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• W2020452862 abstract "Abstract Multiwalled carbon nanotubes (MWCNTs) have been produced with a DC arc‐discharger in the presence of hydrogen, helium or hydrogen‐helium mixtures using high gas pressures (60 kPa–140 kPa) and varying gas pressure ratios (10%–100% hydrogen in helium at 100 kPa). Variation of He pressure hardly affected the cathode deposit formation while increased H2 pressure resulted in an increase in chamber soot and cathode material formation but a relative decrease in the % MWCNT production. Varying H2/He gas ratios at a constant total pressure of 100 kPa revealed that increasing H2 content gave increased cathode deposit formation because of a faster anode consumption rate as well as more total gaseous product formation. Further, a maximum MWCNT deposit was obtained from a 50/50 gas mixture. GC‐MS analysis of the gaseous products trapped from these reactions showed evidence for the presence of linear alkynes (ethyne, butyne, pentyne, hexyne etc.), benzene, naphthalene, anthracene, and their methylated analogues. The relative in‐situ temperature of the reaction with the pure gases was monitored and revealed that the highest temperature was recorded for the reaction with 60 kPa H2, which also produced the maximum amount of MWCNTs (80%). Impure samples from the cathode deposit were analysed by TEM and showed that in the majority of cases rectangular closed‐tipped nanotubes were synthesised, together with varying amounts of onion‐like sheets and folded graphene sheets." @default.
• W2020452862 created "2016-06-24" @default.
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• W2020452862 date "2005-04-06" @default.
• W2020452862 modified "2023-09-27" @default.
• W2020452862 title "The Effect of Hydrogen, Helium and Their Mixtures on the Synthesis of Carbon Nanotubes in a DC Arc‐Discharger" @default.
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• W2020452862 doi "https://doi.org/10.1081/fst-200050697" @default.
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