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Updated: Jul 17, 2026

Glass-Based Devices to Generate Drops and Emulsions
Published on: April 5, 2022
Drop formation by thermal fluctuations at an ultralow surface tension
Y Hennequin1, D G A L Aarts, J H van der Wiel
1Complex Fluids Group, van der Waals-Zeeman Instituut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands. yhennequ@science.uva.nl
Abstract:
We present experimental evidence that drop breakup is caused by thermal noise in a system with a surface tension that is more than 10(6) times smaller than that of water. We observe that at very small scales classical hydrodynamics breaks down and the characteristic signatures of pinch-off due to thermal noise are observed. Surprisingly, the noise makes the drop size distribution more uniform, by suppressing the formation of satellite droplets of the smallest sizes. The crossover between deterministic hydrodynamic motion and stochastic thermally driven motion has repercussions for our understanding of small-scale hydrodynamics, important in many problems such as micro- or nanofluidics and interfacial singularities.
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