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Synthesis of thoria nanoparticles via the hydrothermal method in supercritical condition

Moeini, M ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matlet.2012.04.125
  3. Publisher: Elsevier , 2012
  4. Abstract:
  5. Thorium dioxide (thoria) nano-particle was synthesized by employing supercritical water (SCW) as an excellent reaction environment for hydrothermal crystallization of metal oxide particles. This method is ideal for production of ultrafine powder having controlled stoichiometry, high quality, purity and crystallinity. The nano-crystalline thoria was prepared in a stainless steel (316 L) autoclave, fed with an aqueous solution of Th(NO 3) 4.5H 2O as a reactant and took place under SCW condition up to 450 °C for 45 min. The product was recovered and characterized by X-Ray Diffraction (XRD), Thermal Gravimetry Analysis (TG/DTA) and Brunauer, Emmett and Teller (BET) surface area analysis. The crystallite size of the product was calculated by the Scherrer and Williamson-Hall equations and was subsequently measured by the Transmission Electron Microscopy (TEM) analysis. The average size was found to be about less than 27 nm with a particle size distribution in the 5-31 nm range
  6. Keywords:
  7. Average size ; Controlled stoichiometry ; Crystallinities ; High quality ; Hydrothermal ; Hydrothermal crystallization ; Hydrothermal methods ; Metal oxide particles ; Nanocrystallines ; Supercritical condition ; Supercritical water ; Surface area analysis ; Thermal gravimetry ; Transmission electron microscopy tem ; Ultra fine powder ; Williamson-Hall equation ; Crystalline materials ; Nanoparticles ; Particle size analysis ; Stoichiometry ; Synthesis (chemical) ; Thoria ; Transmission electron microscopy ; X ray diffraction ; Quality control
  8. Source: Materials Letters ; Volume 81 , 2012 , Pages 99-101 ; 0167577X (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0167577X12006179