非水介质中制备纳米Al_2O_3的研究

Preparation Al_2O_3 Nanoparticles in Non-aqueous Solution

以Ch3(CH2)16COOH为分散剂和反应剂,探讨了采用溶胶凝胶法制备纳米Al2O3的条件.研究了反应温度、反应时间、摩尔比等因素对粒径和转化率的影响,并取得了最佳工艺条件.用X射线衍射(XRD)、透射电镜分析(TEM),对实验所得粉末的结构和性能进行了表征.结果表明,Al(NO3)3和CH3(CH2)16COOH的摩尔比控制在1∶4,于90℃反应50 min,分别在800℃和1200℃煅烧2 h,得到了纤维状和球状的Al2O3粉末,其平均粒径分别为36.2 nm和125.6 nm,且分散性很好.

The condition of preparing nanometer Al2O3 powder in the stearic acid gel method was researched. Not only the influences of reaction temperature and time, raw materials ratio on products yield, but also the best condition was obtained. TEM, XRD were used to characterize the particle shape and phase and size distribution. XRD and TEM show that the powder is fibrous γ-Al2O3 in 800℃ and spherical α-Al2O3 in 1 200℃. The grain-testing structure shows that average particle diameter of γ- Al2O3 is 36.2 nm while that of α-Al2O3 is 125.6 nm.