Synthesis of γ- Al2O3 nanoparticles by chemical precipitation method①
来源期刊：中南大学学报(英文版)2005年第5期
论文作者：宋晓岚 曲鹏 杨海平 何希 邱冠周
文章页码：536 - 541
Key words：chemical precipitation method;γ-Al2O3nanoparticles; characterization of properties
Abstract: Highly pure active γ- Al2O3 nanoparticles were synthesized from aluminum nitrate and ammonium carbonate with a little surfactant by chemical precipitation method. The factors affecting the synthesis process were studied. The properties of γ-Al2O3 nanoparticles were characterized by DTA, XRD, BET, TEM, laser granularity analysis and impurity content analysis. The results show that the amorphous precursor Al(OH)3sols are produced by using 0.1 mol/L Al(NO3) 3·9H2O and 0.16 mol/L (NH4)2CO3·H2O reaction solutions, according to the volume ratio 1.33, adding 0.024% (volume fraction) surfactant PEG600, and reacting at 40℃, 1 000 r/min stirring rate for 15 min. Then, after stabilizing for 24 h, the precursors were extracted and filtrated by vacuum, washed thoroughly with deionized water and dehydrated ethanol, dried in vacuum at 80℃for 8 h, final calcined at 800℃for 1 h in the air, and high purity activeγ-Al2O3nanoparticles can be prepared with cubic in crystal system, O7H-FD3M in space group, about 9 nm in crystal grain size, about 20 nm in particle size and uniform size distribution, 131.35 m2/g in BET specific surface area, 7 11 nm in pore diameter, and not lower than 99.93% in purity.
