Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Microstructural Changes during Activation Process of Isotopic Carbon Fibers using CO2 Gas(II)-TEM Study

이산화탄소를 이용한 등방성 탄소섬유의 활성화과정 중 발생하는 구조변화(II)-TEM을 이용한 분석

  • Roh, J.S. (School of Advanced Materials and Systems Engineering, Kumoh National University of Technology)
  • 노재승 (금오공과대학교 신소재공학부)
  • Published : 2003.11.01
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Abstract

A development of micropores of $CO_2$activated isotropic carbon fibers from TEM was observed. It was observed that the micropores of activated carbon fibers(ACFs) were consisted of slit-shaped pores(SP) and cylinder-shaped pores(CP). The SPs were formed between two parallel-carbon layers, and the CPs were formed at a place which is connected polygonally by more than two carbon layers. It was shown that the CPs of the ACFs were developed at high degree of burn-offs and at high activation temperature. The pore size distribution of the best ACF, which was observed at a highest value of specific surface area(3,495 $\m^2$/g), showed a continuous distribution in the range of about $4∼l5\AA$, and the median pore size was 6.7$\AA$. The super-high specific surface area of ACFs was found to be due to that the SPs were connected with a maximum size of 7∼8$\AA$ continuously, It is possible that the SPs should be formed in the ACFs in order to show super-high SSA.

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