γ-Fe2O3纳米粒子的(湿)固相研磨法制备研究

在聚乙二醇(PEG-400)存在下,于室温下研磨适量FeCl3与NaOH的混合物制备了γ-Fe2O3纳米粒子.所得各样品用XRD,Mossbauer谱,TEM,Tg-DTA和FTIR等手段进行了表征.结果表明,研磨后的样品经60℃干燥2h后即可得结晶较差的γ-Fe2O3纳米粉体,经450℃热处理1h后得粒径约为30nm结晶较好的γ-Fe2O3纳米粒子,经500℃热处理1h后得到粒径约为40nm、结晶完好的γ-Fe2O3纳米粒子.

Preparation of γ-Fe2O3 Nanoparticles by Solid(wet)-phase Grinding

In this paper, a new method to prepare γ Fe2O3 nanoparticles was described. In the presence of polyethylene glycol(PEG 400), the mixture of FeCl3·6H2O and NaOH was ground and the γ Fe2O3 nanoparticles were prepared. The product obtained was washed and dried at 60 ℃ and calcined at different temperatures for 1 h. XRD, Mssbauer Spectroscopy, TEM, TG DTA and FTIR were used to characterize the samples. The results show that after dried at 60 ℃ for 2 h, the as ground sample was transformed into poor crystalline γ Fe2O3 ultrafine powder. After being calcined at 450 ℃ for 1 h, the ultrafine powder became good crystalline γ Fe2O3 nanoparticles with particle size of 30 nm. After being calcined at 500 ℃ for 1 h, perfect crystalline γ Fe2O3 nanoparticles were gotten with a particle size of 40 nm.