| 摘要 |
PROBLEM TO BE SOLVED: To provide a fine carbon fiber suitable for resin cement of a composite material such as a resin, rubber, semiconductor material, catalyst or gas occlu sion material. SOLUTION: This fine carbon fiber having an annual ring structure of multiple layered structure obtained by overlapping cylindrical carbon layers of which central axis has a cavity structure, having a knot part obtained by extending or thickening of the multi-layered structure of the carbon fiber to the outside of the fiber, or changing the outer diameter of the fiber along the fiber length by repeated presence of the parts where the carbon fiber extends to the outside and resulting approximately 1-500 nm outer diameter and approximately 10-15,000 aspect ratio is provided. Suitably, the ratio (d'/d) of the carbon fiber diameter (d') including the knot parts presenting on the carbon fiber surface to the carbon fiber diameter (d) excluding the knot parts is approximately >1.5 and approximately≤10, and the ratio (d''/d) of the outer diameter (d'') of the part obtained by the repeated extension of the carbon fiber to the carbon fiber diameter (d) excluding such parts is approximately >1.05 and approximately≤3. COPYRIGHT: (C)2003,JPO
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