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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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Green Electromagnetic Interference Shielding Material Based on Thermally Expandable Microspheres.

Yang Zhou^1,2, 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

Summary

New green electromagnetic interference (EMI) shielding materials use thermally expandable microspheres and expanded graphite to absorb, not reflect, harmful electromagnetic waves, offering improved protection.

Keywords:

electromagnetic interference shielding expanded graphite thermally expandable microspheres

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Area of Science:

Materials Science
Electromagnetics
Nanotechnology

Background:

Growing electromagnetic pollution necessitates advanced electromagnetic interference (EMI) shielding solutions.
Existing EMI materials often cause secondary reflection pollution, limiting their environmental friendliness.
There is a need for absorption-dominated EMI shielding materials, termed 'green EMI materials'.

Purpose of the Study:

To develop absorption-dominated EMI shielding materials using thermally expandable microspheres (TEMs) and expanded graphite (EG).
To investigate the effect of TEMs and EG on impedance matching and shielding effectiveness.
To evaluate the stability and performance of the developed green EMI materials.

Main Methods:

Preparation of a composite material using TEMs and EG within a waterborne polyurethane matrix.
Tuning the content of TEMs and EG to optimize material properties.
Testing electromagnetic interference shielding effectiveness (SE) and average reflection power coefficient.
Assessing material stability through compression-recovery tests.

Main Results:

A composite with 5 wt % TEMs and 15 wt % EG achieved an EMI SE of 38.4 dB.
The composite demonstrated a low average reflection power coefficient of 0.27, indicating absorption-dominated shielding.
The material maintained excellent EMI SE and low reflection power after compression-recovery tests, showing good stability.

Conclusions:

The proposed method successfully creates absorption-dominated EMI shielding materials (green EMI materials).
Optimized impedance matching through TEM expansion enhances shielding performance.
The developed materials offer a stable and effective solution for mitigating electromagnetic pollution.