김태정 남산 오영제 2024-01-21T03:03:01Z 2024-01-21T03:03:01Z 2021-09-06 2006-06 1225-5475 https://pubs.kist.re.kr/handle/201004/135461 Silica aerogel with ultra low density and high porosity has been focused on versatile application due to its fascinating properties. Ambient drying process of waterglass, in this study was researched to fabricate a crack-free monolith body in the point view of cost effective way. Wet gel was obtained by removing of Na+ ions in waterglass, which contains 8wt% of SiO2. Xylene, which has a low vapor pressure, was used as a solution substitutor to prevent the formation a cracks during drying. Various surface modifiers like as hexamethyldisilazane (HMDSZ), trimethylchlorosilane (TMCS), methyltriethoxylsilane (MTES), methyltrimethoxysilane (MTMS) and phenyltriethoxysilane (PTES) were used in order to improve hydrophobicity of the waterglass Silica aerogel. Some physical properties of the surface modified aerogels were investigated by FT-IR, TGA, BET and SEM. Hydrophobicity and hydrophilicity of Silica aerogel is attributed to the Si-OH bond and the non-polar C-H bond groups on the surface of aerogel. Crack-free waterglass aerogel with >90% of porosity, 17nm of pore size and <0.15g/cm3 of density was prepared. HMDSZ and TMCS are effective as a surface modifier 한국센서학회 상압건조 물유리 에어로젤에 대한 표면개질제의 영향 Surface modifiers on the waterglass aerogels prepared byambient drying process Article 2 센서학회지, v.15, no.3, pp.173 - 178 센서학회지 15 3 173 178 kci ART001009652 aerogel waterglass ambient drying surface modifier HMDSZ TMCS aerogel waterglass ambient drying surface modifier HMDSZ TMCS