Department of Interfacial Phenomena, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Skłodowska University in Lublin, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland.
Department of Applied Physics, University Institute of Extremadura Sanity Research (INUBE), Extremadura University, Avda. de Elvas, s/n, 06006 Badajoz, Spain.
Molecules. 2023 Jun 25;28(13):4987. doi: 10.3390/molecules28134987.
In many industrial fields, in medicine or pharmacy, there are used multi-component mixtures of surfactants as well as more and more often mixtures containing biosurfactants. Thus, in our study the mixtures of rhamnolipid (RL), ethanol (ET) and Triton X-165 (TX165) were applied. For these mixtures the surface tension of aqueous solutions with constant concentration and composition of ET and RL as well as the variable concentration of TX165 was measured. Based on the obtained results and the literature data, thermodynamic analyses of the adsorption process of ET, RL, TX165, binary mixtures of ET + RL, ET + TX165 and RL + TX165 as well as the ternary mixtures of RL + ET + TX165 at the water-air interface were made. This analysis allows to propose a new equation for calculation of the total ethanol concentration at the water-air interface using the Guggenheim-Adam adsorption isotherm. The constants in the Langmuir and Szyszkowski equations for each component of the studied mixtures as well as the composition of the mixed monolayer at the water-air interface were also successfully analysed based on the contribution of particular surface active compounds to the water surface tension reduction as well as based on the Frumkin isotherm of adsorption.
在许多工业领域，包括医学和制药领域，都使用多组分表面活性剂混合物，并且越来越多地使用含有生物表面活性剂的混合物。因此，在我们的研究中，应用了鼠李糖脂（RL）、乙醇（ET）和 Triton X-165（TX165）的混合物。对于这些混合物，测量了具有恒定 ET 和 RL 浓度和组成以及 TX165 可变浓度的水溶液的表面张力。基于获得的结果和文献数据，对 ET、RL、TX165、ET + RL、ET + TX165 和 RL + TX165 的二元混合物以及 RL + ET + TX165 的三元混合物在水-气界面上的吸附过程进行了热力学分析。该分析允许使用 Guggenheim-Adam 吸附等温线提出一种新的计算水-气界面总乙醇浓度的方程。还成功地基于特定表面活性剂化合物对水表面张力降低的贡献以及基于吸附的 Frumkin 等温线，分析了研究混合物中每个组分的 Langmuir 和 Szyszkowski 方程的常数以及水-气界面处混合单层的组成。
