• 제목/요약/키워드: Carbon-silica membrane

검색결과 24건 처리시간 0.016초

Carbon-Silica Membranes Derived from Polyimide/Silica Composites for Gas Separation

  • Lee, Young-Moo;Park, Ho-Bum;Kim, Myung-Jun;Jang, Jeong-Gyu
    • 한국막학회:학술대회논문집
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    • 한국막학회 2003년도 The 4th Korea-Italy Workshop
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    • pp.47-50
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    • 2003
  • Carbon-silica membranes were Prepared by Pyrolyzing polyimide/silica composite obtained from ill-situ polymerization of alkoxy silanes via sol-gel reaction. In this study, effects of silica content and silica network in polyimide matrix were focused on the gas permeation and separation properties of the final carbon-silica membrane. The membranes prepared were characterized with a field emission scanning electron microscopy (FE-SEM), a solid state $^{29}$ Si nuclear magnetic resonance spectroscopy ($^{29}$ Si-NMR), an electron spectroscopy for chemical analysis (ESCA), a thermogravimetric analysis (TGA) and gas permeation tests.

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탄소-실리카막을 이용한 기체분리 (Carbon-Silica Membrane for Gas Separation)

  • Lee, Young-Moo;Park, Ho-Bum
    • 한국막학회:학술대회논문집
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    • 한국막학회 2004년도 첨단 분리막 연구동향
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    • pp.77-102
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    • 2004
  • Carbon materials obtained from organic polymers are usually amorphous structure. The structure of carbon materials is not nearly as well defined as that of zeolite. Carbon are amorphous materials with comparatively wide pore size distribution as compared to the crystalline zeolites with monodisperse ultramicropore and micropore dimensions. (omitted)

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Fabrication of High Permeable Nanoporous Carbon-SiO$_2$ Membranes Derived from Siloxane-containing Polyimides

  • Kim, Youn Kook;Han, Sang Hoon;Park, Ho Bum;Lee, Young Moo
    • Korean Membrane Journal
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    • 제6권1호
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    • pp.16-23
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    • 2004
  • The silica containing carbon (C-SiO$_2$) membranes were fabricated using poly(imide siloxane) (PIS) having -CO- swivel group. The characteristics of porous C-SiO$_2$ structures prepared by the pyrolysis of poly(imide siloxane) were related with the micro-phase separation between the imide block and the siloxane block. Furthermore, the nitrogen adsorption isotherms of the CMS and the C-SiO$_2$ membranes were investigated to define the characteristics of porous structures. The C-SiO$_2$ membranes derived from PIS showed the type IV isotherm and possessed the hysteresis loop, which was associated with the mesoporous carbon structures, while the CMS membranes derived from PI showed the type I isotherm. For the molecular sieving probe, the C-SiO$_2$ membranes pyrolyzed at 550, 600, and 700$^{\circ}C$ showed the O$_2$ permeability of 924, 1076, and 367 Barrer (1 ${\times}$ 10$\^$-10/㎤(STP)cm/$\textrm{cm}^2$$.$s$.$cmHg) and O$_2$/N$_2$ selectivity of 9, 8, and 12.

극저농도 NDMA(N-nitrosodimethylamine) 물리적/생물학적 처리 효율 비교 평가 (Evaluation and Comparative Physical/Biological Removal Performance for Extremely Low-Concentration NDMA(N-nitrosodimethylamine))

  • 박세용;김희주;김문일
    • 한국지반환경공학회 논문집
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    • 제12권2호
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    • pp.55-61
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    • 2011
  • NDMA(N-Nitrosodimethylamine)는 극저농도(10ng/L)에서도 암을 일으킬 수 있는 물질로 알려져 있지만, 기존의 NDMA 제거율 평가 연구는 고농도의 NDMA를 대상으로 한 것이 대부분이었다. 따라서 극저농도의 NDMA 제거효율 평가가 필요하며 그 기초연구로써 호기성/혐기성 조건에서의 분말활성탄, GS(Granular Sludge), MF(Microfiltration), UF(Ultrafiltration)를 이용한 제거효율과 Silica gel(MCM-41, Diatomite, Spherical silica gel)을 이용한 제거효율을 평가하였다. 그 결과 혐기성 조건에서 GS, PAC를 접촉한 후 UF membrane을 이용한 고액분리가 65%의 제거율로 가장 높았으며, Silica gel(MCM-41)이 6%의 제거율로 가장 낮았다. 본 연구는 극저농도의 NDMA 제거의 기초 연구로서 향후 관련 연구의 기초자료로써 활용을 기대한다.