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Title: Spatiotemporal control of cargo delivery performed by programmable self-propelled Janus droplets
Author: Li, Menglin
Brinkmann, Martin
Pagonabarraga Mora, Ignacio
Seeman, Ralf
Fleury, Jean-Baptiste
Keywords: Transport biològic
Física de partícules
Biological transport
Particle physics
Issue Date: 3-Mar-2018
Publisher: Springer Nature
Abstract: Self-propelled droplets capable of transporting cargo to specific target locations are desired tools for many future applications. Here we propose a class of active droplets with programmable delivery time that are attracted or repelled by certain obstacle geometries. These droplets consist of a water/ethanol mixture and are dispersed in an oil/surfactant solution. Owing to a mass exchange between fluid phases during self-propulsion, the initially homogeneous droplets spontaneously de-mix and evolve into characteristic Janus droplets. Cargo molecules, like DNA, can be separated into the trailing ethanol-rich droplet and are carried to their target location 'like in a backpack'. The delayed onset of phase separation provides a handle to control the time frame of delivery, while long-ranged hydrodynamic interactions and short-ranged wetting forces are exploited to achieve the desired spatial specificity with respect to obstacle geometry and surface chemistry.
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It is part of: Communications Physics, 2018, vol. 1, p. 23
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Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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