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相关概念视频

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
845

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绿色电磁干扰屏蔽材料基于热可扩展的微球.

Yang Zhou1,2, Yamin Pan2, Qiang Chen1

  • 1State Key Laboratory of Solidification Processing, Northwestern Polytechnic University, Xi'an 710072, P. R. China.

ACS applied materials & interfaces
|August 23, 2024
PubMed
概括

新的绿色电磁干扰 (EMI) 屏蔽材料使用可热扩展的微球和扩展石墨来吸收,而不是反射有害的电磁波,提供更好的保护.

关键词:
电磁干扰屏蔽 电磁干扰屏蔽扩展石墨的使用热可扩展的微球.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电磁学 电磁学 电磁学 电磁学
  • 纳米技术 纳米技术

背景情况:

  • 越来越多的电磁污染需要先进的电磁干扰 (EMI) 屏蔽解决方案.
  • 现有的EMI材料往往会导致二次反射污染,限制它们的环保性.
  • 需要吸收主导的EMI屏蔽材料,称为"绿色EMI材料".

研究的目的:

  • 使用可热扩展微球 (TEM) 和扩展石墨 (EG) 开发吸收主导的EMI屏蔽材料.
  • 调查TEM和EG对阻抗匹配和屏蔽有效性的影响.
  • 评估开发的绿色EMI材料的稳定性和性能.

主要方法:

  • 使用TEM和EG在水性聚氨矩阵内制备复合材料.
  • 调整TEM和EG的内容以优化材料属性.
  • 测试电磁干扰屏蔽效率 (SE) 和平均反射功率系数.
  • 通过压缩恢复测试来评估材料稳定性.

主要成果:

  • 一个含有5重%TEM和15重%EG的复合物获得了38.4dB的EMI SE.
  • 复合材料显示了0.27的低平均反射功率系数,表明吸收占主导地位的屏蔽.
  • 该材料在压缩回收测试后保持了出色的EMI SE和低反射功率,显示出良好的稳定性.

结论:

  • 提出的方法成功地产生了吸收主导的EMI屏蔽材料 (绿色EMI材料).
  • 通过TEM扩展优化阻抗匹配可以提高屏蔽性能.
  • 开发的材料为减轻电磁污染提供了稳定有效的解决方案.