ArticleProceedings of the National Academy of Sciences of the United States of America2023
Oil-on-water droplets faceted and stabilized by vortex halos in the subphase.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Marangoni-overriding flow in laser-irradiated particle-capped droplets.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Thermal Marangoni natural convection enables directional transport across immiscible liquids.Nature communications · 2025Article
- A hovering bubble with a spontaneous horizontal oscillation.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
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7 authors.
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Abstract
For almost 200 y, the dominant approach to understand oil-on-water droplet shape and stability has been the thermodynamic expectation of minimized energy, yet parallel literature shows the prominence of Marangoni flow, an adaptive gradient of interfacial tension that produces convection rolls in the water. Our experiments, scaling arguments, and linear stability analysis show that the resulting Marangoni-driven high-Reynolds-number flow in shallow water overcomes radial symmetry of droplet shape otherwise enforced by the Laplace pressure. As a consequence, oil-on-water droplets are sheared to become polygons with distinct edges and corners. Moreover, subphase flows beneath individual droplets can inhibit the coalescence of adjacent droplets, leading to rich many-body dynamics that makes them look alive. The phenomenon of a "vortex halo" in the liquid subphase emerges as a hidden variable.
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