In:
Proceedings, annual meeting, Electron Microscopy Society of America, Cambridge University Press (CUP), Vol. 53 ( 1995-08-13), p. 216-217
Abstract:
Since it was discovered that crystalline materials could be encased in graphite shells, protection in this manner has been the focus of significant research. Previously, production of graphite encapsulated crystalline nanoparticles has been reported using an arc discharge between an anode stuffed with a metal oxide and a graphite cathode, resulting in a mixture of carbides, encapsulated carbides and carbonaceous debris. More recently, an arc discharge between metal electrodes has been used to produce large quantities of pure metal nanoparticles, with the addition of graphite to the anode resulting in the large scale production of graphite encapsulated metal nanoparticles (GEMN). In earlier studies, these materials were separated from the other products of the arc discharge only by a magnetic gradient, which does not remove the non-encapsulated crystalline particles. Therefore, the immersion of the product mixture in an acid bath was added as a subsequent processing step. The combined arc discharge/acid bath technique reduces both production and separation problems, producing a large quantity of Fe, Co, and Ni GEMN free from any non-encapsulated metal particles. Subsequent characterization of the resulting material has led to a better understanding of the GEMN produced.
Type of Medium:
Online Resource
ISSN:
0424-8201
,
2690-1315
DOI:
10.1017/S0424820100137458
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
1995
SSG:
11
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