Kinetics of active water/ethanol Janus droplets

Menglin Li, Mahmoud Hosseinzadeh, Ignacio Pagonabarraga, Ralf Seemann, Martin Brinkmann, Jean-Baptiste Fleury

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
18 Downloads (Pure)


Droplets made of a water/ethanol mixture spontaneously self-propel in an oil/surfactant solution and, depending on the initial ethanol concentration at the time of production, may evolve in up to three stages. Upon self-propulsion the droplets absorb surfactant molecules during their continuous motion in the oily phase. In combination with the continuous loss of ethanol this mass exchange with the ambient phase may lead to a spontaneous phase separation of the water/ethanol mixture, and eventually to the formation of characteristic
Janus droplets. Supported by experimental evidence, we propose a simple model that is
able to explain the propulsion velocity and its scaling with the droplet radius in the last stage of the droplet evolution.
Original languageEnglish
Pages (from-to)6803-6811
Number of pages9
JournalSoft Matter
Issue number29
Early online date15 Jun 2020
Publication statusPublished - 7 Aug 2020


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