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J Am Chem Soc. 2018 Nov 14;140(45):15176-15180. doi: 10.1021/jacs.8b09869. Epub 2018 Oct 30.

Monofacet-Selective Cavitation within Solid-State Silica-Nanoconfinement toward Janus Iron Oxide Nanocube.

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National Creative Research Initiative Center for Nanospace-Confined Chemical Reactions (NCCR) and Department of Chemistry , Pohang University of Science and Technology (POSTECH) , Pohang 37673 , South Korea.
Center for Soft and Living Matter, Institute for Basic Science (IBS) and Department of Biomedical Engineering , School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , South Korea.


Here, a highly selective solid-state nanocrystal conversion strategy is developed toward concave iron oxide (Fe3O4) nanocube with an open-mouthed cavity engraved exclusively on a single face. The strategy is based on a novel heat-induced nanospace-confined domino-type migration of Fe2+ ions from the SiO2-Fe3O4 interface toward the surrounding silica shell and concomitant self-limiting nanoscale phase-transition to the Fe-silicate form. Equipped with the chemically unique cavity, the produced Janus-type concave iron oxide nanocube was further functionalized with controllable density of catalytic Pt-nanocrystals exclusively on concave sites and utilized as a highly diffusive catalytic Janus nanoswimmer for the efficient degradation of pollutant-dyes in water.


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