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|Type:||Artigo de periódico|
|Title:||Liquid carbon, carbon-glass beads, and the crystallization of carbon nanotubes|
|Author:||de Heer, WA|
|Abstract:||The formation of carbon nanotubes in a pure carbon arc in a helium atmosphere is found to involve liquid carbon. Electron microscopy shows a viscous liquid-like amorphous carbon layer covering the surfaces of nanotube-containing millimeter-sized columnar structures from which the cathode deposit is composed. Regularly spaced, submicrometer-sized spherical beads of amorphous carbon are often found on the nanotubes at the surfaces of these columns. Apparently, at the anode, liquid-carbon drops form, which acquire a carbon-glass surface due to rapid evaporative cooling. Nanotubes crystallize inside the supercooled, glass-coated liquid-carbon drops. The carbon-glass layer ultimately coats and beads on the nanotubes near the surface.|
|Editor:||Amer Assoc Advancement Science|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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