Fig. 5
(a) Amount of gas obtained from nucleation and bubble growth after supersaturation of 2.2 mL silicon oil for 15 min and emulsification in 5 mM SDS solution at 1200 rpm (red symbols). The dashed line presents the gas entrapment from stirring under pressure without oil (without 15 min supersaturation), while non-saturated oil compression to 20 bars and stirring gives 0.8 mL foam as illustrated in Figure S2. (b) Optical observation from emulsion with 100 mPa.s oil, illustrating the bimodal distribution of bubbles. The scale bar is 200 μm. (c) Schematic illustration of drop breakage and gas release in the continuous phase for low-viscosity oils. (d) Schematic illustration of the mechanism of bubble nucleation in large oil droplets, their growth, and eventual separation from the oil droplets in viscous oils.
