期刊
LAB ON A CHIP
卷 12, 期 20, 页码 4080-4084出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2lc40186j
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资金
- US Army Research Office through the Institute for Soldier Nanotechnology [DAAD-19-02-0002]
- US NSF grant [CHE-0714189]
- Fulbright Commission in Spain
- Ministry of Education in Spain
- Novartis International AG
We present a successive microfluidic approach to create and characterize hierarchical catalyst structures consisting of metal-decorated nanoparticles that are assembled into porous microparticles (supraball'' catalysts). First, using a silicon microreactor, platinum nanoparticles with a very narrow size distribution are grown and immobilized uniformly onto iron oxide/silica core-shell nanospheres. The Pt-decorated silica nanospheres are then assembled into uniform, spherical, micron-sized particles by using emulsion templates generated with a microfluidic drop generator. Finally, the assembled supraballs are loaded into a packed-bed microreactor for characterization of the catalytic reactivity. The prepared material showed excellent catalytic activity for the oxidation of aldehyde with only similar to 1 mg of material (containing similar to 50 mu g of platinum nanoparticles). After the reactions, all the supraball catalysts are recovered by using the magnetic property of the underlying iron oxide/silica core-shell nanospheres.
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