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Related Concept Videos

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,...
848

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Related Experiment Video

Updated: Jun 22, 2025

Procedure for Fabricating Biofunctional Nanofibers
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Controlled Twill Surface Structure Endowing Nanofiber Composite Membrane Excellent Electromagnetic Interference

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
PubMed
Summary

A novel composite membrane with a Chinese Knotting-inspired twill surface achieves high electromagnetic interference shielding efficiency (103.9 dB) using low filler content. This innovative design enhances EMI shielding performance and material strength.

Keywords:
Electromagnetic interferenceFlexibility and mechanical propertiesMXene/AgNWNanofiber membraneTwill surface structure

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Electromagnetic interference (EMI) shielding materials are crucial for protecting electronic devices.
  • Developing lightweight, high-performance EMI shielding materials with low filler content remains a challenge.

Purpose of the Study:

  • To design and fabricate a novel nanofiber composite membrane with a twill surface structure for enhanced EMI shielding.
  • To investigate the effect of the twill structure on the EMI shielding performance and mechanical properties of the composite membrane.

Main Methods:

  • Preparation of Poly(vinyl alcohol-co-ethylene)-MXene/silver nanowire (Pva-co-PE-MXene/AgNW) composite membranes using a template method.
  • Utilizing twill nylon fabric as a filter template to create a surface twill structure.
  • Characterization of EMI shielding efficiency (SE), tensile strength, thermal management, hydrophobicity, and non-flammability.

Main Results:

  • The PM$_{7.4}$Ag membrane with a surface twill structure achieved an EMI SE of 103.9 dB at only 7.4 wt% MXene/AgNW content.
  • The twill structure improved EMI shielding by 38.5% through enhanced pre-interference and internal reflection/losses.
  • The composite membrane exhibited excellent tensile strength (22.8 MPa) and high EMI SE/t (3925.2 dB cm$^{-1}$).
  • The material demonstrated excellent thermal management, hydrophobicity, non-flammability, and stability up to 140 °C.

Conclusions:

  • The surface-twill composite membrane design effectively enhances EMI shielding performance at low filler concentrations.
  • This strategy offers a new pathway for developing thin, high-performance EMI shielding materials.
  • The developed membranes show potential for applications requiring robust electromagnetic shielding and thermal management.