Synthesis of Al2O3 Nanopowders Using Inorganic Salt and Its Physical Chemistry

Abstract

Abstract: Boehmite (γ-AlOOH) powder was first prepared by Sol-Freeze Drying method using cheap AlCl₃·6H₂O as raw materials, and then γ-Al₂O₃
nanopowder with the average diameter of 6nm and α-Al₂O₃ nanopowder with the mean diameter of 30nm were obtained by the calcination of the above
γ-AlOOH powder at 500 and 1100℃, respectively. The potential～pH diagrams of Al-H₂O system at 25 and 90℃ were presented, separately. Thermodynamic analysis of the main reactions in the process of thermal
decomposition of Al(OH)₃ was also made using Temkin-Schwarzman’s method and by means of regression analysis. Investigations of the potential-pH diagrams of
Al-H₂O system and thermodynamic analysis of the thermal decomposition of Al(OH)₃ provide a certain guide for the formation of boehmite sol and the
heat treatment of boehmite powder, respectively.

Key words: inorganic salt, synthesis, Al₂O₃ nanopowders, physicochemistry

CLC Number:

TF123

ZENG Wen-Ming,CHEN Nian-Yi,GUI Lin--Hua,WANG Jun,GAO Lian,GUO Jing-Kun. Synthesis of Al₂O₃ Nanopowders Using Inorganic Salt and Its Physical Chemistry[J]. Journal of Inorganic Materials.

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Synthesis of Al₂O₃ Nanopowders Using Inorganic Salt and Its Physical Chemistry

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