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Enhanced electromagnetic wave dissipation features of magnetic Ni microspheres by developing core-double shells structure

Zhang, B ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2021.09.120
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. Readily oxidization of magnetic particles is a common drawback of these type of materials which reduce their electromagnetic wave dissipation performance. In this study, the magnetic core-double shells structured (Ni/SiO2/Polyaniline) composite has been developed for protection of the core from oxidation and in consequent improvement the complex permittivity. Solvothermal and in-situ polymerization methods were utilized for decorating Ni micro-particles with SiO2 and conductive polyaniline polymer respectively. All physico-chemical, magnetic and electromagnetic features were evaluated via XRD, FTIR, XPS, FESEM, VSM and VNA analysis. The double shells composite possesses significant performance in terms of reflection loss and effective absorption bandwidth. The results reveal that the maximum dissipation capacity of the double shells composite is – 32.5 dB at 16.5 GHz with 4.5 GHz effective absorption bandwidth and 1.5 mm thickness. Enhancement in microwave dissipation features are arises from synergistic influence of various phenomena such as interfacial polarization, multiple Debye relaxation, natural ferromagnetic resonance and proper impedance matching characteristic. Overall, developing double shells structure on magnetic Ni microsphere particles had a meaningful effect on tuning the microwave absorption performance. © 2021 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Core/shell structure ; Microwave absorption ; Ni@SiO2 ; PANI ; Bandwidth ; Chemical analysis ; Circular waveguides ; Electric network analyzers ; Electromagnetic waves ; Heat transfer ; Microspheres ; Silica ; Silicon ; Core shell structure ; Double shells ; Effective absorption ; Ni/SiO 2 ; Oxidization ; Performance ; Shell structure ; Wave dissipation ; Shells (structures)
  8. Source: Ceramics International ; Volume 48, Issue 1 , 2022 , Pages 446-454 ; 02728842 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S027288422102914X