Article ID Journal Published Year Pages File Type
239066 Powder Technology 2007 8 Pages PDF
Abstract

Using activated carbon as templates, Ni coated activated carbon powders were prepared by electroless nickel-plating method. Removing the activated carbon templates, nickel hollow powders were prepared. The prepared Ni coated activated carbon powders and nickel hollow powders were characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), and Field emission scanning electron microscope (FESEM). The results show that most of the activated carbon template could be eliminated at 210 °C in air or at 700 °C in nitrogen without oxidation of most of the coated nickel. The Ni hollow powders heated in air showed more porous than that of annealed in nitrogen. The dielectric and magnetic loss of Ni hollow powders -paraffin wax composites were measured in the frequency range of 2–15 GHz by reflection/transmission way using network analyzer. The reflection coefficient of Ni hollow powders-paraffin wax absorbers with 2 mm thickness was calculated by transmission line theory, the maximum reflection loss can be up to − 16 dB.

Graphical abstractNi hollow powders were prepared by electroless nickel-plating method using activated carbon as templates. The prepared Ni hollow powders were characterized by XRD, SEM and FE-SEM. Most of the activated carbon template could be eliminated at 210 °C in air or at 700 °C in nitrogen. The reflection coefficient of Ni hollow powders-paraffin wax absorbers with 2 mm thickness was calculated, and the maximum reflection loss can be up to − 16 dB.Figure optionsDownload full-size imageDownload as PowerPoint slide

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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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