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Microwave absorption of carbonization temperature-dependent uniform yolk-shell H-Fe3O4@C microspheres

Ma, Wenjun ; He, Peng ; Wang, Tianyi ; Xu, Jian ; Liu, Xiaoyun ; Zhuang, Qixin ; Cui, Zhong-Kai ; Lin, Shaoliang

Chemical engineering journal (Lausanne, Switzerland : 1996), 2021-09, Vol.420, p.129875, Article 129875 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Microwave absorption of carbonization temperature-dependent uniform yolk-shell H-Fe3O4@C microspheres
  • Autor: Ma, Wenjun ; He, Peng ; Wang, Tianyi ; Xu, Jian ; Liu, Xiaoyun ; Zhuang, Qixin ; Cui, Zhong-Kai ; Lin, Shaoliang
  • Assuntos: Carbonization temperature ; Graphitization degree ; Microwave absorption ; Yolk-shell
  • É parte de: Chemical engineering journal (Lausanne, Switzerland : 1996), 2021-09, Vol.420, p.129875, Article 129875
  • Descrição: [Display omitted] •The double-cavity yolk-shell Fe3O4@C microspheres are successfully synthesized.•The optimized reflection loss has reached −58.44 dB with the thickness of 1.9 mm.•Effective bandwidth is 6.0 GHz (12.0–18.0 GHz) covering the whole Ku band.•Carbonization temperature has great influence on impedance matching. Carbon electromagnetic wave (EMW) absorbing materials are often limited in performance improvement due to their excessive conductivity and single loss mechanism. And the introduction of magnetic components with rational construction of microstructure is evolved as an effective approach to reinforcing the electromagnetic properties of carbon-based microwave absorbers. For the first time, a double-cavity yolk-shell hollow Fe3O4@C (H-Fe3O4@C) microwave absorber is fabricated via a “coating–coating–etching” method, by controlled high-temperature carbonization. The resultant carbon shell is actually composed of different contents of amorphous carbon and graphite, which has a powerful influence on the graphitization degree. When H-Fe3O4@C microspheres are carbonized at 650℃, the optimized reflection loss (RL) has reached −58.44 dB and the effective bandwidth is 6.0 GHz (12.0–18.0 GHz) covering the whole Ku band with the thickness of merely 1.9 mm (filler loading: 30 wt%), which is better than most carbon-based absorbing materials reported yet. The outstanding EMW absorbing properties are ascribed to the multiple reflections and scattering arising from the designed double-cavity yolk-shell structure, the multi-interface polarization between Fe3O4/air and C/air, and the good impedance matching relating to the proper carbonization degree of carbon component at 650 °C.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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