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Related Concept Videos

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

839
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,...
839

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Related Experiment Video

Updated: Jun 6, 2025

Disentangling High Strength Copolymer Aramid Fibers to Enable the Determination of Their Mechanical Properties
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Structural-Functional Integrated Graphene-Skinned Aramid Fibers for Electromagnetic Interference Shielding.

Quanfen Guo1,2, Huahui Tian2,3, Yao Cheng2

  • 1School of Materials Science and Engineering, Peking University, Beijing 100871, China.

ACS Nano
|November 27, 2024
PubMed
Summary

We developed graphene-skinned aramid fibers (GRAF) for advanced technologies. These lightweight, strong, and conductive GRAF fabrics offer excellent electromagnetic interference shielding and heating capabilities.

Keywords:
aramid polyaniondip-coating strategyelectromagnetic interference shieldinggraphene-skinned aramid fiberstructural−functional integration

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Advanced polymer fibers are crucial for next-generation technologies.
  • Developing materials with integrated structural and functional properties is a key research area.
  • Electromagnetic interference (EMI) shielding and thermal management are critical applications for functional fibers.

Purpose of the Study:

  • To create a structural-functional integrated graphene-skinned aramid fiber (GRAF).
  • To investigate the self-assembly mechanism of graphene onto aramid fibers.
  • To evaluate the EMI shielding, mechanical, thermal, and washing resistance properties of the GRAF fabric.

Main Methods:

  • Graphene self-assembly onto aramid fibers via dip-coating using aramid polyanion (APA) as binder and etchant.
  • Molecular dynamics (MD) simulations to study binding energy and surface interactions.
  • Fabrication of GRAF fabric and characterization of its electrical conductivity, mechanical strength, EMI shielding efficiency, and thermal properties.

Main Results:

  • GRAF exhibits high conductivity (1062.04 ± 116.78 S/m), strength (4.66 ± 0.16 GPa), and modulus (106.33 ± 8.21 GPa).
  • APA enhances graphene binding energy (1.3 J/m2) and enables effective graphene self-assembly.
  • Weaved GRAF fabric achieves high EMI shielding efficiency (up to 67.86 dB) and rapid heating (200 °C in 40 s).
  • GRAF fabric demonstrates excellent washing resistance, maintaining electrical conductivity after prolonged washing.

Conclusions:

  • A novel method for fabricating structural-functional integrated GRAF was demonstrated.
  • GRAF shows superior performance compared to other conductive composite fibers.
  • The developed GRAF fabric holds significant promise for EMI shielding and thermal management applications.