Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-02-16
Langmuir 22 (2006), 5986-5990
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 4 figures, 1 supplementary figure
Scientific paper
10.1021/la060388x
We report the behavior of particle-stabilized bubbles (armored bubbles) when exposed to various classes and concentrations of surfactants. The bubbles are non-spherical due to the jamming of the particles on the interface and are stable to dissolution prior to the addition of surfactant. We find that the dissolving bubbles exhibit distinct morphological, microstructural, and lifetime changes, which correlate with the concentration of surfactant employed. For low concentrations of surfactant an armored bubble remains non-spherical while dissolving, while for concentrations close to and above the surfactant CMC a bubble reverts to a spherical shape before dissolving. We propose a microstructural interpretation, supported by our experimental observations of particle dynamics on the bubble interface, that recognizes the role of interfacial jamming and stresses in particle stabilization and surfactant-mediated destabilization of armored bubbles.
Abkarian Manouk
Mejean Cecile
Stone Howard A.
Subramaniam Anand Bala
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