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20230104_0013
Hypnotic iris
Contrary to appearances, this perfectly circular, iridescent membrane is not organic in nature. It is in fact a soap film stretched out by the action of centrifugal force. Illuminated by a laser beam that reveals its tiniest details, the film of soapy water is dotted with dark tearshaped spots that form at the edge of the film before migrating towards its centre. By studying their formation and the speed at which they move, the researchers can model the dynamics of the thinning of a soap bubble until it bursts. This type of analysis can help, for instance, to adapt the formulation of industrial foams to their intended use.
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