Low temperature synthesis of nano alpha-alumina powder by two-step hydrolysis

作者：Yan, Ting; Guo, Xiaode^*; Zhang, Xiang; Wang, Zhixiang; Shi, Jinqiu

来源：Materials Research Bulletin, 2016, 73: 21-28.

DOI：10.1016/j.materresbull.2015.08.021

• Nanostructures
• Oxide
• Chemical synthesis
• Phase transitions
• X-ray diffraction

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.

• 出版日期2016-1
• 单位南京理工大学