Crystallization of anatase nanoparticles from amorphous precipitate by a continuous hydrothermal process
| Autor: | Kinga A. Malinger, Jean-François Hochepied, Alain Thorel, Alain Gaunand, Aude Maguer |
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| Přispěvatelé: | CEP/Paris, Centre Énergétique et Procédés (CEP), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Centre des Matériaux (MAT), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Anatase
Materials science General Chemical Engineering 02 engineering and technology 010402 general chemistry 7. Clean energy 01 natural sciences Industrial and Manufacturing Engineering Hydrothermal circulation law.invention [SPI.MAT]Engineering Sciences [physics]/Materials law Fast synthesis Specific surface area Environmental Chemistry Crystallization Continuous hydrothermal crystallization Precipitation (chemistry) General Chemistry Anatase nanoparticles 021001 nanoscience & nanotechnology 0104 chemical sciences Amorphous solid Crystallography Chemical engineering Particle Particle size Continuous synthesis 0210 nano-technology |
| Zdroj: | Chemical Engineering Journal Chemical Engineering Journal, Elsevier, 2011, 174, pp.445-451. ⟨10.1016/j.cej.2011.08.065⟩ |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2011.08.065⟩ |
| Popis: | International audience; Anatase nanoparticles with controlled size in the range 7-13 nm were synthesized by a continuous hydrothermal crystallization of amorphous TiO2 precipitate in a tubular reactor. The amorphous precursor was obtained from a double jet precipitation of TiCl4 with NaOH at pH 3. Hydrothermal crystallization was performed in a tubular reactor. Two main parameters were studied: the mean residence time of the slurry ranged from 10 to 30 min and transformation temperature from 120 to 220 °C. All samples have been characterized by Transmission Electron Microscopy, X-ray diffraction, and specific surface area measurement by N2 adsorption/desorption measurements. Well-crystallized anatase particles were obtained within few minutes at temperatures as low as 120 °C with a low polydispersity. Relationship between particle size and process parameters as temperature and residence time was determined. Due to the very slight variations in particle size vs process parameters, it is necessary to add up several techniques to give a reliable description of the samples as far as average aspect ratio, characteristic size and polydispersity are concerned. We propose to rely on TEM to get the average aspect ratio, then to rely on specific surface area to get the average particle size, and finally to check the consistency of these results with TEM and XRD peaks broadening. This self-consistent approach of particle characterization provides a correct and accurate description of the samples, and helps to optimize process parameters for photocatalytic applications, for instance. |
| Databáze: | OpenAIRE |
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