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Marangoni Bursting: Evaporation-Induced Emulsification of Binary Mixtures on a Liquid Layer

2017; American Physical Society; Volume: 118; Issue: 7 Linguagem: Inglês

10.1103/physrevlett.118.074504

1092-0145

Ludovic Keiser, Hadrien Bense, Pierre Colinet, José Bico, Étienne Reyssat,

Innovative Microfluidic and Catalytic Techniques Innovation

Adjusting the wetting properties of water through the addition of a miscible liquid is commonly used in a wide variety of industrial processes involving interfaces. We investigate experimentally the evolution of a drop of water and volatile alcohol deposited on a bath of oil: The drop spreads and spontaneously fragments into a myriad of minute droplets whose size strongly depends on the initial concentration of alcohol. Marangoni flows induced by the evaporation of alcohol play a key role in the overall phenomenon. The intricate coupling of hydrodynamics, wetting, and evaporation is well captured by analytical scaling laws. Our scenario is confirmed by experiments involving other combinations of liquids that also lead to this fascinating phenomenon.