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  • Title: Synthesis, assembly and reaction of a nanocatalyst in microfluidic systems: a general platform.
    Author: Lee SK, Liu X, Sebastián Cabeza V, Jensen KF.
    Journal: Lab Chip; 2012 Oct 21; 12(20):4080-4. PubMed ID: 22858757.
    Abstract:
    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 ~1 mg of material (containing ~50 μg 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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