The Synthesis of Carbon Nanoparticles in a Compression Reactor in the Atmosphere of Buffer Gases

We investigated the physicochemical aspects of gas-phase nanopowder synthesis using a cyclic compression reactor. Compression precursors (methane, ethylene, acetylene) under conditions close to adiabatic ones in atmosphere buffer monatomic gases (argon, helium, neon) was used. The influence pressure reactor and volumetric ratio precursor/buffer gas mixture on composition, morphology, structure carbon-containing particles representing pyrolysis product studied. Complete observed for all studied precursors, but different conditions. Thermal decomposition methane, having minimum enthalpy formation, an with argon content 97.5 % at peak more than 10 MPa. Helium showed limited possibilities thermal relaxation fast reactions (< 50 ms). Only acetylene maximum formation decomposed helium. solid reaction products represented black colored powders bulk density 20–30 mg/cm 3 . were examined by transmission electron microscopy scanning microscopy, Raman scattering X-ray diffraction analysis. represent globular bulbous structures up 100 nm size, either hollow or filled inside. analysis presence graphite-like crystallite sizes less samples. mainly sp 2 hybridization carbon. method demonstrates wide range opportunities hydrocarbons aiming production variety carbon structures, which enables fine tuning terms yield required morphology practical use.