화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.11, No.8, 944-951, December, 2000
Export Citation
자율적 조습재료의 제조와 그의 특성평가
Preparation and Characterization of the Humidity Self-control Materials
양진석, 곽중협1, †, 서태수1, 최청송
  • 서강대학교 화학공학과, 서울 121-742
  • 1한국화학연구소 화학소재부, 대전 305-600
Jin Suk Yang, Chung Heop Kwak1, †, Tae Soo Suh1, and Cheong Song Choi
  • Department of Chemical Engineering, Sogang University, Seoul 121-742, Korea
  • 1Korea Research Institute of Chemical Technology, Advanced Material Division, Taejon 305-600, Korea
E-mail:
초록
수용액상의 Sol-Gel 반응과 액정주형법을 이용하여 세공크기가 3.0∼7.5 범위로 제어된 mesoporous silica를 제조하고 자율적 조습재료로써의 응용에 대해 검토하였다. 수용액상의 Sol-Gel 반응에서는 pH 3.0∼5.5 범위에서 세공크기 2.8∼7.8 nm인 시료를 합성할 수 있었고 본 연구에서 고안된 역적정법에 의해 세공크기 4.0∼5.5 nm인 시료의 세공용적을 0.8 cc/g 이상, 겔점에서의 규산소다 용액의 농도를 25%이상으로 증가시킬 수 있었다. 비표면적과 세공용적은 소성온도에 반비례하였는데 내구성을 고려한 적정 소성온도는 600 ℃부근인 것으로 판단된다. 액정주형법에서는 계면활성제의 농도 25%, pH 10.0∼11.0 범위에서 세공크기 4.1∼7.0 nm, 세공용적 0.9 cc/g 이상인 시료를 합성할 수 있었는데 이 시료들은 Hexagonal 형태의 균일한 세공이 잘 발달해 있었다. 결과적으로, 수용액상의 Sol-Gel 반응과 액정주형법에 의해 제조된 시료 공히, 수증기 흡·방습량이 80%이상이고 상대습도 40∼70%범위에서 대부분의 흡·방습이 일어나는 것으로 보아 자율적 조습재료로써의 응용가능성이 매우 클 것으로 판단된다. 또한, 환경습도범위에서의 흡·방습량 비교에 의하면 수용액상의 Sol-Gel 반응시료가 보다 자율적 조습능력이 우수한 것으로 평가되었다.
Mesoporous silicas having an average pore size of 3.0∼7.5 nm have been synthesized via the aqueous sol-gel reaction and Liquid Crystal Templating (LCT). The application of the silicas as a humidity self-control material was examined. It was possible to prepare the specimens with a pore size of 2.8∼7.8 nm by the sol-gel reaction in the pH range of 3.0∼5.5. By using the back titration method, which was designed for this study, the pore volume of the specimen with a pore size of 4.0∼5.5 nm and the concentration of a sodium silicate solution at the gel-point were increased to over 0.8 cc/g and 25%, respectively. Both the surface area and the pore volume were inversely proportional to the calcination temperature. The optimal calcination temperature concerning a durability was found at around 600 ℃. In the 25% concentration of surfactant solution, by the LCT method, it was possible to prepare the specimens with a uniform hexagonal-type pore size of 4.1∼7.0 nm and the pore volume of over 0.9 cc/g in the pH range of 10.0∼11.0. Measurements of the water vapor adsorption-desorption for the specimens, prepared by the above two methods, indicated that they were over 80%. The adsorption-desorption occurred mostly at the relative humidity between 40% and 70%. In this regard, we have concluded that the specimens could be used for a humidity self-control material. In addition, the specimen yielded by the sol-gel reaction showed a superior ability of humidity self-control than the one by the LCT.
Keywords:Humidity self-control materials;Sol-Gel process;Liquid crystal templating (LCT);Mesopore;Mesoporous silica;Water vapor isotherm plot
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