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Preparation of fullerenes by resistive heating vaporization method; Effect of carbon materials

抵抗加熱蒸発法によるフラーレンの調製; 炭素材料の効果

大槻 龍生*; 那須 昭一*; 藤森 亮介*; 穴田 欣司*; 大橋 憲太郎*; 山本 涼市*; 藤井 貴美夫; 大久保 啓介*

Otsuki, Ryusei*; Nasu, Shoichi*; Fujimori, Ryosuke*; Anada, Kinji*; Ohashi, Kentaro*; Yamamoto, Ryoichi*; Fujii, Kimio; Okubo, Keisuke*

煤煙中に生じた(C$$_{60}$$+C$$_{70}$$)フラーレンの収量と生成したC$$_{60}$$の割合(重量比)に対する素材である炭素材料の効果を調べた。素材にはGlassy carbon等4種類の炭素材料を用い、圧力0.7$$times$$10$$^{4}$$$$sim$$8.0$$times$$10$$^{4}$$Paのヘリウムガス中でジュール加熱して蒸発させフラーレンを調製した。Glassy Carbonを素材に用いた場合に比べて、1$$sim$$8%の六方晶黒鉛における(C$$_{60}$$+C$$_{70}$$)フラーレンの収量は高かった。また、ヘリウムガス圧が4.0$$sim$$5.3$$times$$10$$^{4}$$Paの範囲で、収量は極大を示した。フラーレン中のC$$_{60}$$の割合はいずれの炭素材料の場合でも約60$$sim$$70%で、ヘリウムガス圧や容器の大きさにも依存しなかった。

Effects of carbon materials on weight yield of (C$$_{60}$$+C$$_{70}$$) and weight ratios of C$$_{60}$$ to (C$$_{60}$$+C$$_{70}$$) in soot were examined by the Joule resistive heating of four kinds of carbon materials at He gas pressures from 0.7$$times$$10$$^{4}$$$$sim$$8.0$$times$$10$$^{4}$$Pa for collector radii of 45, 50 and 55mm. The yields were in the range of 1 to 8% for graphite with hexagonal lattice, and better than those for glassy carbon. The most effective He gas pressure for the fullerene yield were in the range of 4.0$$sim$$5.3$$times$$10$$^{4}$$Pa. Any collector radii dependence of the yields was not observed. The weight ratios of C$$_{60}$$ to (C$$_{60}$$+C$$_{70}$$) were about 60 to 70%, and showed neither He gas pressure depenndennce nor collector radii depenndence four kinds of carbon materials.

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