This article focus on the effects of seed particles and surfactants
on the phase transformation and particle morphology of a-Al2O3.
The addictive of glucose can promote the a-Al2O3 transformed
from g-Al2O3 directly. Adding 3.5–5 wt% of a-Al2O3 powder to
aluminum isopropoxide markedly increased the phase transfor-
mation rate of g-Al2O3 to a-Al2O3. Polyvinylpyrrolidone played an
important role in reducing the particle growth and aggregation.
The ultrafine a-Al2O3 powder with high degree of homogeneity
can be prepared at 1000 C in the presence of seed, glucose and
polyvinylpyrrolidone, via this method, the particle size of the
obtained sample was less than 50 nm. Further, aluminum
isopropoxide was used as raw material, except the glucose and
polyvinyl pyrrolidone, other substances were not introduced, so
the obtained a-Al2O3 powders had high purity. This two-step
hydrolysis method is so simple and the preparation process
conditions are easy to control, so it has great potential applications
in industrial production.