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<p>To investigate the electromagnetic wave absorption performance of electromagnetic-regulated materials and copolymerized composite aerogels with polymer materials, this study loaded nano-Fe<sub>3</sub>O<sub>4</sub> onto modified CNTs through a hydrothermal reaction. The resulting material was then added to a prepolymer solution of acrylic acid and acrylamide monomers for copolymerization, followed by the preparation of composite aerogels using freeze-drying technology (Fe<sub>3</sub>O<sub>4</sub>-CNTs/P(AA-AM)). The influence of the addition amount of nano-Fe<sub>3</sub>O<sub>4</sub>-loaded modified CNTs on the electromagnetic wave absorption performance of the composite aerogels was systematically studied. Notably, the Fe<sub>3</sub>O<sub>4</sub>-CNTs/P(AA-AM)-5 aerogel exhibited the optimal wave-absorbing performance, achieving a minimum reflection loss of −35.5&#xa0;dB and an effective absorption bandwidth of 5.04&#xa0;GHz below −10&#xa0;dB. This is primarily attributed to the excellent dual electromagnetic loss of Fe<sub>3</sub>O<sub>4</sub>-CNTs and the multiple reflection, polarization, and relaxation processes induced by the three-dimensional conductive network constructed within the aerogel skeleton. The performance relationships revealed in this study are of significant importance for the design and preparation of polymer aerogels with effective electromagnetic wave absorption capabilities.</p>

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Freeze-dried Fe₃O₄-CNTs/P(AA-AM) composite aerogels: microstructure regulation and microwave absorption mechanism

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Yiting Guo,
  • Jingyi Hao,
  • Tian Wang,
  • Shen Su,
  • Shuangshuang Yang,
  • Xingwei Wang,
  • Qiangliang Yu

摘要

To investigate the electromagnetic wave absorption performance of electromagnetic-regulated materials and copolymerized composite aerogels with polymer materials, this study loaded nano-Fe3O4 onto modified CNTs through a hydrothermal reaction. The resulting material was then added to a prepolymer solution of acrylic acid and acrylamide monomers for copolymerization, followed by the preparation of composite aerogels using freeze-drying technology (Fe3O4-CNTs/P(AA-AM)). The influence of the addition amount of nano-Fe3O4-loaded modified CNTs on the electromagnetic wave absorption performance of the composite aerogels was systematically studied. Notably, the Fe3O4-CNTs/P(AA-AM)-5 aerogel exhibited the optimal wave-absorbing performance, achieving a minimum reflection loss of −35.5 dB and an effective absorption bandwidth of 5.04 GHz below −10 dB. This is primarily attributed to the excellent dual electromagnetic loss of Fe3O4-CNTs and the multiple reflection, polarization, and relaxation processes induced by the three-dimensional conductive network constructed within the aerogel skeleton. The performance relationships revealed in this study are of significant importance for the design and preparation of polymer aerogels with effective electromagnetic wave absorption capabilities.