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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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External field-assisted techniques for polymer matrix composites with electromagnetic interference shielding.

Chaobo Liang1, Hua Qiu2, Yali Zhang2

  • 1Shanxi Key Laboratory of Nano Functional Composites, School of Materials Science and Engineering, North University of China, Taiyuan 030051, China; Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.

Science Bulletin
|August 4, 2023
PubMed
Summary
This summary is machine-generated.

Developing advanced electromagnetic interference (EMI) shielding materials is crucial for mobile devices. This study explores using external fields to orient fillers in polymer composites, enhancing EMI shielding performance and preventing information leakage.

Keywords:
Electromagnetic interference shieldingExternal field-assisted techniqueOrientation structurePolymer matrix composites

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electromagnetics

Background:

  • Mobile device proliferation necessitates high-performance electromagnetic interference (EMI) shielding materials.
  • Information security and electromagnetic radiation suppression are critical concerns.
  • Filler orientation within polymer matrices significantly impacts EMI shielding effectiveness.

Purpose of the Study:

  • To review strategies for constructing conductive networks in polymer composites via external field induction.
  • To organize research on preparing EMI shielding composites by orienting inorganic fillers using external fields.
  • To analyze the structure-property relationships for external field-induced composite materials and their interaction with electromagnetic waves.

Main Methods:

  • Review of existing literature on external field-assisted filler orientation.
  • Categorization of external fields used: temperature, electrostatic, gravity, mechanical, and magnetic.
  • Analysis of composite structures and their electromagnetic wave interaction mechanisms.

Main Results:

  • External field induction offers a promising route for creating ordered filler structures in polymer composites.
  • Various external fields can effectively induce filler orientation, leading to improved EMI shielding.
  • Understanding the interplay between induced structure and electromagnetic wave response is key.

Conclusions:

  • External field induction is a vital strategy for designing high-performance polymer matrix EMI shielding composites.
  • Further research is needed to address key scientific challenges in this area.
  • This work provides guidance for innovative composite design for enhanced EMI shielding.