Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris Sud 11, Orsay, France.
Departamento de Química Física I, Universidad Complutense, 28040 Madrid, Spain.
Adv Colloid Interface Sci. 2014 Apr;206:141-9. doi: 10.1016/j.cis.2014.01.006. Epub 2014 Jan 24.
In the presence of soluble surfactants, the motion of liquid surfaces involves Marangoni effects. As a consequence, the surfaces exhibit elastic responses, even frequently behaving as rigid surfaces, especially at low surfactant concentration. The Marangoni effects can be conveniently quantified introducing surface viscoelastic compression parameters that characterize the mechanical response of the surface near equilibrium. Many experimental techniques allow measuring the viscoelastic parameters. However, many difficulties are encountered during the interpretation of the surface response in the various types of hydrodynamic velocity fields involved in the different techniques. The role of adsorption and desorption energy barriers appears crucial, despite the fact that little is known yet about their values. In this short review, we will present examples illustrating the different problems.
在可溶性表面活性剂的存在下，液体表面的运动涉及到马兰戈尼效应。因此，表面表现出弹性响应，甚至经常表现为刚性表面，特别是在表面活性剂浓度较低时。可以通过引入表面粘弹性压缩参数来方便地量化马兰戈尼效应，这些参数可以描述表面在平衡附近的机械响应。许多实验技术允许测量粘弹性参数。然而，在解释各种技术中涉及的不同类型的流体动力速度场中的表面响应时，会遇到许多困难。尽管人们对它们的值知之甚少，但吸附和解吸能垒的作用似乎至关重要。在这篇简短的综述中，我们将展示一些例子来说明不同的问题。
