Novel nanometer-level uniform amorphous carbon coating for boron powders by direct pyrolysis of coronene without solvent.
Nanotechnology
; 26(4): 045602, 2015 Jan 30.
Article
em En
| MEDLINE
| ID: mdl-25556855
ABSTRACT
A 3 nm coronene coating and a 4 nm amorphous carbon coating with a uniform shell-core encapsulation structure for nanosized boron (B) powders are formed by a simple process in which coronene is directly mixed with boron particles without a solvent and heated at 520 °C for 1 h or at 630 °C for 3 h in a vacuum-sealed silica tube. Coronene has a melting point lower than its decomposition temperature, which enables liquid coronene to cover B particles by liquid diffusion and penetration without the need for a solvent. The diffusion and penetration of coronene can extend to the boundaries of particles and to inside the agglomerated nanoparticles to form a complete shell-core encapsulated structure. As the temperature is increased, thermal decomposition of coronene on the B particles results in the formation of a uniform amorphous carbon coating layer. This novel and simple nanometer-level uniform amorphous carbon coating method can possibly be applied to many other powders; thus, it has potential applications in many fields at low cost.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Compostos Policíclicos
/
Pós
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Boro
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Carbono
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Nanoconchas
Limite:
Humans
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article