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Thermal motion of carbon clusters and production of carbon nanotubes by gravity-free arc discharge

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2 Author(s)
Mieno, T. ; Department of Physics, Shizuoka University, Ooya, Suruga-ku, Shizuoka 422-8529, Japan ; Takeguchi, M.

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Thermal and diffusion properties of hot gas around a dc arc discharge under a gravity-free condition are investigated using a jet plane in order to improve the arc production of carbon clusters. Spherically symmetric temperature distribution of He gas around the arc plasma and monotonic slow expansion of the high-temperature region are observed. By means of the passive-type Mie scattering method, random slow diffusion of carbon clusters around the arc plasma is clearly observed under the gravity-free condition. This indicates that carbon clusters including single-walled carbon nanotubes are synthesized around the arc plasma where the He temperature is higher than 1000 K. It is confirmed that large bundles of fatter single-walled carbon nanotubes are produced under the gravity-free condition.

Published in:

Journal of Applied Physics  (Volume:99 ,  Issue: 10 )