Four wet chemical methods of manufacturing isometric nanoparticles of corundum was compared. This was: calcination of as-recived precipitate, calcination of hydrothermaly crystallized precursor, the citrate-nitrate method and calcination of AACH precursor - AACH method. In the first three methods the starting material was aluminum nitrate, in fourth method it was aluminum ammonium sulfate from which was precipitated AACH (aluminum ammonium carbonate hydroxide). Powders were crystallized at temperatures which limited corundum crystallites growth and maximize participation of alpha-Al₂O₃ phase. Intensive milling was used during calcination as well as the end of calcination. The DSC/TG method was used to characterize precursors of alumina oxide during calcination. Phase composition and specific surface area  were determined by X-ray diffraction and BET methods, according to method of manufacturing and temperature of calcination. Particle size distribution was designated by laser method (DLS) and morphology of obtained powders was observed by Transmission Electron Microscopy (TEM). It was found that the milling precursors operation decreased the temperature of crystallizing alpha-phase. Crystallites shape which was closest to the spherical was obtained using the citrate-nitrate and AACH method.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/25081 must be provided.

1. Anisotropy of selected properties of Al₂O₃-graphene composite
2. [CEPT] Nanohydroxyapatite-polylactide composites  for regenerative implants
3. [CEPT] Studies of nanoparticles size distribution
4. Characteristic of hydroxyapatite dense nanoceramic produced by The High Pressure Consolidation  
5. Badania rozkładu wielkości cząstek i potencjału zeta w Laboratorium Nanostruktur dla Fotoniki i Nanomedycyny CePT
6. Synthesis of highly biocompatible hydroxyapatite nanopowders
7. Influence of hydrogen on hydrogenated cadmium telluride optical spectra
8. HRTEM and TEM studies of amorphous structures in ZrNiTiCu base alloys obtained by rapid solidification or ball milling
9. TEM Characterization of Thin-Layered Materials
10. Influence of hydrogen on optical spectra of hydrogenated CdTe
11. Microstructure and micro mechanical properties of multilayer Cr/CrN, PLD coatings
12. Search for New Metallic Glass Compositions in NiZrTi Base Alloys Near Multicomponent Eutectic Positions
13. Multi- layer composite based on amorphous materials and quasicrystals, deposited by laser ablation