Abstract
The adsorption isotherms of He on different kinds of microporous carbon fibers(activated carbon fibers:ACFs) at 4.2 K have been determined gravimetrically. The He adsorption isotherms were of more typical type I than the N2 adsorption isotherms, suggesting that He molecules can have access even to ultramicropores without slow diffusion problem. Both He and N2 adsorption isotherms were analyzed by the two-term Dubinin-Radushkevich equation. Only polyacrylonitrile-based ACF had the same micropore volume by He adsorption and that N2 adsorption. On the other hand, the micropore volumes by He adsorption of other ACF samples were greater than those by N2 adsorption, indicating the presence of ultramicropores. The structural causes for the ultramicropores were suggested.
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