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首页> 外文期刊>RSC Advances >Dopamine-derived cavities/Fe3O4 nanoparticles-encapsulated carbonaceous composites with self-generated three-dimensional network structure as an excellent microwave absorber
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Dopamine-derived cavities/Fe3O4 nanoparticles-encapsulated carbonaceous composites with self-generated three-dimensional network structure as an excellent microwave absorber

机译：多巴胺衍生的空腔/ Fe3O4纳米颗粒包封碳质复合材料，具有自成的三维网络结构，作为优异的微波吸收器

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摘要

Dopamine-derived cavities/Fe3O4 nanoparticles-encapsulated carbonaceous composites with self-generating three-dimensional (3D) network structure were successfully fabricated by a facile synthetic method, in which sodium alginate provided carbon matrix pores and excellent microwave absorption performance was established. The hollow cavities derived from the core-shell-like CaCO3@polydopamine were creatively introduced into the 3D absorber to significantly improve the absorption performance. The sample calcined at 700 degrees C exhibited the most outstanding microwave absorption performance, with minimal reflection loss up to -50.80 dB at 17.52 GHz with a rare thickness of only 1.5 mm when filler loading was 35% in paraffin matrix. The effective absorption bandwidth of reflection loss < -10 dB reached 3.52 GHz from 14.48 GHz to 18 GHz, corresponding to the same thickness of 1.5 mm. In contrast, the sample without hollow dopamine-derived cavities showed poor performance due to poor impedance matching, and this highlights the role of hollow cavities brought into the 3D structure, which led to a difference in interfacial polarization, multiple reflections and scattering. The novel dopamine-derived cavities/Fe3O4 nanoparticles-encapsulated carbonaceous composites with 3D network structure can be regarded as a promising candidate for application as a microwave absorber with strong absorption.
机译：通过容易合成方法成功地制造了多巴胺衍生的空腔/ Fe3O4纳米颗粒 - 包封的碳质复合材料，其具有自成的三维（3D）网络结构，其中藻酸钠提供了碳基质孔和优异的微波吸收性能。衍生自核壳状CaCO3 @聚二胺的中空空腔被创造地引入到3D吸收器中，以显着提高吸收性能。在700摄氏度下煅烧的样品表现出最优异的微波吸收性能，最小的反射损耗高达-50.80dB，17.52GHz，当填充物载荷在石蜡基质中填料载荷为35％时，稀有厚度为1.5mm。反射损耗的有效吸收带宽<-10dB达到3.52GHz，从14.48GHz到18 GHz，相当于相同的1.5毫米。相反，没有中空多巴胺衍生的空腔的样品表现出由于阻抗匹配差而具有差的性能，这突出了所带入3D结构的中空腔的作用，这导致界面极化，多次反射和散射的差异。具有3D网络结构的新型多巴胺衍生的空腔/ Fe3O4纳米颗粒 - 包封的碳质复合材料可以被认为是应用作为具有强吸收的微波吸收器的有希望的候选者。

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  • 来源
    《RSC Advances》 |2019年第2期|共15页
  • 作者

    Guo Lin; Gao Sheng-Shuai; An Qing-Da; Xiao Zuo-Yi; Zhai Shang-Ru; Yang Dong-Jiang; Cui Li;

  • 作者单位

    Dalian Polytech Univ Fac Light Ind &

    Chem Engn Dalian 116034 Peoples R China;

    Dalian Polytech Univ Fac Light Ind &

    Chem Engn Dalian 116034 Peoples R China;

    Dalian Polytech Univ Fac Light Ind &

    Chem Engn Dalian 116034 Peoples R China;

    Dalian Polytech Univ Fac Light Ind &

    Chem Engn Dalian 116034 Peoples R China;

    Dalian Polytech Univ Fac Light Ind &

    Chem Engn Dalian 116034 Peoples R China;

    Qingdao Univ Collaborat Innovat Ctr Marine Biomass Fibers Mat Sch Environm Sci &

    Engn Qingdao 266071 Peoples R China;

    Dalian Polytech Univ Fac Light Ind &

    Chem Engn Dalian 116034 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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