Fibrous fine carbon particles and method for producing the same

Abstract

Fibrous fine carbon particles of a novel structure improved in dispersibility in the dispersing media are provided. These particles have a minor diameter of 5 nm to 5 μm and have a rugged structure in which the mean value of surface roughness defined by the following equation (I) is not less than 8.0%: Surface roughness(%)=((Sd−Hd)/Hd)  (I) (In determination of surface roughness, surface ruggedness of the fine carbon particles is measured by AFM Tapping Mode, forming the two-dimensional images of the particles from the obtained data, then an arbitrary straight line is selected on the two-dimensional images, forming the outline from the above data corresponding to the said straight line, then a section of measurement (S) is selected, said section being an area where the length of the virtual straight line connecting the two points on the said outline is within the range of 20 to 35 nm, and with the length of the virtual straight line between the said two point being represented by Hd and the length of the actual outline between the two point being represented by Sd, surface roughness is calculated from the above equation (I); the section of measurement (S) is a portion where the deviation of the outline from the virtual straight line is ±0.5 Hd.)

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