Microporous activated carbon fibers having huge specific surface areas are characterized as three-dimensional network of nano-sized graphite domains. We investigate ACF-hosting host-guest systmes aiming at novel phenomena produced by the host-guest interface interactions. An extraordinarily large amount of helium is condensed in the ACF mircoporss, suggesting the presence of ultra-micropores andthe enhancement in the heliumnano-graphite interaction .Chemisorbed oxygen molecules are stabilized in the singlet states caused bythe interaction iwth nano-graphite and it makes the micoposre volume swell. Iodine forms an intercaltation system with nano-graphites through charge transfer process, in contrast with the behavior of bulk graphite that does not accept iodine as an acceptor-type intercalate. Fluorine reacting with nano-graphite that does not accept iodine as an acceptor-type intercalate. Fluorine reacting with nano-gaphite gneerates dangling bond spins by breaking graphite #pi#-bonds, where the fluorine-induced defect is found to have a widely extended electronic structure.
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