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Formation of bamboo-shaped carbon nanotubes on carbon black in a fluidized bed
- Source :
- Journal of Nanoparticle Research. 14
- Publication Year :
- 2012
- Publisher :
- Springer Science and Business Media LLC, 2012.
-
Abstract
- For the first time, bamboo-shaped multiwalled carbon nanotubes, having diameter of the order of 50 nm, have been grown on carbon black in a fluidized bed in bulk amount. The activation energy for the synthesis of the product was found out to be around 33 kJ/mol in the temperature range of 700−900 °C. The carbon nanotubes were separated from the carbon black by preferential oxidation of the later, the temperature of which was determined by thermogravimetry. The transmission electron microscopy revealed different features of the nanotubes such as “Y” junction, bend, and catalyst filling inside the nanotubes. Small angle neutron scattering was performed on the nanotubes synthesized at different temperatures. The data were fitted into a suitable model in order to find out the average diameter, which decreases with increase in synthesis temperature. The Monte Carlo simulation predicts the same behavior. Based on the above observations, a possible growth mechanism has been predicted. The oscillation in carbon saturation value inside the catalyst in the fluidized bed has been indicated as the responsible factor for the bamboo-shaped structure.
- Subjects :
- Materials science
Carbon nanofiber
Bioengineering
General Chemistry
Carbon black
Carbon nanotube
Activation energy
Atmospheric temperature range
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter Physics
Small-angle neutron scattering
Atomic and Molecular Physics, and Optics
law.invention
Thermogravimetry
Condensed Matter::Materials Science
Chemical engineering
law
Fluidized bed
Modeling and Simulation
General Materials Science
Composite material
Subjects
Details
- ISSN :
- 1572896X and 13880764
- Volume :
- 14
- Database :
- OpenAIRE
- Journal :
- Journal of Nanoparticle Research
- Accession number :
- edsair.doi...........da39ad1c1498d0208050ef7d583813d2