나노세공 실리카 분말의 합성과 열적 특성에 관한 연구

Abstract

Silica hydrogel was synthesized by the reaction of liquid sodium silicate with sulfuric acid. The condensation polymerization of the synthesized hydrogel was carried out via an aging process under the acidic or alkaline conditions. Nano porous silica with the pore size below 3 nm and surface area of 715 ㎡/g, was obtained by the above processes in acidic ranges(pH = 3~5). The pore size and surface area of the silica varied with pH, and in alkaline ranges(pH = 8~10), those were 21 nm and 300 ㎡/g respectively. The characteristics of the silica varied with the thermal treatment which caused the change of surface area, pore volume and pore diameter.