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Journal of Nanomaterials
Volume 2013 (2013), Article ID 427489, 6 pages
http://dx.doi.org/10.1155/2013/427489
Research Article

Synthesis and Magnetic Properties of Ni and Carbon Coated Ni by Levitational Gas Condensation (LGC)

1Radioisotope Research Division, Korea Atomic Energy Research Institute, 989 Daedukdaero, Daejeon 305-353, Republic of Korea
2Nuclear Materials Development Research Division, Korea Atomic Energy Research Institute, 989 Daedukdaero, Daejeon 305-353, Republic of Korea

Received 6 March 2013; Revised 21 June 2013; Accepted 22 June 2013

Academic Editor: Takeshi Seki

Copyright © 2013 Young Rang Uhm and Chang Kyu Rhee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The nickel (Ni), and carbon coated nickel (Ni@C) nanoparticles were synthesized by levitaional gas condensation (LGC) methods using a micron powder feeding (MPF) system. Both metal and carbon coated metal nano powders include a magnetic ordered phase. The synthesis by LGC yields spherical particles with a large coercivity. The abnormal initial magnetization curve for Ni indicates a non-collinear magnetic structure between the core and surface layer of the particles. The carbon coated particles had a core structure diameter at and below 10 nm and were covered by 2-3 nm thin carbon layers. The hysteresis loop of the as-prepared Ni@Cs materials with unsaturated magnetization shows a superparamagnetic state at room temperature.