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Fibers of polyacrylonitrile (PAN), or commonly referred to as acrylic fibers, are found to have many applications. Acrylic fibers are used as a textile medium for high quality and high performance yarns and fabrics, and also as the main supply of precursors for carbon fibers. The main reason of its use as carbon fiber precursor is that the polymer gives high mechanical properties with high carbon...
We investigate the formation and stability of Fe nanoparticles on TiN and poly-crystalline PtSi films, and their ability to grow carbon nanotubes forests. Using different-microstructure films, coated with or without their native oxides, we show that, upon purely-thermal catalyst pretreatment, PtSi favours the formation of homogenously sized nanoparticles and forest growth, partly due to its low surface...
We have developed a direct current plasma pretreatment of the Fe catalyst to increase the area density of vertically-aligned carbon nanotube forests. The carbon wall density of the double- and multi-walled nanotubes reaches 4.8×10 12 cm −2 , with a 40% volume occupancy and a mass density of ∼0.4gcm −3 . The plasma pretreatment works by reducing the sintering of the catalyst...
We report new photoluminescent carbon nanoparticles having an average particle size of 50nm. When dispersed in chloroform and excited with 325nm wavelength, the solution showed strong photoluminescence at 475nm with 12–13% quantum yield. A well dispersed photoluminescent solution can also be prepared with ethanol, xylene or hexane using the nanoparticles. The nanoparticles were prepared by a simple...
The reaction rate in the reaction of NO with an ashless carbon black was considerably enhanced in the presence of oxygen. A similar effect has also been observed in the reaction of NO with the oxidized carbon black. The creation of more active sites on the carbon surface in the reaction with oxygen and NO 2 (produced by the reaction of NO with O 2 ) is proposed to be responsible for...
The mechanism of the reaction of NO with ashless carbon black was studied in detail. The differences between the amounts of oxygen and nitrogen measured and the calculated concentrations of oxygen and nitrogen suggest the formation of surface carbon-oxygen complexes C(O) and carbon-nitrogen complexes C(N). The dependence of the specific rate of reaction at its initial stage on temperature is different...
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