PREPARATION OF ULTRAFINE HOLLOW MICROSPHERE OF METALLIC OXIDE

摘要

PURPOSE:To obtain the titled spheres having sharp particle size distribution, in high efficiency, by applying ultrasonic radiation to a solution of a metallic compound, and heating and calcining the produced ultrafine droplets (mist partices). CONSTITUTION:A metallic compound [e.g. tetramethoxysilane, dihydroxybis (lacto)-titanium, etc.] is dissolved in water, alcohol, ketone, etc. The obtained solution of the metallic compound is irradiated with ultrasonic radiation of about 0.8-1.7MHz in frequency, and the produced ultrafine droplets (mist) are introduced together with a carrier gas (air) into the calcination furnace, and calcined at about 600-1,800 deg.C for about 0.5-2sec. The product is collected under cooling to obtain he objective ultrafine hollow spheres of a metallic oxide (e.g. silicon oxide, titanium oxide, etc.).