表面活性剂溶液在薄水层上的铺展：溶解度和胶束解体的影响
Spreading of surfactant solutions over thin aqueous layers: influence of solubility and micelles disintegration.
作者信息
Lee K S, Starov V M
机构信息
Department of Chemical Engineering, Loughborough University, Loughborough, LE11 3TU, UK.
出版信息
J Colloid Interface Sci. 2007 Oct 15;314(2):631-42. doi: 10.1016/j.jcis.2007.06.009. Epub 2007 Jun 14.
A moving circular wave front forms after a small droplet of aqueous surfactant solution is deposited on a thin aqueous layer. The time evolution of the radius of the moving front was monitored. Surfactants of different solubility were used at concentrations above CMC. It is shown that the time evolution of the moving front proceeds in two stages: a rapid first stage, which is followed by a slower second stage. It is shown that the time evolution of the moving front substantially depends on the surfactant solubility. An exact solution for the evolution of the moving front was deduced for the case of insoluble surfactants. A qualitative theory was developed to account for the influence of the solubility on the front motion. Our experimental observations are in a good agreement with the theory predictions.
在将一小滴表面活性剂水溶液滴在薄水层上后，会形成一个移动的圆形波前。监测了移动波前半径的时间演变。在高于临界胶束浓度（CMC）的浓度下使用了不同溶解度的表面活性剂。结果表明，移动波前的时间演变分为两个阶段：快速的第一阶段，随后是较慢的第二阶段。结果表明，移动波前的时间演变很大程度上取决于表面活性剂的溶解度。针对不溶性表面活性剂的情况，推导了移动波前演变的精确解。发展了一种定性理论来解释溶解度对波前运动的影响。我们的实验观察结果与理论预测非常吻合。
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