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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,...
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Tunable High-Performance Electromagnetic Interference Shielding of VO2 Nanowires-Based Composite.

Shuhui Liang1, Huan Guan2, Hainan Zhang1

  • 1School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, China.

ACS Applied Materials & Interfaces
|April 12, 2024
PubMed
Summary

This study presents a novel composite material using vanadium dioxide (VO2) nanowires in a polymer matrix for switchable electromagnetic interference (EMI) shielding. The material demonstrates dynamic control over EM response, offering potential for advanced smart electromagnetic devices.

Keywords:
VO2 NWselectromagnetic interference shieldingintelligent electromagnetic responsemetal−insulator transitionoff/on switchable

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Nanotechnology

Background:

  • Vanadium dioxide (VO2) exhibits a unique metal-insulator transition (IMT) with significant changes in electrical conductivity.
  • This property makes VO2 suitable for dynamic electromagnetic (EM) regulation applications.

Purpose of the Study:

  • To develop an off/on switchable electromagnetic interference (EMI) shielding composite material.
  • To investigate the mechanism behind the dynamic EM shielding performance.
  • To evaluate the material's stability and mechanical properties.

Main Methods:

  • Interconnecting VO2 nanowires (NWs) within a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrix.
  • Forming conductive networks to enable switchable shielding.
  • Characterizing EM shielding performance at X and Ku bands.
  • Assessing cycling stability and mechanical properties, including abrasion resistance.

Main Results:

  • Achieved outstanding EMI shielding performance with maximum changes of 44.8 dB (X band) and 59.4 dB (Ku band).
  • Demonstrated that VO2 NWs' IMT governs polarization and conductivity losses, enabling the off/on switching mechanism.
  • Exhibited good cycling stability and excellent mechanical properties, including 200-cycle abrasion resistance.

Conclusions:

  • The developed composite offers a unique approach for dynamic EM response switching.
  • The material shows potential for constructing practical intelligent EM response systems.
  • This work paves the way for next-generation smart electromagnetic devices.