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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

848
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,...
848

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控制的Twill表面结构 赋予纳米纤维复合膜 优秀的电磁干扰屏蔽

Dechang Tao1, Xin Wen1,2, Chenguang Yang3

  • 1Key Laboratory of Textile Fiber and Products (Wuhan Textile University), Ministry of Education, Wuhan Textile University, Wuhan, 430200, People's Republic of China.

Nano-micro letters
|July 4, 2024
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概括

一种新型的复合膜,采用以中国 Knotting 技术为灵感的 twill 表面,通过使用低填料含量,实现高电磁干扰屏蔽效率 (103.9 dB). 这种创新的设计提高了EMI屏蔽性能和材料强度.

关键词:
电磁干扰是一种电磁干扰.灵活性和机械特性.在MXene/AgNWNW中.纳米纤维膜膜的使用方法双的表面结构结构.

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科学领域:

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

背景情况:

  • 电磁干扰 (EMI) 屏蔽材料对于保护电子设备至关重要.
  • 开发轻量级,高性能,含有低填充剂的EMI屏蔽材料仍然是一个挑战.

研究的目的:

  • 设计和制造一种新型的纳米纤维复合膜,具有状表面结构,用于增强EMI屏蔽.
  • 为了研究螺纹结构对EMI屏蔽性能和复合膜的机械性能的影响.

主要方法:

  • 使用模板方法制备聚乙醇-共乙烯-MXene/银纳米线 (Pva-co-PE-MXene/AgNW) 复合膜.
  • 使用TWILL尼龙织物作为过模板来创建一个表面TWILL结构.
  • 关于EMI屏蔽效率 (SE),拉力强度,热管理,疏水性和不易燃性的表征.

主要成果:

  • 表面状结构的PM$_{7.4}$Ag膜在仅7.4重%的MXene/AgNW含量下实现了103.9dB的EMI SE.
  • 双结构通过增强的预干扰和内部反射/损失,提高了38.5%的EMI屏蔽.
  • 复合膜具有出色的抗拉强度 (22.8 MPa) 和高的EMI SE/t (3925.2 dB cm$^{-1}$).
  • 该材料表现出优异的热处理,疏水性,不易燃性和高达140°C的稳定性.

结论:

  • 表面的复合膜设计有效地提高了EMI屏蔽性能在低度的填充剂.
  • 这一战略为开发薄而高性能EMI屏蔽材料提供了新的途径.
  • 开发的膜显示了需要强大的电磁屏蔽和热管理的应用的潜力.