Pilar Brocos | University of Santiago de Compostela (original) (raw)

Papers by Pilar Brocos

Physical Chemistry Chemical Physics, 2003

Title: Refractive indices, molar volumes and molar refractions of binary liquid mixtures: concept... more Title: Refractive indices, molar volumes and molar refractions of binary liquid mixtures: concepts and correlationsElectronic supplementary information ... cp/b2/b208765k/Presented in part at the 17th IUPAC Conference on Chemical Thermodynamics, July 2002, Rostok, Germany. ...

Journal of Chemical Thermodynamics - J CHEM THERMODYN, 1999

The refractive indices n and surface tensions σ of liquid binary mixtures {xc-(CH2)4O + (1 − x)C... more The refractive indices n and surface tensions σ of liquid binary mixtures {xc-(CH2)4O + (1 − x)CH3(CH2)mCH3,m = (4 to 8)} were measured at T = 298.15 K over the whole concentration range. The densities ρ of {xc-(CH2)4O + (1 − x)CH3(CH2)8CH3} were also measured at this temperature. The data are discussed in terms of molecular interactions and the chain length of the n -alkane. The Lorentz–Lorenz, Dale–Gladstone, Eykman, Oster, Arago–Biot, and Newton equations were used to predict the excess molar volumes from the refractometric measurements, as well as a modified Eykman equation with a parameter obtained for each binary system from data for dn / dT , dρ / dT , and ρ for the pure components. The most accurate predictions were those of the Oster and parametrized Eykman equations. Surface tensions predicted from measured densities using the Sugden equation and the assumption of mole-wise additivity for parachor were more accurate (between 2 per cent and 7 per cent) than predictions based on refractive index obtained by combining the Sugden equation and the definition of molar refraction R and adopting the additional assumption of mole-wise additivity forR .

Journal of Chemical & Engineering Data, 1998

Excess molar volumes for {1,4-dioxane or 1,3-dioxolane + cyclohexane} and excess molar enthalpies... more Excess molar volumes for {1,4-dioxane or 1,3-dioxolane + cyclohexane} and excess molar enthalpies and isobaric excess molar heat capacities for the binary mixtures {tetrahydrofuran, tetrahydropyran, 1,4dioxane, or 1,3-dioxolane + cyclohexane or toluene} at the temperature 298.15 K have been determined as a function of mole fraction. The magnitude of these experimental quantities is discussed in terms of the nature and type of intermolecular interactions in binary mixtures. When available, the results have been compared with literature values.

Journal of Chemical & Engineering Data, 2003

Densities F, refractive indices n, and volumetric heat capacities C p /V have been measured at 29... more Densities F, refractive indices n, and volumetric heat capacities C p /V have been measured at 298.15 K over the whole concentration range for the binary mixtures {tetrahydropyran + 2-pentanone, + 2-heptanone, or + cyclopentanone}. From the experimental data, excess molar volumes V E , excess molar refractions R E , and excess molar isobaric heat capacities C p E were calculated. Deviations of refractive index from ideality were determined by using a deviation function defined on a volume fraction basis, ∆n φ . Excess molar enthalpies H E have been measured at the same temperature for the systems {tetrahydropyran + 2-pentanone, + 2-heptanone, + cyclopentanone, or + cyclohexanone}. The discussion of these quantities entails a comparison with the results obtained in part 1 of this series for a homologous set of systems containing tetrahydrofuran.

Physical Chemistry Chemical Physics, 2003

Title: Refractive indices, molar volumes and molar refractions of binary liquid mixtures: concept... more Title: Refractive indices, molar volumes and molar refractions of binary liquid mixtures: concepts and correlationsElectronic supplementary information ... cp/b2/b208765k/Presented in part at the 17th IUPAC Conference on Chemical Thermodynamics, July 2002, Rostok, Germany. ...

Journal of Chemical Thermodynamics - J CHEM THERMODYN, 1999

The refractive indices n and surface tensions σ of liquid binary mixtures {xc-(CH2)4O + (1 − x)C... more The refractive indices n and surface tensions σ of liquid binary mixtures {xc-(CH2)4O + (1 − x)CH3(CH2)mCH3,m = (4 to 8)} were measured at T = 298.15 K over the whole concentration range. The densities ρ of {xc-(CH2)4O + (1 − x)CH3(CH2)8CH3} were also measured at this temperature. The data are discussed in terms of molecular interactions and the chain length of the n -alkane. The Lorentz–Lorenz, Dale–Gladstone, Eykman, Oster, Arago–Biot, and Newton equations were used to predict the excess molar volumes from the refractometric measurements, as well as a modified Eykman equation with a parameter obtained for each binary system from data for dn / dT , dρ / dT , and ρ for the pure components. The most accurate predictions were those of the Oster and parametrized Eykman equations. Surface tensions predicted from measured densities using the Sugden equation and the assumption of mole-wise additivity for parachor were more accurate (between 2 per cent and 7 per cent) than predictions based on refractive index obtained by combining the Sugden equation and the definition of molar refraction R and adopting the additional assumption of mole-wise additivity forR .

Journal of Chemical & Engineering Data, 1998

Excess molar volumes for {1,4-dioxane or 1,3-dioxolane + cyclohexane} and excess molar enthalpies... more Excess molar volumes for {1,4-dioxane or 1,3-dioxolane + cyclohexane} and excess molar enthalpies and isobaric excess molar heat capacities for the binary mixtures {tetrahydrofuran, tetrahydropyran, 1,4dioxane, or 1,3-dioxolane + cyclohexane or toluene} at the temperature 298.15 K have been determined as a function of mole fraction. The magnitude of these experimental quantities is discussed in terms of the nature and type of intermolecular interactions in binary mixtures. When available, the results have been compared with literature values.

Journal of Chemical & Engineering Data, 2003

Densities F, refractive indices n, and volumetric heat capacities C p /V have been measured at 29... more Densities F, refractive indices n, and volumetric heat capacities C p /V have been measured at 298.15 K over the whole concentration range for the binary mixtures {tetrahydropyran + 2-pentanone, + 2-heptanone, or + cyclopentanone}. From the experimental data, excess molar volumes V E , excess molar refractions R E , and excess molar isobaric heat capacities C p E were calculated. Deviations of refractive index from ideality were determined by using a deviation function defined on a volume fraction basis, ∆n φ . Excess molar enthalpies H E have been measured at the same temperature for the systems {tetrahydropyran + 2-pentanone, + 2-heptanone, + cyclopentanone, or + cyclohexanone}. The discussion of these quantities entails a comparison with the results obtained in part 1 of this series for a homologous set of systems containing tetrahydrofuran.