Preparation of (Ni-B)/SiO2, Ni/SiO2 and NiO/SiO2 nanocomposites Article uri icon


  • In this work we report composites of nickel-boron (Ni-B)/SiO2, Ni3B/SiO2, Ni/SiO2 and NiO/SiO2. As precursor of the nickel compounds, we used nanometric amorphous Ni-B alloy particles. The nanometric Ni-B particles were prepared by aqueous chemical reduction and studied by transmission electron microscopy (TEM), differential thermal analysis (DTA) and X-ray diffraction (XRD) before their incorporation into the SiO2 xerogel. The composite samples were prepared by the sol-gel method. The produced samples were ground to form powders, heat treated at different temperatures under atmospheric conditions and characterized by TEM, XRD and DTA techniques. A specific composite (Ni3B/SiO2, NiO/SiO2, Ni/SiO2, (Ni-B)/SiO2) can be produced depending on the temperature used for reaction. Composites were stable at room temperature and there were no significant phase transformations under aging. © 2002 Elsevier Science B.V. All rights reserved.

publication date

  • 2003-01-01