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Synthèse en phase gazeuse de nanoparticules de carbone par plasma hors équilibre

Maryline Moreno 1
1 CEP/Sophia
CEP - Centre Énergétique et Procédés
Abstract : This work deals with carbon nanoparticles synthesis by a gas phase non-equilibrium plasma process.First, the literature review, devoted to carbon black and carbon nanotubes, presents the different existing gas phase processes (conventional and plasma) and the growth mechanism of these nanoparticles. Then, the development and the set-up of the non-equilibrium plasma process, based on the establishment of low current - high voltage non thermal discharges, are described. Next, the experimental results related to the process characterisation are presented, namely : the electrical characterisation of the plasma torch without any reagent injection and the characterisation with hydrocarbon injection. This latter is based on a parametric study and mass balances (conversion rate estimated by Gas Chromatography, GC, measurements). The synthesized carbon nanoparticules are analysed by Scanning and Transmission Electron Microscopy (SEM and TEM), X-rays diffraction and BET analysis. Two main carbon nanoparticles families are highlighted depending on their texture : (i) Nanoparticles with a concentric tendency texture such as "classic" carbon black, acetylene like carbon black and carbon hulls filled with metal, (ii) Nanoparticles with an isotropic globally texture such as "crumpled paper sheets" with high or low nanotexture and "microporous" nanoparticles. A correlation between operating conditions and nanoparticles' structural characteristics is presented. Finally, a chemical kinetic model allows to estimate the process reacting volume while the computational fluid dynamics models provide an evaluation of the temperature and velocity distribution and the thermal history of the particles inside the reactor.
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Submitted on : Monday, June 4, 2007 - 8:00:00 AM
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  • HAL Id : pastel-00002356, version 1

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Maryline Moreno. Synthèse en phase gazeuse de nanoparticules de carbone par plasma hors équilibre. Sciences de l'ingénieur [physics]. École Nationale Supérieure des Mines de Paris, 2006. Français. ⟨NNT : 2006ENMP1433⟩. ⟨pastel-00002356⟩

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