title: Controlling the incorporation and release of C60 in nanometer-scale hollow spaces inside single-wall carbon nanohorns.
abstract: We succeeded in large-scale preparation of single-wall carbon nanohorns (SWNH) encapsulating C60 molecules in a liquid phase at room temperature using a "nano-precipitation" method, that is, complete evaporation of the toluene from a C60-SWNH-toluene mixture. The C60 molecules were found to occupy 6-36% of the hollow space inside the SWNH, depending on the initial quantity of C60. We showed that the C60 in C60@SWNHox was quickly released in toluene, and the release rate decreased by adding ethanol to toluene. Numerical analysis of the release profiles indicated that there were fast and slow release processes. We consider that the incorporation quantity and the release rate of C60 were controllable in/from SWNHs because SWNHs have large diameters, 2-5 nm.
authors.affiliation: Fundamental and Environmental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba 305-8501, Japan. ryuge@frl.cl.nec.co.jp
authors.forename: Ryota
authors.initials: R
authors.lastname: Yuge
authors.forename: Masako
authors.initials: M
authors.lastname: Yudasaka
authors.forename: Jin
authors.initials: J
authors.lastname: Miyawaki
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Kubo
authors.forename: Toshinari
authors.initials: T
authors.lastname: Ichihashi
authors.forename: Hideto
authors.initials: H
authors.lastname: Imai
authors.forename: Eiichi
authors.initials: E
authors.lastname: Nakamura
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Isobe
authors.forename: Hideki
authors.initials: H
authors.lastname: Yorimitsu
authors.forename: Sumio
authors.initials: S
authors.lastname: Iijima