101.3 kPa. Comparative study was performed on the eighteen polar-polar binary systems of the {1-alkanols (ethanol, 1-butanol, 1-hexanol, 1-octanol and 1-decanol) + cyclic ketones (cyclopentanone, and cyclohexanone)}, {cyclohexanol + cyclic ketones (cyclopentanone and cyclohexanone)}, and {heavy alcohols (1-hexanol, 1-octanol, and 2-ethyl-1-hexanol) + linear ketones (methyl ethyl ketone, diethyl ketone)}. The analyses were performed by using Kumbharkhane, Winkelmann-Quitzsch, and Reis-Iglesias theories, leading to optical, electrical, and thermodynamic excess quantities. The effective and corrective Kirkwood¬ correlation factors are also calculated to investigate the formations of H-bonded structure in the mixtures. The inter molecular communications were explored through different overabundance parameters, namely, excess permittivity, abundance refractive file, abundance molar volumes, overabundance Helmholtz energies and overabundance Kirkwood connection factors. The excess properties of different physical quantities are also confirming the formation of hydrogen-bonded structure in these mixtures.