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Carbon soot was generated by laser ablation under oxygen-free and regulated-temperature conditions at 300 K and 1500 K. The soot was significantly oxidised by being exposed to air in darkness. The degree of oxidation was determined to be 0.038±0.012 and 0.093±0.009 for the high temperature (HT) soot and the low temperature (LT) soot, respectively, on the basis of elemental analysis, XPS and Karl-Fischer...
Soot samples collected as bulk solids and by thermophoretic sampling at different residence times in a fullerene-forming premixed benzene/oxygen flat flame (C/O=0.96, P=5.34 kPa, 10% argon, v=25 cm/s) were analyzed by high resolution electron microscopy. The samples contained soot particles that were composed to some extent of amorphous and fullerenic carbon (e.g., curved layers and fullerene-molecule-sized...
Soot produced from graphite through arc discharge was separated into four fractions which were structurally analyzed. The toluene-soluble fraction carried C 60 , C 70 , and C 76 -C 120 fullerenes while the toluene-insoluble quinoline-soluble fraction (ca. 1 wt%) consisted of larger clusters of C 70 to C 400 which...
Samples of condensable material collected from low-pressure premixed and diffusion benzene/oxygen/argon flames were analyzed chemically to determine fullerene yield and by high-resolution transmission electron microscopy to characterize the fullerenic material on and within the soot particles. Results show that fullerene formation is sensitive to changes in operating conditions, such as fuel/oxygen...
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