THE PECULIARITIES OF SYNTHESIS AND CERTIFICATION OF CARBON NANOSTRUCTURED MATERIALS

Abstract

The paper considers the peculiarities of pyrolytic synthesis and attestation of carbon nanostructured materials. It is noted that the factors which influence the formation of the product during pyrolysis could be: the reactor design, the method of energy introduction, preparation and chemical composition of the gas mixture, as well as the choice and preparation of the catalyst. We have researched the nanocarbon products during their heating from room temperature to 1,400 ° C and have found out the temperature interval of their interaction with air. The features oxidation by air various carbon nanomaterials are shown to be individual for each nanostructure. The studies of soot, fullerites, nanotubes, graphite have made it possible to give a qualitative assessment of the presence in the products of synthesis (unknown composition) of various carbon structures. The temperatures of the change in mass proved to be useful for determining the composition of their mixtures.

The paper shows that analysis of the curves corresponding to the oxidation of the initial fullerene-containing soot indicates the presence of at least three phases in the sample. Moreover, pyrolysis products analysis has showed that the degree of graphitization of such structures exerts a special influence on the interaction parameters (speed and temperature) of carbon nanostructures with air oxygen. During the acetylene pyrolysis, a mirror graphite-like film forms on the walls of the quartz reactor. The nature of its oxidation curves is identical to the character of the oxidation of graphite MPG-7, but is somewhat shifted to the high-temperature region. In this paper, a complex analysis of carbon nanostructures obtained by various methods is carried out for the first time, and it is also shown that carbon nanostructures can be classified according to their thermal stability in air at normal pressure.

https://doi.org/10.15518/isjaee.2018.19-21.072-090