In this work, an alternative physicochemical procedure is presented to characterize the liquid-vapor interface of binary liquid mixtures containing non-ionic surfactants, using the Gibbs adsorption isotherm, the solute activity, and the surface partial molar areas. This model allowed to calculate the moles of solute and solvent present in equilibrium for both bulk and surface phase. The excess surface concentration, relative surface concentration, and molar fraction of both components was also calculated. The results reflected that the excess surface concentration of the solute was not proportional to the adsorption of the solute with the increase in its concentration in the bulky phase. This gives evidence that the dilute solutions were able to saturate the surface layer at an early stage and after it, for the entire concentration range where it remains approximately constant, which showed the existence of a compact molecular arrangement.

在这项工作中，使用吉布斯吸附等温线、溶质活性和表面偏摩尔面积，提出了一种替代物理化学程序来表征含有非离子表面活性剂的二元液体混合物的液气界面。该模型允许计算体相和表面相平衡时存在的溶质和溶剂的摩尔数。还计算了两种组分的过量表面浓度、相对表面浓度和摩尔分数。结果表明，随着溶质在大相中浓度的增加，溶质的过量表面浓度与溶质的吸附不成正比。这提供了稀溶液能够在表层的早期和之后使表层饱和的证据，