材料科学
差示扫描量热法
热重分析
煅烧
聚乙烯吡咯烷酮
扫描电子显微镜
化学工程
傅里叶变换红外光谱
透射电子显微镜
粒径
核化学
分析化学(期刊)
矿物学
化学
纳米技术
复合材料
有机化学
催化作用
高分子化学
工程类
物理
热力学
作者
Ting Yan,Xiaode Guo,Xiang Zhang,Zhixiang Wang,Jinqiu Shi
标识
DOI:10.1016/j.materresbull.2015.08.021
摘要
The ultral fine alpha-alumina powder has been successfully synthesized via two-step hydrolysis of aluminum isopropoxide. Glucose and polyvinyl pyrrolidone were used as surfactants during the appropriate processing step. The alpha-alumina powder was used as seed particles. Several synthesis parameters, such as the amount of seeds, surfactants, and calcination temperature, were studied by X-ray diffraction (XRD), Fourier transform infrared spectra (FTIR), Thermogravimetry-differential scanning calorimetry (TG-DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The experimental results showed that glucose greatly lower the phase transformation temperature of alpha-alumina by impelling the gamma-alumina transformed to alpha-alumina directly, and the seed could improve the phase transformation rate of alpha-alumina, the polyvinylpyrrolidone have an effect on preventing excessive grain growth and agglomeration of alpha-alumina powder. Comparatively well dispersed alpha-alumina powder with particle size less than 50 nm can be synthesized through this method after calcinations at 1000 °C for 2 h.
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