关键词: &alpha, -氧化铝, 单分散纳米颗粒, 高分子网络法, 炭隔离

Abstract: In order to get the stable α-Al₂O₃ phase，Al₂O₃ needs to go through a high-temperature phase transformation.In the preparation process of α-Al₂O₃ nanoparticles by polymer network method，the agglomeration of alumina particles can be prevented by a high-temperature isolation phase，and thus high quality monodispersed α-Al₂O₃ nanoparticles can be prepared. Monodispersed α-Al₂O₃ nanoparticles were obtained by using carbon as an isolation phase based on a polymer network method. Experiment method：the network agents，2-acrylamide and N，N-dimethyl acrylamide，as well as initiator，ammonium persulfate，were put into aluminium nitrate water solution.Taking the advantage of the polymerization of free radicals of 2-acrylamide and of bifunctional effect of two active double-bonds of N，N-dimethyl acrylamide molecules，the polymer chains were bound to network.Then the dry gel was formed through water bath polymerization and drying.Aluminium nitrate was dispersed in the gel evenly，and finally the high dispersed α-Al₂O₃ nanoparticles with diameter about 10 nm were obtained after high temperature carbonization，crushing，high temperature phase transformation，carbon removing，and centrifugal washing etc.

Key words: α-Al₂O₃, monodispersed nanoparticles；polymer network method；carbon isolation