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Make carbon nanostructures in less than one minute
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http://portal.acs.org/portal/acs ... ar=region1#P42_8050 Make carbon nanostructures in less than one minute. According to D. Ma, X. Bao, and coauthors at the Chinese Academy of Sciences (Dalian) and the University of Science and Technology of China (Hefei), multiwalled carbon nanotubes, nickel core–graphitic-shell nanocrystals, and graphitic hollow carbon nanospheres can be prepared rapidly by using a microwave-induced solid-state process. Mixing monodispersed nickel nanoparticles of a given particle size with polystyrene in ethyl acetate solvent, followed by sonication for 30 min and evaporation of the solvent in a rotary evaporator, gives a good dispersion of the nanoparticles in the polystyrene. Microwave irradiation in an inert atmosphere for <1 min produces multiwalled carbon nanotubes or nickel core–graphitic-shell nanocrystals. According to the authors, the nickel particle size determines the final product. Large nickel nanoparticles (40–600 nm) result in nickel–graphitic-shell nanocrystals, whereas nickel nanoparticles <8 nm lead to multiwalled carbon nanotubes. Graphitic hollow carbon nanospheres were obtained when the nickel core was removed from the nickel–graphitic-shell nanocrystals. (Chem. Commun. 2008, 2765–2767; George Xiu Song Zhao) [ Last edited by FLY_Phoenix on 2008-8-5 at 23:22 ] |
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