물유리로부터 투광성 실리카 에어로젤 모노리스의 상압건조 기술의 개발

초록

Hydrophobic silica aerogels were synthesized by ambient pressure drying method from silicic acid with a different pH value which was prepared from sodium silicate solution (water glass). In this study we chose various hydrocarbon class solvents such as pentane, hexane, heptane and toluene, and performed surface modification in TMCS (trimethylchlorosilane)/ solvent solutions in order to improve reproducibility in aerogel production. Densities of the aerogels were about 0.1 ~ 0.3 g/cm3 and apparent porosities were 88 ~ 96 %, depending on processing conditions. Specific surface area was approximately 730 ~ 950 m2/g and average pore size were around 10 nm.