Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10624724 | Ceramics International | 2015 | 27 Pages |
Abstract
We developed the polyol synthesis of γ-alumina particles that allows for control of their particle size from the nanometer level to the micrometer level. The developed polyol synthesis utilized a reflux reaction of ethylene glycol solution with aluminum nitrate hexahydrate and poly(vinylpyrrolidone) (PVP). Two important process parameters - the molecular weight of PVP and refluxing temperature - were investigated to control the size of the alumina particles. Further, two growth models for amorphous alumina particles in polyol synthesis were suggested. γ-Alumina with secondary particle size ranging from 142 nm to 1.0 μm with a specific surface area ranging from 81 to 32 m2/g was obtained. The α-alumina prepared by high-temperature annealing of over 1200 °C had secondary particle sizes ranging from 246 to 330 nm, but with specific surface areas of only 5.4-11 m2/g. Therefore, it is proved that the polyol synthesis is able to control secondary particle size of γ-alumina upon maintaining a large specific surface area.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Toshio Itoh, Toshio Uchida, Ichiro Matsubara, Noriya Izu, Woosuck Shin, Hiroshi Miyazaki, Hiromasa Tanjo, Keisen Kanda,