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- W2034097615 abstract "A decrease in electron density and a strong increase of electron energy, which induce the enhancement of excitation rates, have been observed in CH4–CO2 plasmas when the inlet methane concentration is high enough and the input microwave power sufficiently low. Together with the decrease in the electron density with plasma duration, they are characteristic of dust formation in these plasmas. In these conditions, the formation of hydrocarbon radicals which are well known precursors of soot and the formation of first stable aromatics are reported, as observed by molecular beam mass spectrometry. Modelling of the chemistry in the plasma is carried out, which can also predict the formation of low concentrations of polyaromatic hydrocarbons. These species could be involved in the homogeneous nucleation process of carbon. As a function of the plasma duration, various carbon nanostructures are observed in the particles collected downstream of the plasma. For short durations, nanodiamond grains are formed with the size range 15–100 nm. They are composed of diamond nanocrystals of about 2–10 nm in size; these values are generally observed for all diamond nanocrystals formed in extraterrestrial and terrestrial conditions. For longer plasma durations, sp2-hybridized carbons are obtained. Their structure varies from soot to more ordered graphitic carbons nearly similar to 'onions' and structures similar to those observed in tokamaks. The control of the size and the microstructure of the nanodiamond grains are especially important as this could open possibilities for applications in a wide range of fields." @default.
- W2034097615 created "2016-06-24" @default.
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- W2034097615 date "2010-03-12" @default.
- W2034097615 modified "2023-10-15" @default.
- W2034097615 title "Diagnostics in dusty C–H–O plasmas with diamond and graphitic nanoparticle generation" @default.
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- W2034097615 doi "https://doi.org/10.1088/0963-0252/19/2/025015" @default.
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