Morphological control of {alpha}Al{sub 2}O{sub 3} particles precipitated from 1,4-butanediol solution
- Univ. of Florida, Gainesville, FL (United States)
Reaction conditions to control the particle shape of {alpha}-alumina are described. Synthesis variables such as reaction time, stirring speed, amount of methanol, and solid loading have an effect on the size and shape of {alpha}-alumina synthesized in 1,4-butanediol solutions. {alpha}-Alumina synthesized at longer reaction times have larger size ({approx}2-3{mu}m) and habit modifications on the edges of the plate-shaped particles. A high stirring speed promotes the formation of large hexagonal platelets ({approx}6-7{mu}m) with high aspect ratio whereas a low stirring speed promotes the formation of more isotropic polyhedra with 14 faces ({approx}2-3{mu}m). Also, {alpha}-alumina particles synthesized with methanol have a hexagonal platy habit in the form of a rhombic dodecahedra whereas {alpha}-alumina particles synthesized without methanol have near-uniform hexagonal plate shapes. Finally, increasing the solid loading changes the particle size of {alpha}-alumina from 2-3{mu}m to 6-7{mu}m. The results of this study indicate that it is possible to control the morphology of synthesized {alpha}-alumina particles by controlling the process conditions and theoretical predictions of crystal shapes can be reconciled to the morphology of the experimentally synthesized particles.
- OSTI ID:
- 181785
- Report Number(s):
- CONF-940416--
- Country of Publication:
- United States
- Language:
- English
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