Fig. 2
Observation of the mechanism of bubble nucleation in supersaturated PDMS on top of water. 7.5 g AK1000 is put on top of 20 g water to increase the visibility of the bubbles forming at the interface and supersaturated for 1.5 h at 20 bars (ζoil ≈ 5). (a) Single bubbles nucleate below the oil-air interface and coalesce with air above. (b) Stirring causes the gas to migrate from the oil to the aqueous phase, nucleating heterogeneously at the container walls and the Teflon sealing and stirrer bar. Nucleation in the drops occurs simultaneously at the bottom of the container during emulsification.
