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A sector deposition mechanism of carbon onions operated in a large discharge furnace
Fullerenes, Nanotubes and Carbon Nanostructures ( IF 2.3 ) Pub Date : 2020-09-23 , DOI: 10.1080/1536383x.2020.1824184
Zhigang Li 1 , Dou Zhang 2 , Chao Ruan 3 , Hongtao Zhao 1 , Yujin Wang 4 , Yongfu Lian 5
Affiliation  

Abstract Due to the lack of comprehensive understanding of the formation mechanism, the preparation of carbon onions by arc discharge is still an uncontrollable process, which restrains their massive and stable production. Taking advantage of the transient nature of the arc discharge, we successfully captured the nanoparticle morphology in each growing stage during the carbon onion formation process in a large discharge furnace with chamber radius of 22.5 cm. Scanning electron microscope images of raw soot show that massive spherical aggregations are enriched in nanoparticles, and high-resolution transmission electron microscope images reveal fairly heterogeneous nanoparticles which are corresponding to varying growing stages of carbon onions. It is proposed that the change from the well-ordered graphite to another ordered polyhedral and nickel-encapsulated carbon onions is via a non-crystalline intermediate state, and carbon onions begin to deposit through a novel sector mechanism, i.e. the inner and outer carbon shells are simultaneously precipitated and grow away from or along the catalyst surface to form a polyhedral or metal encapsulated carbon onion, respectively.

中文翻译:

大型放电炉中碳洋葱扇形沉积机理

摘要 由于对形成机理缺乏全面了解,电弧放电制备碳洋葱仍是一个不可控的过程,制约了其大规模稳定生产。利用电弧放电的瞬态特性,我们在腔室半径为 22.5 cm 的大型放电炉中成功捕获了碳洋葱形成过程中每个生长阶段的纳米颗粒形态。原始烟尘的扫描电子显微镜图像显示大量球形聚集体富含纳米粒子,高分辨率透射电子显微镜图像显示相当不均匀的纳米粒子,它们对应于碳洋葱的不同生长阶段。
更新日期:2020-09-23
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