Stepwise thinning dynamics of a foam film formed from an anionic micellar solution

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• 作者：Jongju Lee ; Alex Nikolov ; Darsh Wasan ; ^{wasan@iit.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Stratification ; Foam film ; Micelle ; Dark spot ; Anionic surfactant
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：487
• 期：Complete
• 页码：217-222
• 全文大小：1036 K

文摘

Liquid films formed from a surfactant micellar solution thin in a stepwise fashion (stratify): the film thickness decreases layer-by-layer and dark spots appear (areas of the film with one micellar layer less than their surroundings). In a recent paper [Langmuir2016, 32, 4837–4847], we presented a two-dimensional diffusion model to explain the expansion of the dark spots inside the foam film formed from a nonionic surfactant micellar solution. Here, we apply the model to explain the dark spot expansion in the foam film formed from an anionic surfactant micellar solution of sodium dodecyl sulfate. We also apply this model to explain the expansion rate of the dark spot that makes contact with the meniscus. Our model adequately predicts the experimental measurements.