Abstract
Amorphous titania particles (10–12 μm in diameter) prepared by oxidation of metallic Ti in an aqueous solution of H2O2 and ammonia werefound to be porous agglomerates of 0·25 × 0·08 μm rodlike particles having a finer internal structure. The thermal treatment of the particles in CCl4 can produce single crystal particles (10 nm in diameter) with no internal structure. This is thought to be due to the presence of CCl4 in a supercritical state, and steric inhibition of CCl4 between the primary particles during the treatment.
MST/3072
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