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- W2321826870 abstract "The formation mechanism and crystal growth of TiO2 in high-temperature high-pressure fluids were studied using HCl or H2SO4 as additives. In situ synchrotron radiation powder X-ray diffraction reveals that phase-pure rutile TiO2 nanoparticles can be formed using HCl as additive, whereas phase-pure anatase TiO2 is obtained when H2SO4 is used as additive. The supercritical (or near-critical) conditions provide a fast, one-step synthesis of rutile TiO2 nanoparticles and when using a 1:1 volume ratio of isopropanol–water as solvent at a temperature of 300 °C and a pressure of 25 MPa particles with an average particle size of about 22 nm are obtained in 20 min. A detailed analysis by sequential Rietveld refinements shows that the formation of rutile TiO2 occurs by a combined transformation of anatase and brookite TiO2. Analysis of the unit cell dimensions of the nanoparticles shows a lattice expansion with decreasing particle size for anatase prepared with H2SO4 medium and this may explain the stability of anatase particles that are significantly larger than their critical size." @default.
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- W2321826870 date "2012-11-05" @default.
- W2321826870 modified "2023-10-16" @default.
- W2321826870 title "Rapid Hydrothermal Preparation of Rutile TiO<sub>2</sub> Nanoparticles by Simultaneous Transformation of Primary Brookite and Anatase: An in Situ Synchrotron PXRD Study" @default.
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- W2321826870 doi "https://doi.org/10.1021/cg301230w" @default.
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