A glycerol-in-oil emulsion has decomposed into a single coalesced glycerol drop (right), but the incompressible particle-laden interface reacts by buckling into ripples and droplets. The image was produced via fluorescence confocal microscopy, with nanoparticles shown as green and glycerol as red; the optical transmission channel is overlaid in blue.
Folding of a particle-stabilized fluid-fluid interface —

A glycerol-in-oil emulsion has decomposed into a single coalesced glycerol drop (right), but the incompressible particle-laden interface reacts by buckling into ripples and droplets. The image was produced via fluorescence confocal microscopy, with nanoparticles shown as green and glycerol as red; the optical transmission channel is overlaid in blue.

https://fluids.ac.uk/files/11_Jason_Klebes_folding-interface-2.1543871245.png