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Densities (ρ), speeds of sound ( u), and isentropic compressibilities ( k S) of binary mixtures of dimethyl sulfoxide (DMSO) with water, methanol, ethanol, 1-propanol, 2-propanol, acetone and cyclohexanone have been measured over the entire composition range at 293.15 and 313.15 K. The excess molar volumes ( V E), the deviations in speed of sound ( u E) and the deviations in isentropic compressibility ( k S E) have been determined. The V E, u E and k S E values were fitted by the Redlich-Kister polynomial equation and the A k coefficients as well as the standard deviations ( d) between the calculated and experimental values have been derived. The results obtained are discussed from the viewpoint of the existence of interactions between the components of the binary mixtures. [ABSTRACT FROM AUTHOR]

Surface tensions ( σ) and densities ( ρ) of 4-methyl-2-pentanone/ethyl benzoate binary mixtures have been measured over the entire composition range at 278.15, 288.15, 298.15, and 308.15 K. Values of the excess surface tensions ( σE) and excess molar volumes ( VE) have been calculated. The σE and VE values were fitted by to the Redlich–Kister polynomial equation and the A k coefficients have been derived. The standard deviations between the calculated and the experimental excess properties have also been derived. The surface tension values have been further used to calculate the surface entropies ( SS) and surface enthalpies ( HS) per unit surface area. The lyophobicity ( β) and the surface mole fractions ( x1S) of the surfactant 4-methyl-2-pentanone have been derived using the extended Langmuir model. The obtained results are discussed from the viewpoint of the existence of specific interactions between unlike molecules in the bulk region and the surface. [ABSTRACT FROM AUTHOR]