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A Green Strategy to Enhance a Liquid–Liquid Heterogeneous Reaction with a Magnetic Recyclable Pickering Emulsion
Author(s) -
Feng Linbin,
Wang Jianli,
Chen Liang,
Lu Meizhen,
Zheng Zhi,
Jing Ren,
Chen Hualiang,
Shen Xianbo
Publication year - 2015
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.201402856
Subject(s) - pickering emulsion , polystyrene , chemical engineering , magnetic nanoparticles , emulsion , nanoparticle , materials science , dichloromethane , aqueous solution , dispersion (optics) , surface modification , reaction rate , nanotechnology , chemistry , organic chemistry , catalysis , polymer , composite material , physics , optics , solvent , engineering
This work described a general strategy to enhance a typical organic–aqueous heterogeneous green oxidation reaction by introducing surface tunable magnetic nanoparticles into liquids to form a controllable Pickering emulsion. We synthesized cross‐linked polystyrene (PS)‐covered Fe 3 O 4 nanoparticles grafted with different N ‐alkyl imidazoles and systematically discussed the effect of surface properties on the formation of emulsions. By loading such particles, the dichloromethane–water‐based 2,2,6,6‐tetramethylpiperidine‐1‐oxyl‐mediated Montanari oxidation system was converted from the unstable millimeter‐scale dispersion into a stable micrometer‐scale emulsion, which significantly reduced the reactant transfer distance and resulted in a significantly high overall reaction rate. This reaction efficiency is elucidated in terms of unique properties inherent in an emulsion, including the self‐assembly of Fe 3 O 4 /PS and Fe 3 O 4 /PS[im‐C n ]Cl ( n =1, 4, 6, and 10) nanoparticles, well ensuring a large specific surface area of the water–oil interface.