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http://dx.doi.org/10.3740/MRSK.2003.13.11.749

Microstructural Changes during Activation Process of Isotopic Carbon Fibers using CO2 Gas(II)-TEM Study  

Roh, J.S. (School of Advanced Materials and Systems Engineering, Kumoh National University of Technology)
Publication Information
Korean Journal of Materials Research / v.13, no.11, 2003 , pp. 749-755 More about this Journal
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.
Keywords
ACF; TEM; micropore; pore structure; isotropic carbon fiber;
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  • Reference
1 K. Kaneko, C. Ishii, M. Ruike and H. Kuwabara, Carbon, 30, 1075 (1992)   DOI   ScienceOn
2 K. Oshida, K. Kogiso, K. Matsubayashi, K. Takeuchi, S. Kobayashi, M. Endo, M. S. Dresselhaus and G. Dresselhaus, J. Mater. Res., 10, 2507 (1995)   DOI
3 M. G. Dobb, H. Guo, D. J. Johnson and C. R. Park, Carbon, 33, 1553 (1995)   DOI   ScienceOn
4 H. S. Shim and R. Hurt, Carbon 97, July 18-23, 438 (1997)
5 N. Yoshizawa, Y. Yamada and M, Shiraishi, Journal of Materials science, 33, 199 (1998)   DOI   ScienceOn
6 M. Endo, T. Furuta, F. Minoura and C. Kim, Supramolecular Science, 5, 261 (1998)   DOI   ScienceOn
7 D. Y. Kim, Y. Nishiyama, M. Wada and S. Kuga, Carbon, 39, 1051 (2001)   DOI   ScienceOn
8 K. Oshida, T. Nakazawa, T. Miyazaki and M. Endo, Synthetic Metals, 125, 223 (2002)   DOI   ScienceOn
9 M. Huttepain, A. Oberlin, Carbon, 28, 103 (1990)   DOI   ScienceOn
10 S. J. Gregg and K. S. W. Sing, 'Adsorption, Surface Area and Porosity', Academic Press, London (1982)
11 S. Lu, C. Blanco and B. Rand, Carbon, 38, 3 (2000)
12 A. Sharma, T. Kyotani and A. Tomita, Carbon, 38, 1977 (2000)   DOI   ScienceOn
13 A. K. Kercher and D. C. Nagle, Carbon, 41, 15 (2003)   DOI   ScienceOn
14 N. Yoshzawa, K. Maruyama, Y. Yamada and M. Zielinska-Blajet, Fuel, 79, 1461 (2000)   DOI   ScienceOn
15 K. Oshida, M. Endo, T. Nakajima, S. L. di Vittorio, M. S. Dresselhaus and G. Dresselhaus, J. Mater. Res. 8, 512 (1993)   DOI
16 J. R. Fryer, Carbon, 19, 431 (1981)   DOI   ScienceOn
17 H. Marsh, D. Crawford, T. M. O'Grady and A. Wennerberg, Carbon, 20, 419 (1982)   DOI   ScienceOn
18 J. S. Roh and D. S. Suhr, Korean J. Materials Research, 8, 120 (1998)
19 A. Sharma, T. Kyotani and A. Tomita, Fuel, 78, 1203 (1999).   DOI   ScienceOn
20 J. S. Roh and D. S. Suhr, Korean J. Materials Research, 8, 114 (1998)
21 J. S. Roh, Korean J. Materials Research, in press (2003)
22 A. W. P. Fung, A. M. Rao, K. Kuriyama, M. S. Dresselhaus, G. Dresselhaus, M. Endo and N. Shindo, J. Mater. Res., 8, 489 (1993)   DOI
23 P. J. M. Carrot and K. S. W. Sing, 'Characterization of Porous Solid', 77, Ed. by K. K. Unger, J. Rouquerol, K. S. W. Sing and H. Kral, Elsevier Sci. Publ., Amsterdam (1988)
24 M. C. Mittelmeijer-Hazeleger and J. M. Martin-Martinez, Carbon, 30, 695 (1992)   DOI   ScienceOn
25 H. Marsh, Carbon, 25, 49 (1987)   DOI   ScienceOn