Skip to Main content Skip to Navigation
Journal articles

Self-Propulsion of Pure Water Droplets by Spontaneous Marangoni-Stress-Driven Motion

Abstract : We report spontaneous motion in a fully biocompatible system consisting of pure water droplets in an oil-surfactant medium of squalane and monoolein. Water from the droplet is solubilized by the reverse micellar solution, creating a concentration gradient of swollen reverse micelles around each droplet. The strong advection and weak diffusion conditions allow for the first experimental realization of spontaneous motion in a system of isotropic particles at sufficiently large Péclet number according to a straightforward generalization of a recently proposed mechanism [S. Michelin, E. Lauga, and D. Bartolo, Phys. Fluids 25, 061701 (2013); S. Michelin and E. Lauga, J. Fluid Mech. 747, 572 (2014)]. Experiments with a highly concentrated solution of salt instead of water, and tetradecane instead of squalane, confirm the above mechanism. The present swimming droplets are able to carry external bodies such as large colloids, salt crystals, and even cells.
Document type :
Journal articles
Complete list of metadata

Cited literature [27 references]  Display  Hide  Download
Contributor : Denis Roura Connect in order to contact the contributor
Submitted on : Tuesday, February 10, 2015 - 12:45:35 PM
Last modification on : Monday, December 13, 2021 - 1:16:01 PM
Long-term archiving on: : Monday, May 11, 2015 - 10:30:54 AM


Publisher files allowed on an open archive



Ziane Izri, Marjolein N. van Der Linden, Sébastien Michelin, Olivier Dauchot. Self-Propulsion of Pure Water Droplets by Spontaneous Marangoni-Stress-Driven Motion. Physical Review Letters, American Physical Society, 2014, 113 (24), pp.248302. ⟨10.1103/PhysRevLett.113.248302⟩. ⟨hal-01114975⟩



Record views


Files downloads