Szymczyk Katarzyna, Jańczuk Bronisław
Department of Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland.
Langmuir. 2007 Apr 24;23(9):4972-81. doi: 10.1021/la063554+. Epub 2007 Mar 31.
The behavior of mixed nonionic/nonionic surfactant solutions, that is, p-(1,1,3,3-tetramethylbutyl)phenoxy poly(ethylene glycol)s Triton X-100 (TX100) and Triton X-165 (TX165) have been studied by surface tension and density measurements. The obtained results of the surface tension measurements were compared with those calculated from the relations derived by Joos, Miller, and co-workers. From the comparison, it appeared that by using these two approaches the adsorption behavior of TX100 and TX165 mixtures at different mole fractions can be predicted. The negative deviation from the linear relationship between the surface tension and composition of TX100 and TX165 mixtures in the concentration range corresponding to that of the saturated monolayer at the interface, the values of the parameters of molecular interaction, the activity coefficients, as well as the excess Gibbs energy of mixed monolayer formation calculated on the basis of Rosen and Motomura approaches proved that there is synergism in the reduction of the surface tension of aqueous solutions of TX100 and TX165 mixture when saturation of the monolayer is achieved. The negative parameters of intermolecular interaction in the mixed micelle and calculations based on MT theory of Blankschtein indicate that there is also synergism in the micelle formation for TX100 and TX165 mixture. It was also found that the values of the standard Gibbs energy of adsorption and micellization for the mixture of these two surfactants, which confirm the synergetic effect, can be predicted on the basis of the proposed equations, which include the values of the mole fraction of surfactant and excess Gibbs energy TX100 and TX165 in the monolayer and micelle.
通过表面张力和密度测量研究了混合非离子/非离子表面活性剂溶液的行为，即对（1,1,3,3 - 四甲基丁基）苯氧基聚（乙二醇）类的吐温X - 100（TX100）和吐温X - 165（TX165）。将表面张力测量得到的结果与根据Joos、Miller及同事推导的关系式计算得出的结果进行了比较。通过比较发现，利用这两种方法可以预测TX100和TX165混合物在不同摩尔分数下的吸附行为。在与界面处饱和单分子层浓度范围相对应的TX100和TX165混合物表面张力与组成之间的线性关系出现负偏差、分子相互作用参数值、活度系数以及基于Rosen和Motomura方法计算的混合单分子层形成的过量吉布斯自由能，都证明当单分子层达到饱和时，TX100和TX165混合物水溶液的表面张力降低存在协同作用。混合胶束中分子间相互作用的负参数以及基于Blankschtein的MT理论的计算表明，TX100和TX165混合物在胶束形成方面也存在协同作用。还发现，基于所提出的方程可以预测这两种表面活性剂混合物的吸附和胶束化标准吉布斯自由能的值，这些方程包括表面活性剂的摩尔分数值以及单分子层和胶束中TX100和TX165的过量吉布斯自由能，这证实了协同效应。
