Abstract Surface 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.

中文翻译：

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N,N-二甲基环己胺和醇组成的二元混合物在不同温度下的表面张力

摘要 在 0.1 MPa 的整个组成范围内测量了含有 N, N-二甲基环己胺 (DMCA) 和醇、乙醇、正丙醇、异丙醇、正丁醇或异丁醇的五种二元混合物的表面张力 (γ)和不同温度范围从 (288.15 到 308.15) K。根据实验数据，计算了二元混合物的表面张力偏差 (δγ)。δγ 值对所有研究的体系都是正的，并且随着醇的烷基链长度的减少而增加。对于含有支链烷基醇的混合物，与具有直链的等效分子相比，增加是显着的。根据表面张力的温度依赖性，还估计并进一步讨论了热力学参数、表面焓（Hγ）和表面熵（Sγ）。