Porous silica particles prepared from silicon tetrachloride using ultrasonic spray method

Silica particles having the median diameter of 1 to 3 mu m were prepared fr om silicon tetrachloride vapor by a reaction with water droplets using the ultrasonic spray method. The particle sizes of silicas were controlled by c hanging the composition of silicon tetrachloride and water. These silica pa rticles had microporous structures from nitrogen and water adsorption measu rements. The microporous and mesoporous particles were prepared from the re action of water droplets including sodium and potassium carbonates with sil icon tetrachloride vapor. (C) 1999 Academic Press.