单分散γ-Al2O3纳米颗粒制备工艺参数的调控

摘要

采用均相沉淀法,在950℃煅烧碱式硫酸铝(Al(SO4)x(OH)y)纳米颗粒2h,制备出单分散的γ-Al2O3纳米颗粒.研究了阴离子、浓度和沉淀剂/铝盐摩尔比对Al(SO4)x(OH)y颗粒的形貌、尺寸和分散性的影响.结果表明,Al(SO4)x(OH)y颗粒的最佳制备条件为:二甲胺硼烷(DMAB)作沉淀剂、Al2 (SO4)3.18H2O作铝源、[AP+]=0.0005mol/L、n(DMAB)(Al2 (SO4)3·18H2O) =40.制备出的Al(SO4)x(OH)y具有球形、平均颗粒尺寸为98nm、粒径分布为75～130nm、单分散性的特点;获得了球形、平均颗粒尺寸为90nm、粒径分布范围为50～105nm、单分散的γ-Al2O3颗粒.%A homogeneous precipitation route was used to prepare aluminum basic sulfate nanoparticles.Monodisperse γ-Al2O3 nanoparticles were then obtained by 2 hrs calcining the aluminum basic sulfate nanoparticles at 950℃.Effects of anion,concentration and molar ratio of precipitator/aluminium salt on the shape,size and dispersibility of aluminum basic sulfate particles were studied.Results show that the optimal preparation condition of aluminum basic sulfate particles is as follows:dimethylamine broane as precipitator and aluminium sulphate ocatadecahydrate as aluminum source,molar ratio of both is 40,and concentration of aluminium ion is 0.0005mol/L.Spherical aluminum basic sulfate particles have an average diameter of about 98nm,a narrow size distribution from 75 to 130nm and no agglomeration.γ-Al2O3 nanoparticles with a spherical shape,an average size of 90nm,a narrow size distribution from 50 to 105nm and monodispersity have been obtained.