METHOD FOR COATING SURFACE OF FINE PARTICLE

摘要

PURPOSE:To form a uniform and dense layer comprising superfine particles on the surface of fine particles by allowing alcohol to be present in the process of effecting local hydrolysis of an org. alkoxide on the surface of the fine particles to form a metal oxide layer thereon. CONSTITUTION:In the process of coating the surface of fine particles, fine particles with water adsorbed to the surface are dispersed in a hydrophobic org. solvent containing addition of small amt. of alcohol and amines as required. Then a hydrophobic org. solvent containing 0.2-15wt.% metal alkoxide dissolved therein is added to the dispersion liquid to cause local hydrolysis of the metal alkoxide on the particle surface. Thus, a dense layer of metal oxide fine particles can be formed.