Open AccessFlame Synthesis of Carbon Nanotubes Using Low Calorific Value Gases
Author(s) -
Jorge Camacho,
Mahesh Subramanya,
Ahsan Choudhuri
Publication year - 2007
Publication title -
osti oai (u.s. department of energy office of scientific and technical information)
Language(s) - English
Resource type - Reports
DOI - 10.2172/924881
Subject(s) - diffusion flame , combustion , materials science , analytical chemistry (journal) , carbon nanotube , diffusion , soot , carbon fibers , amorphous carbon , amorphous solid , chemical engineering , chemistry , nanotechnology , combustor , thermodynamics , crystallography , organic chemistry , composite material , physics , composite number , engineering
Nanostructures formed in diffusion flames of pure fuels [CH{sub 4}, C{sub 3}H{sub 8}, and C{sub 2}H{sub 2}] at different fuel flow rates have been analyzed. Synthesis samples have been also collected from diffusion flames of various fuel blends [H{sub 2}-CH{sub 4}, H{sub 2}-CO, H{sub 2}-C{sub 3}H{sub 8}, H{sub 2}-C{sub 2}H{sub 2}] at different combustion conditions. SEM images of particulate samples collected from H{sub 2}-CH{sub 4} diffusion flames show formation of nanostructures. However, the formation of nanostructures only occurs at a narrow window of fuel compositions (< 10% H{sub 2} concentration in the mixture) and flow conditions (Jet Exit Reynolds number Re{sub j} = 200). At higher H{sub 2} concentration and flow velocity, formation of nanostructures diminishes and H{sub 2}-CH{sub 4} flames produce amorphous carbon and soot particles
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