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Issue 24, 2016
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Life and death of not so “bare” bubbles

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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 (<cmc) while its locus moves towards the top of the bubble cap as the concentration increases above the cmc. In order to explain this transition, we propose that marginal regeneration may be responsible for bubble rupture at low concentrations but that bursting at the apex for higher concentrations is driven by gravitational drainage.

Graphical abstract: Life and death of not so “bare” bubbles

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The article was received on 22 Jan 2016, accepted on 09 May 2016 and first published on 09 May 2016

Article type: Paper
DOI: 10.1039/C6SM00178E
Citation: Soft Matter, 2016,12, 5276-5284
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    Life and death of not so “bare” bubbles

    L. Champougny, M. Roché, W. Drenckhan and E. Rio, Soft Matter, 2016, 12, 5276
    DOI: 10.1039/C6SM00178E

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