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Grzybowski, Bartosz A.
School of Natural Science
Research Interests
  • Nano science

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Systems of mechanized and reactive droplets powered by multi-responsive surfactants

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Title
Systems of mechanized and reactive droplets powered by multi-responsive surfactants
Author
Yang, ZhijieWei, JingjingSobolev, Yaroslav I.Grzybowski, Bartosz A.
Issue Date
201801
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE, v.553, no., pp.313 - 318
Abstract
Although ‘active’ surfactants, which are responsive to individual external stimuli such as temperature1, electric2,3 or magnetic4 fields, light5,6, redox processes6,7 or chemical agents8, are well known, it would be interesting to combine several of these properties within one surfactant species. Such multi-responsive surfactants could provide ways of manipulating individual droplets and possibly assembling them into larger systems of dynamic reactors9,10. Here we describe surfactants based on functionalized nanoparticle dimers that combine all of these and several other characteristics. These surfactants and therefore the droplets that they cover are simultaneously addressable by magnetic, optical and electric fields. As a result, the surfactant-covered droplets can be assembled into various hierarchical structures, including dynamic ones, in which light powers the rapid rotation of the droplets. Such rotating droplets can transfer mechanical torques to their non-nearest neighbours, thus acting like systems of mechanical gears. Furthermore, droplets of different types can be merged by applying electric fields and, owing to interfacial jamming11,12, can form complex, non-spherical, ‘patchy’ structures with different surface regions covered with different surfactants. In systems of droplets that carry different chemicals, combinations of multiple stimuli can be used to control the orientations of the droplets, inter-droplet transport, mixing of contents and, ultimately, sequences of chemical reactions. Overall, the multi-responsive active surfactants that we describe provide an unprecedented level of flexibility with which liquid droplets can be manipulated, assembled and reacted.
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DOI
http://dx.doi.org/10.1038/nature25137
ISSN
0028-0836
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