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- W2032874417 abstract "Open tunnel oxide, α-MnO2, without any large stabilizing cation has been successfully synthesized by ozone-oxidation of Mn2+ in H2SO4. Three kinds of acid (H2SO4, HNO3, and HCl) and a wide variety of their concentrations and ozone-oxidation temperatures were tested to produce a well-crystallized α-MnO2 specimen. The ozone-oxidation of Mn2+ in H2SO4 alone provided α-MnO2 phase, while γ-MnO2 phases were always formed in HNO3 or HCl. High reaction temperatures (>70°C) and high concentrations of H2SO4 (>2M) were necessary for the α-MnO2 formation. X-ray and electron diffraction patterns confirmed that α-MnO2 has the hollandite-type structure with space group of I4/m (No. 87) and lattice constants of a=9.78 and c=2.85 Å. Scanning and transmission electron microscopy images revealed a needle-like morphology for the α-MnO2 crystals; the electron diffraction pattern verified the rod axis of the needle-like crystals in coincident with the direction of the tunnels. The nitrogen adsorption isotherm of α-MnO2 exhibited the character of a typical Type IV, according to the IUPAC classification. The chemical, thermogravimetric, and temperature-programmed-desorption analyses indicated that H2O molecules are occluded within the tunnel of α-MnO2. Although N2 molecules cannot penetrate the tunnel cavity, H2O molecules can be trapped in the narrow tunnels with strong adsorption potential." @default.
- W2032874417 created "2016-06-24" @default.
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- W2032874417 date "2001-06-01" @default.
- W2032874417 modified "2023-10-14" @default.
- W2032874417 title "Preparation and Characterization of Open Tunnel Oxide α-MnO2 Precipitated by Ozone Oxidation" @default.
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- W2032874417 doi "https://doi.org/10.1006/jssc.2001.9136" @default.
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