Self-organisation processes in the carbon arc for nanosynthesis

被引:25
|
作者
Ng, J. [1 ]
Raitses, Y. [1 ]
机构
[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
关键词
CATHODE DEPOSIT; NANOTUBES; DISCHARGE; TEMPERATURES; GRAPHITE; GROWTH; PLASMA;
D O I
10.1063/1.4906784
中图分类号
O59 [应用物理学];
学科分类号
摘要
The atmospheric pressure carbon arc in inert gases such as helium is an important method for the production of nanomaterials. It has recently been shown that the formation of the carbon deposit on the cathode from gaseous carbon plays a crucial role in the operation of the arc, reaching the high temperatures necessary for thermionic emission to take place even with low melting point cathodes. Based on observed ablation and deposition rates, we explore the implications of deposit formation on the energy balance at the cathode surface and show how the operation of the arc is self-organised process. Our results suggest that the arc can operate in two different ablation-deposition regimes, one of which has an important contribution from latent heat to the cathode energy balance. This regime is characterised by the enhanced ablation rate, which may be favourable for high yield synthesis of nanomaterials. The second regime has a small and approximately constant ablation rate with a negligible contribution from latent heat. (C) 2015 Author(s).
引用
收藏
页数:6
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