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홍인권,이재동,김원일,Kim, Hyung Jin,이승문 한국공업화학회 2001 응용화학 Vol.5 No.2
The commercial applications of the aerogel are such as catalysts, thermal insulation, particle detectors. In addition to growing commercial application of aerogel, there are also scientific and technical applications. In this study, wet gels were prepared by a sol-gel process using titanium(IV) chloride (TiCI₄) and the resulting aerogels were obtained by supercritical drying process of wet gels. The resulting gels were converted to xerogels, aerogel and sonogel by atmospheric drying, supercritical drying and ultrasonic extraction, respectively. The amount of solvent and propylene oxide were varied in the range of 67 to 1600 ㏖ and 16 to 239.7 ㏖ in the resulting gels. The gel time increased as amount of solvent but decreased as amount of propylene oxide.
초임계 이산화탄소를 이용한 다공성 Silicone Rubber 의 제조
이승범,김형진,홍인권 ( Seung Bum Lee,Hyung Jin Kim,In Kwon Hong ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.4
Since supercritical fluid has the benefit that slight changes in the temperature and pressure in the critical region cause extremely large change in the solvent density and thus its dissolving power, its application has been enlarged. In this study, calcium carbonate(CaCO₃) particles impregnated in silicone rubber network were extracted by using supercritical carbon dioxide and pore distribution of silicone tubber-CaCO₃ was investigated with varying amount of extract. Silicone rubber has excellent mechanical properties such as heat-resistance, cold-resistance. Silicone rubber-CaCO₃ composite sheets were prepared by kneading processes. And then CaCO₃ particles become dispersed and impregnated in silicone rubber network. Supercritical carbon dioxide diffuse through composite sample, then sample is swollen. CaCO₃ in silicone rubber network is dissolved in supercritical carbon dioxide, and its sites become pores. Pore distribution and pore shape are observed by SEM(scanning electron microscope). Porous silicone rubber is suited for uses such as chromatographic devices, catalytic membranes, and adsorbents of organics.