2026-04-13T13:29:44Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1488422025-12-04T20:48:43Zcom_2072_1057col_2072_478822col_2072_478917

00925njm 22002777a 4500 dc Li, Menglin author Brinkmann, Martin author Pagonabarraga Mora, Ignacio author Seeman, Ralf author Fleury, Jean-Baptiste author 2020-01-28T13:52:07Z 2020-01-28T13:52:07Z 2018-03-03 2020-01-28T13:52:08Z 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. Transport biològic Molècules Microfluídica Física de partícules Biological transport Molecules Microfluidics Particle physics Spatiotemporal control of cargo delivery performed by programmable self-propelled Janus droplets