FRACTAL STRUCTURE OF CARBON-FIBERS

Small-angle neutron scattering by a cloth sample made of carbon fibers reveals that the fibers have a structure typical of bulk and surface fractals. The bulk fractal dimension D and the surface fractal dimension D(s) are the same, D congruent-to D(s) congruent-to 2.7, within the experimental errors. These results can be explained in a natural way if it is assumed that the fibers of the cloth consist of fractal clusters with a dimension D congruent-to 2.7 and a radius R(c) congruent-to 200-400 angstrom which are formed from carbon particles of radius r0 congruent-to 18 angstrom.