Scholarlink

<p>At present, the development of high-efficiency electromagnetic wave (EMW) absorbing materials has received close attention. The preparation of carbon microspheres with high polymer is relatively mature, simple, and has good structural designability. In this paper, hollow carbon mesoporous microspheres (HCMS) with homogeneous mesoporous shells were prepared by using silica as template and phenolic resin as carbon matrix. The results show that different states of hollow mesoporous carbon microspheres can be obtained by changing different preparation parameters, including cavity diameter, overall size, shell layer thickness, and mesoporous distribution. The results show that the absorption performance of the HCMS is the best when the template agent is TPOS, ethanol–water ratio is 55: 7 and slow adding time is 120&#xa0;min. The minimum reflection loss (RL<sub>min</sub>) is −&#xa0;45.33&#xa0;dB at a loading of 5wt% and a thickness of 3.5&#xa0;mm, and the maximum effective absorption bandwidth (EAB<sub>max</sub>) reaches 6.5&#xa0;GHz at a thickness of 2.5&#xa0;mm. HCMS can be considered as an ideal electromagnetic wave absorber, which has the characteristics of strong absorption, light weight, broadband, and thin thickness.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on ultra-light hollow carbon microspheres with adjustable structure and the electromagnetic wave-absorbing properties

  • 期刊论文

  • 发表日期：

    2025年6月14日

查看全文
  • Ziyi Zhang,
  • Meihua Li,
  • Fuhou Huang,
  • Fei Yan,
  • Yang Chen

摘要

At present, the development of high-efficiency electromagnetic wave (EMW) absorbing materials has received close attention. The preparation of carbon microspheres with high polymer is relatively mature, simple, and has good structural designability. In this paper, hollow carbon mesoporous microspheres (HCMS) with homogeneous mesoporous shells were prepared by using silica as template and phenolic resin as carbon matrix. The results show that different states of hollow mesoporous carbon microspheres can be obtained by changing different preparation parameters, including cavity diameter, overall size, shell layer thickness, and mesoporous distribution. The results show that the absorption performance of the HCMS is the best when the template agent is TPOS, ethanol–water ratio is 55: 7 and slow adding time is 120 min. The minimum reflection loss (RLmin) is − 45.33 dB at a loading of 5wt% and a thickness of 3.5 mm, and the maximum effective absorption bandwidth (EABmax) reaches 6.5 GHz at a thickness of 2.5 mm. HCMS can be considered as an ideal electromagnetic wave absorber, which has the characteristics of strong absorption, light weight, broadband, and thin thickness.