Rafati Amir Abbas, Ghasemian Ensieh
Faculty of Chemistry, Bu-Ali Sina University, P.O. Box 65174, Hamadan, Iran.
J Colloid Interface Sci. 2008 Dec 15;328(2):385-90. doi: 10.1016/j.jcis.2008.09.014. Epub 2008 Oct 11.
The Butler equation is employed to describe quantitatively the nature, properties, and compositions of surface layers in binary liquid mixtures. Bulk mole fraction, surface molar area, and surface tension of pure components are necessary inputs for this equation. In addition, the UNIFAC group contribution method is applied to account for the nonideality of the bulk liquid as well as that of the surface layer. The average relative error obtained from the comparison of experimental and calculated surface tension values for 12 binary systems is less than 1%. Therefore, the model has good accuracy in comparison with other predictive equations. In addition to finding more information about the surface structure of binary mixtures, surface mole fraction was calculated using relative Gibbs adsorption values and an extended Langmuir model (EL). The obtained results show a good consistency between two models employed, i.e., the Gibbs adsorption model and EL model, based on the UNIFAC method.
巴特勒方程用于定量描述二元液体混合物表面层的性质、特性和组成。该方程的必要输入参数包括纯组分的体相摩尔分数、表面摩尔面积和表面张力。此外，采用UNIFAC基团贡献法来考虑体相液体和表面层的非理想性。通过比较12个二元体系的实验表面张力值和计算表面张力值得到的平均相对误差小于1%。因此，与其他预测方程相比，该模型具有良好的准确性。除了获取有关二元混合物表面结构的更多信息外，还使用相对吉布斯吸附值和扩展朗缪尔模型（EL）计算了表面摩尔分数。所得结果表明，基于UNIFAC方法的吉布斯吸附模型和EL模型这两种模型之间具有良好的一致性。
