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The paper presents the properties of mixtures of benzyl alcohol and ethylene glycol at the liquid/air interface. The properties were studied by surface tension measurements carried out at as a function of the mole fraction of benzyl alcohol at temperatures between (20 and 50)°C. It was shown that at constant temperature by the addition of benzyl alcohol the surface tension decreases and at constant composition by the increasing of temperature the surface tension decreases linearly. The surface entropies and enthalpies were calculated from experimental data. The surface composition of the mixture at a low concentration of benzyl alcohol was obtained from the extended Langmuir model. Values of the excess surface tension for mixtures were calculated and show a negative deviation from ideality.

Surface tension, σ(t), for binary mixtures of ethylene glycol + 2-methylcyclohexanol, +3-methylcyclohexanol, and +4-methylcyclohexanol was measured over the whole composition range. Measurements were made under atmospheric pressure in the temperature range between 293.15 K and 323.15 K. The experimental values were correlated with mol fraction and temperature and also have been used to calculate the excess surface tensions. The thermodynamics properties of the mixture, the surface entropy, and surface enthalpy have been calculated.

Surface tensions of dilute solutions of cyclohexane, hexane, heptane, and nonane in benzyl alcohol were measured at various temperatures. Surface mole fractions were obtained from an extended Langmuir model. The results show that all of alkanes are surface active in benzyl alcohol and that their surface mole fractions are higher than their bulk mole fractions. The lyophobicity of solutes decreases with increasing temperature.

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