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• W2091860412 abstract "Cobalt aluminate/γ-alumina (CoAl2O4/γ-Al2O3) nanocomposite pigment with mesoporous structure has been synthesized. The method simply involves adsorption of Co2+ ion on the surface of a commercially available boehmite (AlOOH) powder followed by the reaction of Co2+ and AlOOH at relatively low temperature (500 °C) to obtain CoAl2O4/γ-Al2O3 composite nanopowders. The formation of γ-Al2O3 from boehmite induces the in situ generation of isostructural CoAl2O4 (both crystallize as cubic spinel) at such a low temperature. The obtained intense blue powder of optimal composition (53.6 wt % CoAl2O4 in γ-Al2O3) can be dispersed in glycerol and characterized by UV–visible, X-ray diffraction, Raman spectroscopy, TEM, and nitrogen sorption analyses. Raman studies confirm the formation of CoAl2O4 phase in γ-Al2O3. TEM studies reveal the formation of flake shaped (5–10 nm in width and 10–25 nm in length) nanopowders, and these flakes are assembled to form mesoporous structure. The specific surface area, total pore volume and average pore diameter of this powder are estimated to be ∼118 m2 g–1, 0.1375 cm3 g–1, and 4.65 nm, respectively. This composite nanopowder has been used as an active catalyst for the decomposition of H2O2 at room temperature and the decomposition follows the first order kinetics with rate constant value close to 2.3 × 10–2 min–1. This pigment nanopowder can be reused for several cycles without noticeable degradation of its original catalytic activity." @default.
• W2091860412 created "2016-06-24" @default.
• W2091860412 creator A5066294319 @default.
• W2091860412 creator A5084700402 @default.
• W2091860412 date "2011-12-15" @default.
• W2091860412 modified "2023-09-26" @default.
• W2091860412 title "Host-Mediated Synthesis of Cobalt Aluminate/γ-Alumina Nanoflakes: A Dispersible Composite Pigment with High Catalytic Activities" @default.
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• W2091860412 doi "https://doi.org/10.1021/am201283c" @default.
• W2091860412 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22122010" @default.
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