SYNTHESIS AND PHYSICO-CHEMICAL PROPERTIES OF NANODISPERSED ALUMINUM OXIDE

Abstract

γ-Aluminium oxide was synthesized by the method of homogeneous chemical deposition from aluminum nitrate solution by mono- and diethanolamines with subsequent heat treatment. Conditions (molar ratios, synthesis time and temperature) allowing to synthesize stable nanoparticles have been determined. It is shown that the use of hydrolytic agents in the DEA>MEA sequence and the increase of the OH-:Me+ ratio lead to the improvement of the material texture parameters. It was found that, at a molar ratio in the MEA (DEA)/Al=2 reaction mixture, the synthesized Al₂O₃ nanoparticles have an average estimated diameter depending on the calcination temperature of 4.09-6.56 nm and a specific surface of 136-246 sm³/g. As the temperature increases up to 850°C, a highly porous microstructure of γ-Al₂O₃ lattice with clear interference maximums belonging to the phase of highly organized cubic structure is formed against the background of X-ray amorphous component