期刊
ADVANCED MATERIALS
卷 30, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801821
关键词
chemical transport; interfacial tension; Marangoni effect; photoactive microdroplets; spiropyran
类别
资金
- Australian Research Council (ARC) [DP 150104532]
- ARC Centre of Excellence Scheme [CE 140100012]
- Science Foundation Ireland under the Insight Centre [SFI/12/RC/2289]
The emulation of the complex cellular and bacterial vesicles used to transport materials through fluids has the potential to add revolutionary capabilities to fluidic platforms. Although a number of artificial motile vesicles or microdroplets have been demonstrated previously, control over their movement in liquid in 3D has not been achieved. Here it is shown that by adding a chemical fuel, a photoactive material, to the droplet, it can be moved in any direction (3D) in water using simple light sources without the need for additives in the water. The droplets can be made up of a range of solvents and move with speeds as high as 10.4 mm s(-1) toward or away from the irradiation source as a result of a light-induced isothermal change in interfacial tension (Marangoni flow). It is further demonstrated that more complex functions can be accomplished by merging a photoactive droplet with a droplet carrying a cargo and moving the new larger droplet to a reactor droplet where the cargo undergoes a chemical reaction. The control and versatility of this light-activated, motile droplet system will open up new possibilities for fluidic chemical transport and applications.
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