Acta Phys. -Chim. Sin. ›› 1998, Vol. 14 ›› Issue (02): 142-146.doi: 10.3866/PKU.WHXB19980209

• ARTICLE • Previous Articles     Next Articles

Effect of Different Drying Methods on the Properties of TiO2 Particles

Dong Guo-Li, Gao Yin-Ben, Chen Song-Ying   

  1. State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001
  • Received:1997-05-23 Revised:1997-09-15 Published:1998-02-15
  • Contact: Dong Guo-Li

Abstract:

The effects of different drying methods on the properties of TiO2 powders have been studied. Usually in the case of conventional drying, various forces mainly in the form of capillary press cause differential macroscopic and microscopic shrinkage and the gel structure cracks, so the specific surface areas and pore volumes are small for hydrogel or alcolgel prepared. The supercritical fluid drying (SCFD) can eliminate any liquid-vapor interface inside the gel during solvent extraction. so avoiding the macroscipic or microscopic collapse and preserving the structure of the wet gel. so the specific surface areas and pore volumes of aerogel botaied has the largest values.
These ultrafine powders prepared by the supercritical drying have reproductive high surface areas and large pore volumes.

Key words: Supercritical fluid drying, Convertional drying, TiO2, Ultrafine particle