CARBONFIBRILER, FREMGANGSMAADE TIL FREMSTILLING DERAF SAMT KOMPOSITIONER INDEHOLDENDE DEM

摘要

An essentially cylindrical discrete carbon fibril has an essentially constant diameter of between approx. 3.5 and approx. 70 nm, e.g. between approx. 7 and 25 nm, a length which is greater than approx. 100 times the diameter, an outer zone of several essentially continuous layers of ordered carbon atoms and a separate inner core area, each of the layers and the core being located essentially concentrically around the cylinder axis of the fibril. The entire fibril is preferably essentially free from a covering of thermal carbon. The invention relates furthermore to a quantity of such fibrils. The fibril or a quantity of fibrils can be produced by a suitable metalliferous particle being brought into contact for a suitable period of time and at a suitable pressure with a suitable gaseous compound containing carbon at a temperature of approx. 850-1200 degree C, the ratio on a dry weight basis between the compound containing carbon and the metalliferous particle being at least approx. 100:1.