Department of Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska University, Maria Curie-Skłodowska Sq. 3, 20-031 Lublin, Poland.
Langmuir. 2010 Feb 2;26(3):1860-9. doi: 10.1021/la902618c.
In this Article, the surface behavior of mixtures of nonionic Triton X-165 (TX-165) with methanol, ethanol, and propanol at constant Triton X-165 concentration in the range from 1 x 10(-7) to 10(-3) M in aqueous solutions was investigated by surface tension measurements of their solutions in a wide range of alcohol concentrations. The obtained values of the surface tension of solutions were compared with those calculated from Szyszkowski, Connors, and Fainerman and Miller equations. On the basis of the surface tension data, the Triton X-165 and alcohol concentrations at water-air interface and their standard free energy of adsorption as well as the composition of the monolayer at this interface were determined. Taking into account this composition and activity coefficient of Triton X-165 and alcohol, the free enthalpy of their mixing was also calculated. From the measurements and calculations, it results, among other things, that unexpectedly the Fainerman and Miller equation derived for ideal mixtures of homologous surfactant can be useful for the description of changes of the solution surface tension of the investigated mixtures and that the amount of short chain alcohols at the water-air interface at their low concentration in the bulk phase is proportional to the activity coefficient.
在本文中，通过测量在一定范围内的醇浓度下的溶液的表面张力，研究了在恒定的 Triton X-165 浓度范围内（从 1 x 10(-7) 到 10(-3) M），非离子型 Triton X-165（TX-165）与甲醇、乙醇和丙醇混合物在水溶液中的表面行为。所得到的溶液表面张力值与从 Szyszkowski、Connors 和 Fainerman 以及 Miller 方程计算的值进行了比较。基于表面张力数据，确定了 Triton X-165 和醇在水-气界面上的浓度及其标准吸附自由能，以及在该界面上的单层组成。考虑到这种组成和 Triton X-165 和醇的活度系数，还计算了它们混合的自由焓。从测量和计算结果中，除其他外，出乎意料的是，为同系表面活性剂的理想混合物推导的 Fainerman 和 Miller 方程可以用于描述所研究混合物的溶液表面张力的变化，并且在低浓度的本体相中，短链醇在水-气界面上的量与活度系数成正比。
