Laboratoire de Physique des Solides, Université Paris Sud 11, UMR CNRS 8502, 91405 Orsay France.
Laboratoire de Physique des Solides, Université Paris Sud 11, UMR CNRS 8502, 91405 Orsay France.
Adv Colloid Interface Sci. 2015 Aug;222:377-84. doi: 10.1016/j.cis.2014.09.002. Epub 2014 Sep 18.
The paper discusses adsorption and desorption energy barriers for macroscopic interfaces of surfactant solutions. Literature data suggest that adsorption and desorption are not always fully diffusion controlled. Apart from electrostatic barriers that lead to strong deviations, other types of barriers are less easy to identify, because smaller deviations from diffusion controlled mechanisms are evidenced. Complete models involving both diffusion and sorption barriers are very complex and involve many adjustable parameters, making the data analysis frequently unreliable. Empirical equations of state are used in most cases, although they are inaccurate, especially close to the cmc. The variation of sorption energies with surface concentration is not accurately described in the models. Finally, convection can mask the effect of sorption energy barriers. Experiments are presented to illustrate the main difficulties encountered.
本文讨论了表面活性剂溶液宏观界面的吸附和解吸能垒。文献资料表明，吸附和解吸并不总是完全扩散控制的。除了导致强烈偏离的静电势垒外，其他类型的势垒较难识别，因为扩散控制机制的较小偏离证据不足。涉及扩散和吸附势垒的完整模型非常复杂，涉及许多可调参数，这使得数据分析经常不可靠。在大多数情况下使用经验状态方程，尽管它们不准确，特别是在接近 cmc 时。模型不能准确描述吸附能垒随表面浓度的变化。最后，对流可能会掩盖吸附能垒的影响。实验结果说明了所遇到的主要困难。
