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      Dielectric properties of liquid systems: study of interactions in the systems carbon tetrachloride with benzene, toluene, and p-xylene

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          Intermolecular associations in liquid systems of non-polar and slightly polar compounds were studied through excess molar volumes ( V M E ), and excess dielectric properties ( ε E and n D 2 E ) for mixtures of carbon tetrachloride ( C C l 4 ) with benzene ( C 6 H 6 ), toluene ( C 6 H 5 C H 3 ), and p-xylene ( p ( C H 3 ) 2 C 6 H 4 ). These excess properties were calculated from measurements of density ( ρ ), static permittivity ( ε ), and refractive index ( n D ) over the whole range of concentrations, at 298.15 K. The values of the excess dielectric properties for these mixtures were fitted in two different ways, one through least squares using the Redlich–Kister equation and the other using a model developed to explain deviations from ideality. The first fit was found to be descriptive while the second gave the equilibrium constant values for the interaction products actually formed in the mixtures and the respective electronic polarizabilities and dipole moments, indicating the existence of interaction products.

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          The permittivity of thermodynamically ideal liquid mixtures and the excess relative permittivity of binary dielectrics.

          The ideal relative permittivity of liquid mixtures is demonstrated to be a volume-fraction-weighted average of the pure-component relative permittivities. This generalised-thermodynamics result is used to define the molar electric dipole, permittivity, dielectric polarization and electric susceptibility of thermodynamically ideal liquid mixtures and the corresponding excess properties. A hyperbolic approach is developed to the analysis of averaging formulae that are frequently used to predict the effective permittivity of composite materials. Some of these formulae are shown to be segments of rectangular hyperbolae with fixed asymptote values, whereas others can be understood in terms of rectangular hyperbolae with composition-dependent asymptote values. Relative permittivities of binary mixtures between tetraglyme and hexane, cyclohexane or benzene covering the complete composition range are reported at various temperatures. These data are used to outline a novel method for analysing the excess relative permittivity of liquid mixtures.
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            Heats of Mixing in the System Carbon Tetrachloride–Cyclohexane–Benzene

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              Trends in dielectrics research: an international review from 1980 to 2004


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                ScienceOpen Research
                19 December 2014
                23 July 2015
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                [1 ]Facultad de Ciencias Exactas y Naturales, Facultad de Ingeniería y Facultad de Tecnología Informática, Universidad de Belgrano-Villanueva 1324, C. P. 1426-Buenos Aires, Argentina
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                [* ]Corresponding author e-mail address: adrian.buep@ 123456comunidad.ub.edu.ar
                © 2015 Adrián H. Buep.

                This work has been published open access under Creative Commons Attribution License CC BY 4.0 , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conditions, terms of use and publishing policy can be found at www.scienceopen.com .

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                Figures: 10, Tables: 6, References: 21, Pages: 9
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