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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Flexible Metal-Organic Framework with Hydrophobic Pores

2012년 2월 23일 20시 23분 36초
INOR.P-260 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
Xie Lin-Hua, 백명현1
서울대학교 화학부, China
1서울대학교 화학부, Korea

In recent years, metal-organic frameworks (MOFs) have been intensively studied as a new type of porous materials due to their promising application potential for gas storage and separation, chemical sensor, catalysis, fabrication of metal nanoparticles, etc. An obstacle for their applications is moisture sensitivity of the porous frameworks. Here, we present a new MOF with one-dimensional channels with a diameter of about 6.5-7.0 angstroms lined by the hydrophobic tert-butyl groups. After activation with supercritical CO2, PXRD patterns revealed that the structure was severely shrunken. Gas sorption studies revealed that the activated compound was able to adsorb most common gases (N2, O2, CO2, H2 and CH4). In particular, stepwise adsorption and hysteretic desorption behaviors, which must be related with the breathing effect of the framework, were observed for N2, O2 and CO2 gases. However, no water uptake was observed even under the saturated water-vapor pressure at room temperature. PXRD patterns also indicated that this hydrophobic material was stable even after exposure to saturated water vapor or immersion in liquid water for a week. In contrast, the as-synthesized phase turned to be amorphous shortly after being immersed in water. Besides, Grand Canonical Monte Carlo simulations for water adsorption for framework of the as-synthesized phase revealed the presence of hydrophilic sites on its pore surface. These results demonstrated that the structural shrinkage of the framework upon guest removal profoundly changed the pore surface and enhanced its hydrophobicity.