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Ni coated cenosphere composites are successfully fabricated by heterogeneous precipitation method using metal salts, ammonium hydro-carbonate and cenospheres as the raw materials. The cenosphere particles are characterized by scanning electron microscope (SEM)/energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) during and after the coating process. All results show that relatively uniform, smooth and compact Ni layer has been successfully coated onto cenospheres under the given conditions, furthermore, the nanometer Ni crystallite has a face-centered cubic structure. Magnetic property of Ni coated cenosphere composites can be adjusted by controlling the synthesis conditions and content of magnetic metal. The low density Ni coated cenosphere composites may be utilized for electromagnetic wave shielding and microwave absorbing materials.  相似文献
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采用电化学沉积Ag的方法对多孔硅表面进行钝化改善其发光性能,探讨了沉积电流密度大小与沉积Ag的形式以及多孔硅表面亲水性处理对沉积Ag均匀性的影响. 结果表明,改变沉积电流密度大小后出现了两个临界电流密度,即不发生Ag沉积和在PS表层形成Ag电镀,深入PS孔道内沉积Ag的电流密度范围为50~400 A/cm2;多孔硅表面亲水性处理对沉积Ag均匀性有积极作用,在相同的实验条件下,未经表面亲水性处理的疏水多孔硅表面沉积Ag不均匀,而经过SC-1溶液处理后的亲水多孔硅表面上沉积Ag分布较均匀. 进一步研究了均匀沉积Ag钝化处理对PS的光致发光强度和稳定性的影响,证明采用Ag钝化处理能有效地抑制发光强度的衰减;而过量的Ag沉积会使PS发生荧光猝灭现象.  相似文献
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