Berlin 2018 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Microswimmers I (joint session DY/BP/CPP)
DY 32.3: Vortrag
Dienstag, 13. März 2018, 14:30–14:45, BH-N 243
Controlled Control of Cargo Delivery Performed by Self-Propelled Janus Droplets — •Menglin Lee1, Martin Brinkmann1, Ignacio Pagonabarraga2, Ralf Seemann1, and Jean-Baptiste Fleury1 — 1Saarland University, Saarbruecken, Germany — 2University of Barcelona, Bracelona, spain
We propose a class of programmable carrier droplets that can be made of a water/ethanol mixture dispensed in a continuous oil/surfactant solution. While swimming, the droplets pass through up to three stages whose appearance and duration are determined by the chemical composition of the droplet and the surrounding phase. A spontaneous de-mixing of the initially homogeneous droplet phase controlled by an uptake of surfactant and simultaneous loss of ethanol is generally observed. The phase segregation can lead to the formation of characteristic Janus droplets which consist of a water-rich and an ethanol-rich droplet. During de-mixing cargo molecules, like DNA, can be separated in the trailing ethanol--rich droplet and are "carried like in a backpack". Delivery is obtained whenever the trailing droplet touches a wettable target. Selective attraction or repulsion from targets is determined by the long--range hydrodynamic interactions of the swimmers with the geometric shape of the targets. In combination with a controlled delay of phase separation by the initial chemical composition of the droplets, we can exploit this selectivity to deliver DNA molecules dissolved in the ethanol-rich droplet at specific target sites and during a specific timeframe.
(under review - 2017)