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Magnetic Superhydrophobic Polymer Nanosphere Cage as a Framework for Miceller Catalysis in Biphasic Media
Author(s) -
Zheng Zhi,
Wang Jianli,
Chen Hualiang,
Feng Linbin,
Jing Ren,
Lu Meizhen,
Hu Bao,
Ji Jianbing
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201400009
Subject(s) - pickering emulsion , micelle , catalysis , polymer , chemical engineering , amphiphile , emulsion , materials science , chemistry , magnetic nanoparticles , nanotechnology , copolymer , organic chemistry , nanoparticle , aqueous solution , engineering
This study demonstrated the use of a magnetic superhydrophobic polymer nanosphere cage derived from a Pickering emulsion as a framework for miceller catalysis in biphasic media. We designed this system through the covalent stabilisation of active site (2,2,6,6‐tetramethylpiperidine 1‐oxyl)‐grafted amphiphiles onto the magnetic hydrophobic core to form a micelle‐like architecture and used it as a Pickering emulsifier to develop a new kind of micelle‐catalysed biphasic system. The catalysis results reveal that these fixed micelle‐tethered 2,2,6,6‐tetramethylpiperidine 1‐oxyl catalysts demonstrate much higher activity than their soluble counterparts in the biphasic Montanari oxidation of alcohols, which could be due to the unique properties of Pickering emulsion and miceller catalysis. In addition, the excellent magnetic response ensures the efficient recycling of the catalyst by magnetic decantation. The catalyst can be recycled at least 10 times without significant loss of activity or degradation of magnetic susceptibility. Moreover, this study demonstrates that this new Pickering emulsion‐based and micelle‐catalysed biphasic system is technically simple and practically applicable.