A green strategy to enhance a liquid-liquid heterogeneous reaction by magnetic recyclable pickering emulsion
作者：Linbin Feng, Jianli Wang*, Liang Chen, Meizhen Lu, Zhi Zheng, Ren Jing, Hualiang Chen, Xianbo Shen.
關鍵字：heterogeneous catalysis，microreactors，Montanari oxidation，nanoparticles，Pickering emulsions，phase-transfer catalysis
論文來源：期刊
具體來源：ChemCatChem
發表時間：2015年
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 Fe3O4 nanoparticles grafting with different N-alkyl imidazoles, and systematically discussed the effect of surface properties on the formation of emulsions. By loading of such particles, the dichloromethane-water-based 2,2,6,6-tetramethylpiperidine-1-oxyl-mediated Montanari oxidation system was converted from the unstable millimeter-scale dispersions 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 in terms of unique properties inherent in an emulsion,including the self-assembled of Fe3O4/PS and Fe3O4/PS[im-Cn]Cl(n=1,4,6,10) nanoparticles, well ensuring a large specific surface area of the water-oil interface.
