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Monofacet-Selective Cavitation within Solid-State Silica-Nanoconfinement toward Janus Iron Oxide Nanocube
- Lee, Sunyi, Kumari, Nitee, Jeon, Ki-Wan, Kumar, Amit, Kumar, Sumit, Koo, Jung Hun, Lee, Jihwan, Cho, Yoon-Kyoung, Lee, In Su
- Journal of the American Chemical Society 2018 v.140 no.45 pp. 15176-15180
- ions, iron, nanocrystals, phase transition, silica
- 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.