Dresden 2017 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Posters - Soft Particles, Microswimmers, Microfluidics
DY 25.13: Poster
Dienstag, 21. März 2017, 18:15–21:00, P3
Self-Chemotactic Properties of Active Droplets — •Mahmoud Hosseinzadeh1, Leonard Li1, Martin Brinkmann1, Ignacio Pagonabarraga2, Ralf Seemann1, and Jean-Baptiste Fleury1 — 1Saarland University, 66123 Saarbrücken, Germany — 2University of Barcelona, 08028 Barcelona, Spain
We explore the self-chemotactic properties of a new type of water/solvent emulsion droplets, which self-propel in a continuous oil/surfactant solution. Depending on solvent concentration the droplets evolve in up to three stages finally forming Janus droplets. We concentrate on the first stage, where the propulsion is generated by a Marangoni flow originating from the solvent solubilization into the oily phase. During active motion, the droplets additionally absorb a large amount of surfactant, which is preferentially soluble in the solvent phase. An increasing ethanol concentration in the continuous phase and a decreasing surfactant concentrations leads to repulsive chemotactic interactions. By adjusting the initial ethanol and surfactant concentration in the continuous phase we vary the chemotactic interactions of the droplets. In particular, we explore the consequences of the self-chemotactic properties in terms of flow properties (squirmer modes).