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A Green Strategy to Enhance a Liquid-Liquid Heterogeneous Reaction with a Magnetic Recyclable Pickering Emulsion.
- Source :
- ChemCatChem; Feb2015, Vol. 7 Issue 4, p616-624, 9p
- Publication Year :
- 2015
-
Abstract
- 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<subscript>3</subscript>O<subscript>4</subscript> 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<subscript>3</subscript>O<subscript>4</subscript>/PS and Fe<subscript>3</subscript>O<subscript>4</subscript>/PS[im-C<subscript> n</subscript>]Cl ( n=1, 4, 6, and 10) nanoparticles, well ensuring a large specific surface area of the water-oil interface. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18673880
- Volume :
- 7
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- ChemCatChem
- Publication Type :
- Academic Journal
- Accession number :
- 101698139
- Full Text :
- https://doi.org/10.1002/cctc.201402856