• 제목/요약/키워드: Carbon Membrane

검색결과 767건 처리시간 0.021초

CONTROL OF CARBON DIOXIDE REMOVAL RATE BY HOLLOW FIBER MEMBRANE CONTACTOR

  • Lee,Yong-Taek;Cho, Ingi;Lim, Hye-Jin;Ahn, Hyo-Seong;Hahm, Moon-Ky;Park, You-In;Lee, Kew-Ho
    • 한국막학회:학술대회논문집
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    • 한국막학회 1999년도 The 7th Summer Workshop of the Membrane Society of Korea
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    • pp.48-51
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    • 1999
  • To investigate numerically the removal behavior of carbon dioxide in a hollow fiber membrane contactor, the system controlling equations were developed including the nonlinear reversible reaction terms. The reversible chemical reactions were incorporated in the system controlling equations, resulting in the coupled nonlinear partial differential equations which could describe either the absorption of the desorption of carbon dioxide. The computer program was coded using the Fortran language and run with a personal computer to find out the effects of the system variables: the pressures of absorbed and desorbed gases, the absorbent flow rate, the concentration of potassium carbonate, the fiber diameter and the length.

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Dynamics of C60 Molecules in Biological Membranes: Computer Simulation Studies

  • Chang, Rak-Woo;Lee, Ju-Min
    • Bulletin of the Korean Chemical Society
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    • 제31권11호
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    • pp.3195-3200
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    • 2010
  • We have performed molecular dynamics simulations of atomistic models of $C_{60}$ molecules and DMPC bilayer membranes to study the static and dynamic effects of carbon nanoparticles on biological membranes. All four $C_{60}$-membrane systems were investigated representing dilute and concentrated solutions of $C_{60}$ residing either inside or outside the membrane. The concentrated $C_{60}$ molecules in water phase start forming an aggregated cluster. Due to its heavy mass, the cluster tends to adhere on the surface of the bilayer membrane, hindering both translational and rotational diffusion of individual $C_{60}$. On the other hand, once $C_{60}$ molecules accumulate inside the membrane, they are well dispersed in the central region of the bilayer membrane. Because of the homogeneous dispersion of $C_{60}$ inside the membrane, each leaflet is pushed away from the center, making the bilayer membrane thicker. This thickening of the membrane provides more room for both translational and rotational motions of $C_{60}$ inside the membrane compared to that in the water region. As a result, the dynamics of $C_{60}$ inside the membrane becomes faster with increasing its concentration.

산소/질소 분리를 위한 다층구조 제올라이트 5A를 함유한 탄소분자체 분리막 제조 (Hierarchical 5A Zeolite-Containing Carbon Molecular Sieve Membranes for O2/N2 Separation)

  • 리웬;추아총양;배태현
    • 멤브레인
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    • 제30권4호
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    • pp.260-268
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    • 2020
  • 다층 구조를 가진 5A 제올라이트를 탄소 분자체 분리막에 첨가한 복합막을 제조하고 질소/산소의 분리 특성을 평가하였다. 제올라이트의 첨가는 선택도에는 미세한 영향을 주지만 투과도를 크게 증가시키는 방법으로 전체적인 탄소막의 질소/산소의 분리 성능을 상승시켰다. 특히 메조포어를 함유한 다층구조의 제올라이트 첨가제는 분리막의 투과도를 보다 효율적으로 상승시켜 아주 우수한 분리 성능에 도달하였다. 이 연구의 결과는 저렴한 탄소막 전구체와 제올라이트 소재를 활용하고도 고성능의 질소/산소 분리막을 손쉽게 제조할 수 있다는 것을 제시한다.

Carbon Corrosion at Pt/C Interface in Proton Exchange Membrane Fuel Cell Environment

  • Choi, Min-Ho;Beom, Won-Jin;Park, Chan-Jin
    • Corrosion Science and Technology
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    • 제9권6호
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    • pp.281-288
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    • 2010
  • This study examined the carbon corrosion at Pt/C interface in proton exchange membrane fuel cell environment. The Pt nano particles were electrodeposited on carbon substrate, and then the corrosion behavior of the carbon electrode was examined. The carbon electrodes with Pt nano electrodeposits exhibited the higher oxidation rate and lower oxidation overpotential compared with that of the electrode without Pt. This phenomenon was more active at $75^{\circ}C$ than $25^{\circ}C$. In addition, the current transients and the corresponding power spectral density (PSD) of the carbon electrodes with Pt nano electrodeposits were much higher than those of the electrode without Pt. The carbon corrosion at Pt/C interface was highly accelerated by Pt nano electrodeposits. Furthermore, the polarization and power density curves of PEMFC showed degradation in the performance due to a deterioration of cathode catalyst material and Pt dissolution.

탄소중립을 위한 고분자 기체분리막의 기술 동향 (Technological Trends in Polymer Gas Separation Membrane for Carbon Neutrality)

  • 칼리드 무하머드 타이얘브;박철호
    • 멤브레인
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    • 제34권3호
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    • pp.172-181
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    • 2024
  • 대부분의 국가들은 온실가스 배출량을 줄이고 기후변화에 적응하기 위한 행동계획인 NDC (National Determined Contribution)를 법률화 했다. NDC 목표 달성을 위해 다양한 기술이 개발되고 있으며, 특히 가스상의 온실가스나 에너지원의 정화를 위해 분리막 수요가 증가하고 있다. 따라서, 본 논문은 다양한 재료 중 실현 가능한 제조 공정과 쉬운 스케일업의 장점을 가지고 있는 고분자 막의 기술 동향을 제공할 것이다.

공기 분리용 열분해 탄소막 (Pyrolytic Carbon Membranes for Air Separations)

  • Singh, Anshu;Koros, W.J.
    • 멤브레인
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    • 제7권1호
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    • pp.15-21
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    • 1997
  • Carbon molecular sieve (CMS) membranes were synthesized by the pyrolysis of polymeric precursors. The CMS materials had oxygen-nitrogen selectivities much higher than those observed for the polymeric precursors. Typically molecular sieving materials have diffusion selectivities much higher than polymeric materials. This has been identified as a result of higher entropic selectivity of the molecular sieving materials. A study of the development of molecular sieving properties as the polymeric precursor is pyrolyzed into a CMS material will offer us an insight into polymeric molecular structures needed for enhanced entropic selectivity membrane materials.

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Carbon Molecular Sieve Membranes Dispersed with Nano Particles

  • H.Suda;Ha, K.raya
    • 한국막학회:학술대회논문집
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    • 한국막학회 2004년도 Proceedings of the second conference of aseanian membrane society
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    • pp.183-186
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    • 2004
  • Nano particles-containing CMS membranes were prepared by pyrolysis of polyimides dispersed uniformly with precursors and their gas separation performances were examined, to elucidate the permeation mechanism and to further improve the gas separation performance. Consequently, it was suggested that the separation performance could be controlled by doping nano-particles in the CMS membranes, and that optimization of various factors, such as the size, content, and dispersion state of the nano particles would contribute for further improvement of the gas separation performance.

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양자점이 합체된 복합 박막을 이용한 정수의 최근 발전 (Recent Progress in Qantum Dots Containing Thin Film Composite Membrane for Water Purification)

  • 박신영;라즈쿠마 파텔
    • 멤브레인
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    • 제30권5호
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    • pp.293-306
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    • 2020
  • 물 부족을 포함한 기후 변화의 해로운 결과는 효과적인 정수에 대한 관심을 가져왔다. 또한, 수질 오염 수준이 높아지고 환경 파괴 수준이 심해지면서 오염 물질을 제거하려는 방안들이 요구되고 있다. 물을 정화하기 위해 반투막을 통한 삼투압 절차들을 사용할 수 있으며, 최근 연구에 따르면 탄소 양자점(CQD), 그래핀 양자점(GQD) 및 산화 그래핀 양자점(GOQD)을 포함한 나노입자를 복합 박막(TFC)에 합체하면 유사한 수준의 염 거부율을 유지하면서 물흐름을 증가시킬 수 있다. 이러한 효과 외의 여러 가지 효과가 있지만 그 중에서도 친수성을 높이고, 살균 성질을 보이고, 방오 특성으로 인해 박테리아 및 기타 미생물의 축적을 방지하면서 막의 효과가 감소하는 것을 막는 것을 보여준다. 이 보고서는 양자점이 합체된 정수용 복합 막에서 양자점의 제조 과정, 응용, 기능성, 성질 및 역할을 논의한다.