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Some members of the vegetal kingdom can achieve surprisingly fast movementsmaking use of a clever combination of evaporation, elasticity and cavitation.In this process, enthalpic energy is transformed into elastic energy andsuddenly released in a cavitation event which produces kinetic energy. Here westudy this uncommon energy transformation by a model system: a droplet in anelastic medium shrinks slowly by diffusion and eventually transforms into abubble by a rapid cavitation event. The experiments reveal the cavity dynamicsover the extremely disparate timescales of the process, spanning 9 orders ofmagnitude. We model the initial shrinkage as a classical diffusive process,while the sudden bubble growth and oscillations are described using aninertial-(visco)elastic model, in excellent agreement with the experiments.Such a model system could serve as a new paradigm for motile syntheticmaterials.

Turning drops into bubbles: Elastic cavitation by diffusion