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Novel Structure of Microporous Activated Carbon Fibers and Their Gas Adsorption

Published online by Cambridge University Press:  22 February 2011

Toshiaki Enoki ,
Norikazu Kobayashi ,
Atsuko Nakayama ,
Kazuya Suzuki ,
Chiaki Ishii ,
Katsumi Kaneko ,
Yuko Hosokoshi ,
Minoru Kinoshita ,
Morinobu Endo  and
Norifumi Shindo
Toshiaki Enoki
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Norikazu Kobayashi
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Atsuko Nakayama
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Kazuya Suzuki
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Chiaki Ishii
Affiliation:
Department of Chemistry, Chiba University, Chiba 260, Japan
Katsumi Kaneko
Affiliation:
Department of Chemistry, Chiba University, Chiba 260, Japan
Yuko Hosokoshi
Affiliation:
Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan
Minoru Kinoshita
Affiliation:
Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan
Morinobu Endo
Affiliation:
Department of Electrical Engineering, Shinshu University, Nagano 380, Japan
Norifumi Shindo
Affiliation:
Osaka Gas Corporation, Torishima, Konohana-ku, Osaka 554, Japan
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Abstract

Activated carbon fibers are a kind of microporous carbon. Using dangling bond spins attached to the peripheries of the micropores, we investigated the microporous structures in relation to the heat-treatment and gas adsorption effects. Functional groups weakly bonded to the graphitic backbone are removed by the heat-treatment at moderate temperatures 200-400°C, resulting in the generation of a variety of dangling bond spins. The heattreatment above 500°C brings about homogenization of the dangling bond spins. For gas adsorption, the introduction of helium gas strongly enhances the spin-lattice relaxation rate for the dangling bond spins. In addition to a remarkably large condensation of helium gas in the microporous region, the enhancement proves the presence of ultra-micropores which can accommodate only the smallest diameter helium atoms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 349: Symposium T – Novel Forms of Carbon II , 1994 , 73
Copyright
Copyright © Materials Research Society 1994

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References

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