金属添加炭素試料からのクラスター生成と化学反応(熱工学,内燃機関,動力など)

概要

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Metal-carbon binary clusters are believed to be important precursor clusters both for single-walled carbon nanotubes (SWNTs) and endohedral metallofullerene. Metal-carbon binary clusters (MC_n M=La, Ni or Co) and carbon clusters (C_n) were generated with a pulsed laser-vaporization supersonic-expansion cluster beam source directly connected to the FT-ICR (Fourier transform ion cyclotron resonance) mass spectrometer, and chemical reaction of MC_n^- and C_n^- with nitric oxide was studied. Depending on the metal element, the generation efficiency and the reactivity of metal-carbon binary clusters were completely different. LaC_n^- (n = even, n>36) was much less reactive to NO than pure carbon clusters, while MC_n^- (M = Ni or Co) was much more reactive than pure carbon clusters. It was speculated that LaC_n^- (n=even, n>36) had a fullerene-like cage structure with a metal atom inside, and that MC_n^- (M = Ni or Co) had an imperfect cage structure where a metal atom preferentially attached to the imperfect site.
社団法人日本機械学会の論文
2003-08-25