Institute of Biocolloid Chemistry, Kiev, Ukraine.
Langmuir. 2012 May 1;28(17):6893-901. doi: 10.1021/la3006025. Epub 2012 Apr 16.
A system far from equilibrium, where the surfactant transfer from a small drop located in the aqueous bulk to the air-water interface results in spontaneous nonlinear oscillations of surface tension, is theoretically and experimentally considered. The oscillations in this system are the result of periodically arising and terminating Marangoni instability. The surfactant under consideration is octanoic acid, the dissociated form of which is much less surface-active than the protonated form. Numerical simulations show how the system behavior can be controlled by changes in pH and ionic strength of the aqueous phase. The results of numerical simulations are in good agreement with experimental data.
本文从理论和实验上研究了一个远离平衡的体系，在该体系中，表面活性剂从小滴转移到气-水界面会导致表面张力的自发非线性振荡。该体系中的振荡是周期性出现和终止的马兰戈尼不稳定性的结果。所考虑的表面活性剂是辛酸，其离解形式的表面活性远低于质子化形式。数值模拟表明，通过改变水相的 pH 值和离子强度，如何控制该体系的行为。数值模拟的结果与实验数据吻合良好。
