Synthesis and characterization of Co/cenosphere core–shell structure composites

► Co coated cenosphere composites are successfully fabricated by heterogeneous precipitation thermal reduction method using metal salts, ammonium hydro-carbonate and cenospheres as starting reagents for the first time. ► Relatively uniform, smooth and compact Co coating has been successfully coated...

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Bibliographic Details
Published in:Applied surface science 2012-01, Vol.258 (7), p.2627-2631
Main Authors: Meng, Xian-Feng, Shen, Xiang-Qian, Liu, Wei
Format: Article
Language:English
Subjects:
Cenospheres
Composite materials
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Crystallites
Diffraction
Exact sciences and technology
Fly-ash cenosphere
Heterogeneous precipitation thermal reduction
Iron
Magnetic properties
Nano-Co
Nanoparticles
Particulate composites
Physics
Precipitation
Thermal reduction
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Summary:► Co coated cenosphere composites are successfully fabricated by heterogeneous precipitation thermal reduction method using metal salts, ammonium hydro-carbonate and cenospheres as starting reagents for the first time. ► Relatively uniform, smooth and compact Co coating has been successfully coated onto cenospheres, and the grain size is about 24.5nm. ► The magnetic properties of Co coated cenosphere composites are affected by core layer. The cobalt film was successfully coated on the cenosphere particles using heterogeneous precipitation thermal reduction method. The morphology and microstructure of the products were analyzed by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). FE-SEM results implied that the Co film was relatively uniform and compact. XRD results indicated that the Co film coated on cenospheres was a face-centered cubic structure (fcc) and the crystallite size of Co particles was about 24.5nm. The magnetic property of Co/cenosphere composites was measured by vibrating sample magnetometer (VSM), and the results showed that the Co/cenosphere composites were of the weak soft magnetic property at room temperature, the Ms and Hc value was 18.2Am2kg−1 and 28.4kAm−1, respectively.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2011.10.108