The Preparation of Alumina Nanopowders from Solution Derived Precipitates through Polymer Gel Method
Non-aggregated nanoscale α-Al2O3 powders with average size ranging from 7 to 20 nm were prepared successfully at various conditions with the use of the hydrated aluminum sulfate extracted from kaolin by polyacrylamine (PAA) gel method. The calcination temperature was relatively lower about 100°C, compared to conventional solid-state reaction. It revealed that PAA worked as a chelating agent to disperse the Al3+ ions homogeneously, and the size of alumina nanoparticles could be controlled by varying the concentration of crosslinking agent.
Wei Pan and Jianghong Gong
J. K. Kim et al., "The Preparation of Alumina Nanopowders from Solution Derived Precipitates through Polymer Gel Method", Key Engineering Materials, Vols. 336-338, pp. 2047-2050, 2007