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<p>In this paper, silica hydrolyzed by tetraethyl orthosilicate was used as template to synthesize phenolic resin microspheres by resorcinol and formaldehyde. Then, mesoporous hollow carbon microspheres (MHCM) were obtained by etching and high-temperature calcination. The sea urchin-like MHCM@PANI composite absorbing material was prepared by in-situ polymerization of MHCM coated with polyaniline (PANI). The microwave absorption performance of MHCM@PANI composite was evaluated. The minimum reflection loss (RL<sub>min</sub>) was − 49.95dB and the maximum effective absorption bandwidth was 6.03&#xa0;GHz. By adjusting the ratio of MHCM and PANI, the effective electromagnetic wave absorption of X, C and Ku bands can be achieved, and the broadband absorption can be achieved. With low dielectric constant, PANI can effectively adjust the overall dielectric properties of carbon materials, optimize impedance matching, and generate new heterogeneous interfaces, thus improving the wave absorption properties of composite materials. The excellent absorbing performance mainly comes from the combination of good impedance matching characteristics and a variety of loss mechanisms including dielectric loss, multiple reflection scattering and strong interface polarization.</p>

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Preparation and wave absorbing properties of sea urchin-like MHCM@PANI composites

  • 期刊论文

  • 发表日期：

    2026年6月25日

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  • Xiaoqing Yin,
  • Ziyi Zhang,
  • Fan Zhang,
  • Junwu Wen,
  • Fei Yan,
  • Yang Chen

摘要

In this paper, silica hydrolyzed by tetraethyl orthosilicate was used as template to synthesize phenolic resin microspheres by resorcinol and formaldehyde. Then, mesoporous hollow carbon microspheres (MHCM) were obtained by etching and high-temperature calcination. The sea urchin-like MHCM@PANI composite absorbing material was prepared by in-situ polymerization of MHCM coated with polyaniline (PANI). The microwave absorption performance of MHCM@PANI composite was evaluated. The minimum reflection loss (RLmin) was − 49.95dB and the maximum effective absorption bandwidth was 6.03 GHz. By adjusting the ratio of MHCM and PANI, the effective electromagnetic wave absorption of X, C and Ku bands can be achieved, and the broadband absorption can be achieved. With low dielectric constant, PANI can effectively adjust the overall dielectric properties of carbon materials, optimize impedance matching, and generate new heterogeneous interfaces, thus improving the wave absorption properties of composite materials. The excellent absorbing performance mainly comes from the combination of good impedance matching characteristics and a variety of loss mechanisms including dielectric loss, multiple reflection scattering and strong interface polarization.