Surface thermodynamic behaviour of binary liquid mixtures of benzene+1,1,2,2-tetrachloroethane at different temperatures: an experimental and theoretical study

Surface tensions, sigma, of pure benzene, 1,1,2,2-tetrachloroethane and those of their binary liquid mixtures over the whole composition range at 298.15, 308.15 and 313.15 K have been measured. The experimental sigma data have been correlated against temperature and concentration using standard relations. The measured values have been used to calculate various useful thermodynamic parameters, viz., deviation in surface tension, Delta sigma, surface entropy, S-S, and surface enthalpy, H-S. The sign and magnitude of these parameters were discussed in terms of molecular interactions between the component molecules of the liquid mixtures. A number of empirical, semi-empirical and statistical models and theories such as Aurebach, Sanchez, Goldsach - Sarvas volume fraction statistics, Brock and Bird relation, Sudgen's relation and Flory - Patterson - Rastogi model have been used to compute theoretically the values of surface tension. Moreover, deviation in surface tension, Delta sigma has also been calculated using HSIS and HSEG theories and found to be qualitatively correct.