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    Application of the UNIFAC model for prediction of surface tension and thickness of the surface layer in the binary mixtures

    Year: 2011

    Journal: Journal of Colloid and Interface Science, Volume 355, Issue 1, 1 March 2011, Pages 252-258, 20111221

    Authors: A.A. Rafati a, A. Bagheri a , A.R. Khanchi b , E. Ghasemian c , Mojgan Naja? d

    Organizations: a Department of Physical Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan 65174, Iran, b Chemistry Research Department, School of Nuclear Science Research, Nuclear Science and Technology Research Institute, Tehran, Iran, c Department of Chemistry, Faculty of Science, Ilam University, P.O. Box 69315516, Ilam, Iran, d Department of Material Engineering, Hamedan University of Technology, Hamedan, Iran

    Surface properties of binary mixtures of (alkanol with acetonitrile) have been measured by surface tension method at T = 298.15 K and atmospheric pressure. The UNIFAC method is used for calculation activity coefficients of surface and bulk phases. Also, the surface tension has been predicted based on the Suarez method. This method combines a model for the description of surface tension of liquid mixtures with a UNIFAC group contribution method for the calculation of activity coefficient. Two techniques for calculation of molar surface areas, based on Paquette areas and Rasmussen areas are tested. On comparing the computed values of surface tension by the present approaches with experimental data, satisfactory results have been observed. In addition, the relative Gibbs adsorption and the surface mole fraction have been evaluated using this model. It is possible to calculate the thickness of liquid–vapor interfaces starting from surface tension data. A novel procedure is developed to obtain the thickness of liquid–vapor interfaces as a function of composition in binary systems.