Dresden 2017 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
BP: Fachverband Biologische Physik
BP 17: Microswimmers II (Joint Session DY/BP)
BP 17.1: Talk
Tuesday, March 21, 2017, 14:30–14:45, HÜL 186
Self-propelled Janus Droplets: Properties and Applications — •Leonard Li1, Mahmoud Hosseinzadeh1, Martin Brinkmann1, Ignacio Pagonabarraga2, Ralf Seemann1, and Jean-Baptiste Fleury1 — 1Saarland University, 66123 Saarbrücken, Germany — 2University of Barcelona, 08028 Barcelona, Spain
We report the existence of a new type of self-propelling Janus droplets in a continuous oil/surfactant solution. At start, the self-propulsion originates from a Marangoni flow generated by the solvent solubilization into the oily phase. During active motion, the droplets absorb a large amount of surfactant, which is preferentially soluble in the solvent phase. This surfactant adsorption into the droplet and the loss of solvent from the droplet lead, after some time, to spontaneous water/solvent phase separation and the formation of Janus droplet. In the Janus state, the solvent-rich droplet acts as a sink for the surfactant molecules, which get transported to and dissolved in the trailing droplet and thus drive the locomotion. Depending on initial solvent concentration the time before phase separation and thus the duration in the different propulsion regimes and with it different delivery modes can be programmed. After describing the properties of these active janus droplets, we will present their possible applications.