Miller R, Aksenenko E V, Kovalchuk V I, Fainerman V B
MPI Colloids and Interfaces, Potsdam, Germany.
Institute of Colloid Chemistry and Chemistry of Water, Kyiv (Kiev), Ukraine.
Phys Chem Chem Phys. 2017 Jan 18;19(3):2193-2200. doi: 10.1039/c6cp07705f.
The dynamic and equilibrium surface tension for drops of aqueous CEO solutions at the interface to pure air or pentane, hexane, heptane and toluene saturated air, and the dynamic surface tension of pure water at these interfaces are presented. Two theoretical models were employed: both assuming a diffusion controlled adsorption of the surfactant, and either a diffusion or kinetic barrier governed adsorption of the alkanes. The experimental results are best described by the model which implies a diffusion control for the CEO molecules and the existence of a kinetic barrier for the alkane molecules. The desorption of alkanes from the surface layer after equilibration and their subsequent removal from the measuring cell was studied as well. The desorption process was shown to be slow for heptane and hexane. However, for the pentane vapor the desorption is quite rapid, and after the desorption commences the surface tension becomes equal to that at the interface with pure air.
本文给出了CEO水溶液液滴在与纯空气或戊烷、己烷、庚烷和甲苯饱和空气界面处的动态表面张力和平衡表面张力，以及纯水在这些界面处的动态表面张力。采用了两种理论模型：两者均假设表面活性剂的吸附受扩散控制，且烷烃的吸附受扩散或动力学屏障控制。实验结果最好用该模型来描述，该模型表明CEO分子的吸附受扩散控制，而烷烃分子存在动力学屏障。还研究了平衡后烷烃从表面层的解吸及其随后从测量池中去除的过程。结果表明，庚烷和己烷的解吸过程较慢。然而，对于戊烷蒸气，解吸相当迅速，解吸开始后表面张力变得与纯空气界面处的表面张力相等。
