Cervantes-Martínez Alfredo, Saint-Jalmes Arnaud, Maldonado Amir, Langevin Dominique
Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Apdo. Postal 130, Sonora, 83000 Hermosillo, Mexico.
J Colloid Interface Sci. 2005 Dec 15;292(2):544-7. doi: 10.1016/j.jcis.2005.06.007. Epub 2005 Jul 11.
We report results of drainage in aqueous foams of small bubble size D (D=180 microm) prepared with SDS-dodecanol solutions. We have performed free-drainage experiments in which local drainage rates are measured by electrical conductivity and by light scattering techniques. We have investigated the role of the surfactant-cosurfactant mass ratio on the drainage regime. The results confirm that a drainage regime corresponding to a high surface mobility can indeed be found for such small bubbles, and show that an increase in the cosurfactant content can induce a transition to a low surface mobility drainage regime. We show that the transition is not linked to variations of the bulk properties, but rather to variations of the interfacial properties. However, the results show that the added amount of dodecanol to trigger the transition is quite high, evidencing that the relevant control parameter for drainage regimes includes both bubble size and interfacial contributions.
我们报告了用十二烷基硫酸钠 - 十二醇溶液制备的小气泡尺寸D（D = 180微米）的水性泡沫中的排水结果。我们进行了自由排水实验，其中通过电导率和光散射技术测量局部排水速率。我们研究了表面活性剂 - 助表面活性剂质量比对排水状态的作用。结果证实，对于这种小气泡确实可以找到对应于高表面迁移率的排水状态，并表明助表面活性剂含量的增加可诱导向低表面迁移率排水状态的转变。我们表明，这种转变与本体性质的变化无关，而是与界面性质的变化有关。然而，结果表明引发转变所需的十二醇添加量相当高，这表明排水状态的相关控制参数包括气泡尺寸和界面贡献。
