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WANG Weina, HUANG Hao, ZHANG Xuefeng, et al. Preparation of SiO2 / Ni core-shell structured nanoparticles and their magnetic properties[J]. Acta Materiae Compositae Sinica, 2007, 24(3): 131-135.
Citation: WANG Weina, HUANG Hao, ZHANG Xuefeng, et al. Preparation of SiO2 / Ni core-shell structured nanoparticles and their magnetic properties[J]. Acta Materiae Compositae Sinica, 2007, 24(3): 131-135.
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Preparation of SiO2 / Ni core-shell structured nanoparticles and their magnetic properties

  • State Key Laboratory of Materials Modification by Laser, Ion and Elect ron Beams, School ofMaterials Science and Engineering of Dalian University of Technology, Dalian 116023, China

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  • Received Date: July 16, 2006
  • Revised Date: October 22, 2006
    Abstract
  • Magnetic Ni nanoparticles coated with silica were successfully synthesized via the liquid deposition methodusing Na2SiO3 as the main raw material , and their st ructures and properties were studied by X-ray diff raction(XRD) , Fourier t ransform inf rared spect rometer ( FTIR) , t ransmission elect ron microscopy ( TEM) , thermogravimet ric analysis ( TGA) , differential scanning calorimet ry (DSC) and vibrating sample magnetometer (VSM) . XRD ,FTIR and TEM result s show that there is noncrystal silica on the surface of Ni nanoparticles and it prevents the nanoparticles f rom agglomerating. The oxidation resistance of SiO2 / Ni nanoparticles is improved because of the protection of the silica coating. Magnetic properties show that Ni and SiO2 / Ni are ferromagnetic materials. The hysteresisloop of Ni has an excursion because of the anti-ferromagnetic NiO. The silica coating reduces the saturation magnetization and improves the coercivity.
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