Condensed-Matter Physics & Materials Science Seminar

"Flame Synthesis of Carbon Nanotubes"

Presented by Jorge Camacho

Wednesday, May 31, 2006, 1:30 pm — Bldg. 480 conference room

Flame synthesis of carbon nanostructures including nanotubes on galvanized steel was investigated utilizing laminar diffusion flames. Methane (CH4), propane (C3H8) and acetylene (C2H2) were used as the carbon source. Distinctive carbon nanostructures were produced depending on the fuel type and fuel flow rate. Based on the quantitative analysis of many transmission electron microscope (TEM) and scanning electron microscope (SEM) images, the nanotubes synthesized by acetylene flames were of different types that included helically coiled nanotubes depending on the fuel flow rate. Methane produced thin multi wall carbon nanotubes as well as nanorods and nanofibers within the fuel flow rate range of 7.18E-07 m3/s to 9.57E-07 m3/s. Propane yielded nanotubes only at the fuel flow rate of 4.20E-07 m3/s. The yield of the carbon nanostructures was further increased by changing the local convective time scale with the addition of controlled turbulence. Turbulent flames synthesized about 60% more carbon material than the laminar flames at same conditions. In average, carbon nanotubes oxidized at a temperature of about 618 C with a residual mass of about 14% of the material weight.

Hosted by: Lance Cooley

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