期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 26, 页码 8687-8691出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900917
关键词
host-guest interaction; light responsiveness; motion control; nanomotors
资金
- European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2012)/ERC-StG [307679]
- National Natural Science Foundation of China [31800835]
- Ministry of Education, Culture and Science [024.001.035]
- NWO Chemiche Wetenschappen VIDI grant [723.015.001]
- Pearl River Youth Scholar Funded Scheme
- European Research Council [ENCOPOL 74092]
Controlling the motion of artificial self-propelled micro- and nanomotors independent of the fuel concentration is still a great challenge. Here we describe the first report of speed manipulation of supramolecular nanomotors via blue light-responsive valves, which can regulate the access of hydrogen peroxide fuel into the motors. Light-sensitive polymeric nanomotors are built up via the self-assembly of functional block copolymers, followed by bowl-shaped stomatocyte formation and incorporation of platinum nanoparticles. Subsequent addition of beta-cyclodextrin (beta-CD) leads to the formation of inclusion complexes with the trans-isomers of the azobenzene derivatives grafted from the surfaces of the stomatocytes. beta-CDs attachment decreases the diffusion rate of hydrogen peroxide into the cavities of the motors because of partly blocking of the openings of the stomatocyte. This results in a lowering of the speed of the nanomotors. Upon blue light irradiation, the trans-azobenzene moieties isomerize to the cis-form, which lead to the detachment of the beta-CDs due to their inability to form complexes with the cis-isomer. As a result, the speed of the nanomotors increases accordingly. Such a conformational change provides us with the unique possibility to control the speed of the supramolecular nanomotor via light-responsive host-guest complexation. We envision that such artificial responsive nano-systems with controlled motion could have potential applications in drug delivery.
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