Fig. 4: Foamed emulsion structure.

a Sample structure after 96 h at different ϕ. From top left to bottom left, clockwise: ϕ = 0.70, 0.75, 0.80, 0.85. The edge of each frame is 4 cm. The corresponding skew of the distributions is indicated by a star in Fig. 3b. At higher ϕ the foam structure becomes highly unconventional with unrelaxed bubble shapes and uneven emulsion distribution. b Sample at ϕ = 0.80 after 5 days. Chains of large bubbles and regions of small bubbles become clearly visible. Edge size 12 cm. c Enlargement showing the emulsion bulge at the ends of the thin Plateau borders between large bubbles. Edge size 3 cm. d Sample having ϕ = 0.80 made with sunflower oil, after 12 days. The edge of the frame is 13 cm. Segregation into regions of large and small bubbles is complete.