Surface tension of binary mixtures composed of N, N-dimethylcyclohexylamine and alcohols at different temperatures

Publication date: Available online 31 December 2019Source: The Journal of Chemical ThermodynamicsAuthor(s): Dan Zhao, Yun Zhuang, Chunshan Fan, Fang Yang, Yuhuan Chen, Xihui ZhangAbstractSurface tension (γ) for five binary mixtures containing N, N-dimethylcyclohexylamine (DMCA) and alcohol, ethanol, n-propanol, iso-propanol, n-butanol or iso-butanol were measured over the whole range of composition at 0.1 MPa and different temperatures ranging from (288.15 to 308.15) K. From the experimental data, the surface tension deviations (δγ) for the binary mixtures were calculated. The δγ values are positive for all the studied systems and increase with the decreasing of alky chain length of alcohol. For the mixture containing the branched alkyl alcohol, the increase is significant compared with the equivalent molecules with straight chains. According to temperature dependence of surface tension, the thermodynamic parameters, surface enthalpy (Hγ) and surface entropy (Sγ) were also estimated and further discussed.

Source: The Journal of Chemical Thermodynamics - January 2, 2020 Category: Chemistry Source Type: research