| Title |
Preparation of ultrafine SiO2 Particles by Microemulsion Method |
| Authors |
조수행(S . H . Cho); 고명한(M . H . Ko); 도재범(J . B . Doh); 원창환(C . H . Won); 강용(Y . Kang); 천병선(B . S . Chun) |
| Abstract |
The ultrafine particles of relatively pure SiO₂ were prepared by means of a water/isooctane/ AOT microemulsion system. The reactant added to the microemulsion system was tetraethoxysilane and the aqueous solution of ammonia was also added to adjust the PH of the micoremulsion system. The SiO₂ particles precipitated in a microemulsion reactor was dried and then calcined properly in order to obtain ultrafine SiO₂ powders. The condition of drying and calcination process was found to influece the purity of final product. The SiO₂ powders prepared in this way(especially water-in-oil microemulsion) had substantially increased number of micropores in them compared to the powders prepared by other methods. The combination of materials forming the microemulsion system was also found to influence the size and porosity of SiO₂ powders as well as the stability of microemulsion systems. |