Life and death of not so "bare" bubbles
Lorène Champougny1, Matthieu Roché, Wiebke Drenckhan
1Laboratoire de Physique des Solides, UMR 8502 CNRS & Université Paris-Sud, Université Paris Saclay, 91405 Orsay Cedex, France. emmanuelle.rio@u-psud.fr.
Abstract:
In this paper, we investigate how the drainage and rupture of surfactant-stabilised bubbles floating at the surface of a liquid pool depend on the concentration of surface-active molecules in water. Drainage measurements at the apex of bubbles indicate that the flow profile is increasingly plug-like as the surfactant concentration is decreased from several times the critical micellar concentration (cmc) to just below the cmc. High-speed observations of bubble bursting reveal that the position at which a hole nucleates in the bubble cap also depends on the surfactant concentration. On average, the rupture is initiated close to the bubble foot for low concentrations (
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