Abstract: The present invention relates to a process for synthesizing carbon nanotubes by continuous chemical vapor deposition at the surface of reinforcements, said reinforcements constituting a mixture A (i) of particles and/or fibers of a material comprising at least one oxygen atom and (ii) of particles and/or fibers of a material chosen from carbides and/or of a material comprising at least one silicon atom, said process comprising the following steps, carried out under a stream of inert gas(es) optionally as a mixture with hydrogen: (i) heating of said mixture of reinforcements A in a reaction chamber at a temperature ranging from 400° C. to 900° C.

Abstract: The present invention relates to a method for enhancing the adhesion of CNTs to the surface of a material, including the following steps carried out under an inert gas current or currents optionally mixed with hydrogen: (i) heating the material including CNTs on the surface thereof in a reaction chamber, to a temperature of between 500° and 1,100° C.; (ii) introducing into said chamber a carbon source consisting of acetylene and/or xylene, in the absence of a catalyst; (iii) exposing the heated material to the carbon source for a period of time sufficient to ensure the production of a carbon layer of controlled thickness on the surface of said material and said CNTs covering same, as shown in the figure below; and (iv) optionally recovering the material thus covered after cooling, upon completion of step (iii). The invention likewise relates to hybrid carbon-coated reinforcements and to the uses thereof for preparing structural and functional composite materials or for preparing paints or varnishes and wires.

Abstract: The present invention relates to a process for synthesizing carbon nanotubes by continuous chemical vapour deposition at the surface of reinforcements, said reinforcements constituting a mixture A (i) of particles and/or fibres of a material comprising at least one oxygen atom and (ii) of particles and/or fibres of a material chosen from carbides and/or of a material comprising at least one silicon atom, said process comprising the following steps, carried out under a stream of inert gas(es) optionally as a mixture with hydrogen: (i) heating of said mixture of reinforcements A in a reaction chamber at a temperature ranging from 400° C. to 900° C.

Abstract: The invention relates to a method for the synthesis of carbon nanotubes on the surface of a material. The invention more particularly relates to a method for the synthesis of carbon nanotubes (or CNT) at the surface of a material using a carbon source comprising acetylene and xylene, and a catalyst containing ferrocene. The method of the invention has the advantage, amongst others, of enabling the continuous synthesis of nanotubes when desired. Also, the method of the invention is carried out at temperatures lower than those of known methods and on materials on which the growth of carbon nanotubes is difficulty reproducible and/or difficulty homogenous in terms of CNT diameter and density (number of CNT per surface unit). Said advantages, amongst others, make the method of the invention particularly useful at the industrial level.

Abstract: The invention concerns a method for obtaining carbon nanotubes by CVD growth on nano/micrometric supports, characterized in that it comprises: adding a carbon source compound containing a catalyst, under an inert gas and hydrogen current. The invention is applicable to the manufacture of multiple-scale composites.