상압건조 나노다공성 실리카 에어로젤에 대한 개질제 효과

Abstract

Nanoporous silica aerogels with various surface modifiers were prepared by ambient drying process. Tetraethylortho-silicate (TEOS) were used a raw material. Ambient drying process for various surface modifier was studied in the pointof view of a crack-free monolith and thin films and low cost. Various kinds of surface modifiers like as hexamethyl-disilazane (HMDSZ), trimethlychlorosilane (TMCS), methlytriethoxylsilane (MTES), and methlytrimethoxysilane (MTMS)were studied in order to enhance hydrophobicity for the silica aerogel. Surface modified aerogels were evaluated by FT-IR, TG, BET, SEM and wetting angle measurement. Homogeneous and crack-free aerogels were obtained by modifyingthe HMDSZ and the TMCS. However silica xerogel was obtained when modified with MTMS, MTES.