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首页> 外文期刊>Journal of industrial and engineering chemistry >Effect of arc current on characteristics of nanocarbons prepared by cryogenic arc discharge method
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Effect of arc current on characteristics of nanocarbons prepared by cryogenic arc discharge method

机译：电弧电流对低温电弧放电法制备纳米碳特性的影响

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摘要

A variety of nanocarbons (nanohorns, nanoflowers and nanoclusters) could be prepared by arc discharge in cryogenic nitrogen with either graphite-graphite or iron-graphite electrodes manipulated by a strategy of automatic electrode delivering. Based on local thermal equilibrium assumption, magneto-hydrodynamic equations were taken into account for estimating the arc power efficiency of 60-84%, depending on the electrode combination. The effects of arc current on the morphology and yield of nanocarbons were investigated within a range of 75-150 A. Transmission electron microscopic analyses revealed that the synthesized product consisted of single-walled carbon nanohorns and multi-walled carbon nanoflowers with nominal diameters of 100-200 nm when graphite-graphite electrodes were employed but nanoclusters containing Fe nanoparticles inside carbon nanoshells with smaller size of 70-120 nm were mainly synthesized by iron-graphite electrodes subject to arc discharge in cryogenic nitrogen.
机译：可以通过在低温氮气中通过石墨石墨或铁石墨电极通过自动电极输送策略操纵的电弧放电来制备各种纳米碳（纳米角，纳米花和纳米簇）。基于局部热平衡假设，根据电极组合，考虑了磁流体动力学方程来估算60-84％的电弧功率效率。研究了电弧电流对75-150 A范围内纳米碳的形态和产率的影响。透射电子显微镜分析表明，合成产物由标称直径为100的单壁碳纳米角和多壁碳纳米花组成。当使用石墨-石墨电极时为-200 nm，而碳纳米壳内部较小尺寸为70-120 nm的含有Fe纳米颗粒的纳米团簇则主要是通过在低温氮气中进行电弧放电的铁-石墨电极合成的。

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