期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 8, 页码 3928-3933出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202010750
关键词
ionic liquids; microreactors; phase separation; light responsiveness; Pickering emulsion
资金
- National Natural Science Foundation of China [21803017, 21673068, 21733011, U1704251]
- National Key Research and Development Program of China [2017YFA0403101]
- 111 project [D17007]
- H2020 FET-OPEN-2016-2017 program of the European Commission [737266-ONE FLOW]
The study demonstrates a light-responsive Pickering emulsion that can undergo reversible transition between emulsification and demulsification triggered by UV and visible light. This system not only enables catalytic reaction and product separation, but also allows for the reuse of emulsifier and catalyst.
Pickering emulsions are an excellent platform for interfacial catalysis. However, developing simple and efficient strategies to achieve product separation and catalyst and emulsifier recovery is still a challenge. Herein, we report the reversible transition between emulsification and demulsification of a light-responsive Pickering emulsion, triggered by alternating between UV and visible light irradiation. The Pickering emulsion is fabricated from Pd-supported silica nanoparticles, azobenzene ionic liquid surfactant, n-octane, and water. This phase behavior is attributed to the adsorption of azobenzene ionic liquid surfactant on the surface of the nanoparticles and the light-responsive activity of ionic liquid surfactant. The Pickering emulsion can be used as a microreactor that enables catalytic reaction, product separation as well as emulsifier and catalyst recycling. Catalytic hydrogenation of unsaturated hydrocarbons at room temperature and atmospheric pressure has been performed in this system to demonstrate product separation and emulsifier and catalyst re-use.
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