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Hydrogenated amorphous carbon thin films (a:C-H) are very promising materials for numerous applications. The growing of relevance of a:C-H is mainly due to the long-term stability of their outstanding properties. For improving their performances, a full understanding of their local chemistry is highly required. Fifteen years ago, electron energy-loss spectroscopy (EELS), developed in a transmission...
Nitrogen and carbon dioxide adsorption experiments have been used to investigate the porosity of carbon deposits formed in the Tore Supra tokamak as a consequence of the erosion of the plasma-facing components. We compare BET, α s -, and Dubinin–Raduskevich methods to distinguish between micropore volume (∼0.04cm 3 g −1 ) and external surface (∼90m 2 g −1 )...
For safety reasons, the formation of carbon deposits in tokamaks must be limited. To understand how these deposits are formed, a comparative study of the characteristics of carbon deposits collected in TEXTOR and Tore Supra tokamaks has been performed. Both deposits exhibit self-similar morphologies like asparagus tips. Transmission electron microscopy performed on thin foils also reveals structure...
Sulphur dioxide is an atmospheric pollutant which, among numerous others, has to be eliminated by habitacle filters. Breakthrough curves of low concentration SO 2 streams through beds of activated carbons have been obtained. Two carbons were studied, an activated PAN fiber (CF) and a granulated activated carbon (CN) under SO 2 concentrations lower than 100 ppm. Carbon CN used 'as received'...
The carbon nitride (CN x ) films have been prepared by infrared (IR; at 10.6 μm) and ultraviolet (at 248 nm) laser induced chemical vapour deposition (CVD) using different ethylene/nitrous oxide/ammonia mixtures. The partial concentration of ammonia in mixtures was varied in order to obtain a higher nitrogen incorporation in the deposited films. The changes induced in the gas-phase composition...
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