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Kinetics of active water/ethanol Janus droplets

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Abstract

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.

Graphical abstract: Kinetics of active water/ethanol Janus droplets

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Supplementary files

Article information


Submitted
16 Mar 2020
Accepted
08 Jun 2020
First published
15 Jun 2020

Soft Matter, 2020, Advance Article
Article type
Paper

Kinetics of active water/ethanol Janus droplets

M. Li, M. Hosseinzadeh, I. Pagonabarraga, R. Seemann, M. Brinkmann and J. Fleury, Soft Matter, 2020, Advance Article , DOI: 10.1039/D0SM00460J

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