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Spatiotemporal control of cargo delivery performed by programmable self-propelled Janus droplets

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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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Communications Physics, 2018, vol. 1, p. 23

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Articles publicats en revistes (Física de la Matèria Condensada)

# metadata.dc.title[].value
Spatiotemporal control of cargo delivery performed by programmable self-propelled Janus droplets