Abstract
Fine alumina powders have been synthesised by a homogeneous precipitation of aluminium sulphate by urea in water-glycerol, water-ethylene glycol and in pure water, followed by thermal decomposition of the hydroxide at 600°C. Alumina powder was also prepared by the conventional ammonia method for comparison. The powders were characterised by their particle size distribution, BET surface area, tap density and particle morphology (SEM). Point of zero charge of the powder was determined by the potentiometric method. The surface areas ranged from 43 m2/g to 105·5 m2/g, the particle size less than 0·5 micron from 50% to 12% and the point of zero charge from 7·05 to 7·85. The precipitation medium has been shown to have profound influence on the particle characteristics as well as on the surface charge of fine aluminium oxide powders.
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