CsC24 samples were prepared from artificial graphite materials, derived from petroleum cokes and additional pitch binder, with different heat-treatment temperatures (HTTs) between 1300 and 2800°C. The sorption isotherms for the systems, CsC
24-H
2, -D
2, -N
2 and-Ar at 77K were determined. All the CsC24 samples were able to take up these molecules, irrespective of the HTT of the host materials. The saturated amount of sorption, (
nmolecule/
nCs)
sat., increased with HTT of the host carbons. For H
2-and D
2-sorption, (
nmolecule/
nCs)
sat. increased monotonically with HTT from HTT-1300 up to-2000, and then stepwise increase was observed from HTT-2000 up to -2800. This behavior was considered to be a manifestation of the drastic change of the structure of host carbons at around HTT-2000. The sorption isotherms were well fitted by the Langmuir equation. This fact suggested the sorbed molecules are accommodated in the interlayer nanospace even for CsC
24 samples prepared from carbons with low HTT such as HTT-1300.
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