상압건조 물유리 에어로젤에 대한 표면개질제의 영향
Surface modifiers on the waterglass aerogels prepared byambient drying process
1
조회
0
다운로드
2
인용
0
참고문헌
초록
Abstract
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
참고문헌 (6)
- A. R. Buzykaeb, "Measurement of optical parameters of aerogel", 433, pp.396~400 (1999)
- L. Kocon, "Ultralow density silica aerogels by alcohol supercritical drying", 220, pp.96~100 (1998)
- J. A. M. Mcdonnell, "position-sensitive impact sensor", 25, pp.315~322 (2000)
- S. S. Kistler, "Coherent expanded aerogels and jellies", 127, pp.741~744 (1931)
- F. Schwertfeger, "Hydrophobic waterglass based aerogels without solvent exchange of supercritical drying", 225, pp.24~29 (1998)
- H. S. Yang, "Synthesis of silica aerogel and thin film coating at ambient pressure", 34, pp.188~194 (1997)