Journal
CHEMICAL ENGINEERING RESEARCH & DESIGN
Volume 86, Issue 8A, Pages 904-908Publisher
INST CHEMICAL ENGINEERS
DOI: 10.1016/j.cherd.2008.02.006
Keywords
cobalt and nickel nanoparticles; carbon encapsulation; starch; magnetic behavior; formation mechanism
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Funding
- Program for New Century Excellent Talents in Chinese Universities [NCET-04-0274]
- Natural Science Foundation of Liaoning Province of China [3040009]
- National Natural Science Foundation of China [50772017, 20725619]
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Carbon-encapsulated cobalt and nickel nanoparticles with core/shell structure have been successfully synthesized with maize-derived starch as carbon source and metal nitrate as metal precursors in flowing hydrogen. The as-prepared M@Cs materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction technique (XRD) and vibrating sample magnetometer (VSM). The effects of the metal precursors on the structure and the size of the M@Cs materials were investigated, and the magnetic properties of the M@Cs materials were measured. The results show that the structure and the size of the M@Cs materials are different in terms of the different metal precursors. The Co@Cs materials are made of the fcc-Co core and the graphitic carbon shell, of which the core diameter is in a range of 20-35 nm, while the Ni@Cs materials are composed of fcc-Ni core and the amorphous carbon shell, of which the core diameter ranges from 30 to 50 nm. The hysteresis loops of the as-made M@Cs materials show that some of the nanoparticles are in a superparamagnetic state at room temperature. A mechanism is proposed to explain the growth process of the M@Cs materials. It is believed that the starch with the helical structure is responsible for the formation of the M@Cs materials featuring the core/shell structure. (C) 2008 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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