Dissolution Arrest and Stability of Armored Bubbles

Details Dissolution Arrest and Stability of Armored Bubbles Dissolution Arrest and Stability of Armored Bubbles

2007-03-25

arxiv.org/abs/cond-mat/0703653v1

PRL 99 (2007), 188301

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 3 figures. Submitted to PRL

Scientific paper

10.1103/PhysRevLett.99.188301

Dissolving armored bubbles stabilize with nonspherical shapes by jamming the initially Brownian particles adsorbed on their interfaces. In a gas-saturated solution, these shapes are characterized by planar facets or folds for decreasing ratios of the particle to bubble radii. We perform numerical simulations that mimic dissolution, and show that the faceted shape represents a local minimum of energy during volume reduction. This minimum is marked by the vanishing of the Laplace overpressure $\Delta P$, which together with the existence of a $V$-interval where $d\Delta P/dV>0$ guarantees stability against dissolution. The reduction of $\Delta P$ is due to the saddle-shape deformation of most of the interface which accompanies the reduction in the mean curvature of the interface.

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