공비혼합물로 제조된 다공성 센서재료용 실리카 에어로젤
Silica aerogels for potential sensor material prepared by azeotropic mixture
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Abstract
Ambient drying sol-gel processing was used for monolithic silica ambigels in the temperature range of 130-250 °C.A new method of mesopore ambigels, which mean the aerogels prepared by ambient presure drying process synthesis,is suggested at first. This method includes two important approaches. The first point is that SiO2 surface modificationof wet gel was performed by trimethylchlorosilane in n-butanol solution. This procedure is provided the silica gel mesoporestructure formation. The second point is a creation of the ternary azeotropic mixture water/n-butanol/octane as porousliquid, which is effectively provided removing of water such a low temperature by 2 step drying condition under ambientpresure. The silica aerogels, which were prepared by ambient presure drying from azeotropic mixture of water/n-butanol/octane, are transparent, crack-free and mesoporous (pore size ~ 5.6 nm) with surface area of ~ 923 m2/g, bulk densityof 0.4 g/cm3 and porosity of 85 %.
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