We found that ethanol vapor forced C 60 encapsulated inside single-wall carbon nanohorns (SWNHs) to exit from SWNHs at room temperature, and in reverse, toluene vapor forced the ejected C 60 to re-enter. Interestingly, these entrance and exit behaviors were repeatable. Thermogravimetric analyses suggested C 60-toluene pseudosolvate formation in internal hollow nanospaces of SWNHs. We consider the mechanism of the backand-forth transportations; the coincorporated toluene lured C 60 from inside to outside SWNHs through adsorbed layers of ethanol formed on the SWNH surfaces. In the re-entrance, the toluene-adsorbed layer mediated transportation of C 60 from outside to the most stable sites, that is, inside SWNHs.
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