Particle Size Effects on Complex Permeability and Electromagnetic Wave Absorption Properties of Amorphous Alloy-Epoxy Composites

2007 ◽  
Vol 539-543 ◽  
pp. 1022-1027
Author(s):  
Kyoung Mook Lim ◽  
Moon Chul Kim ◽  
Chan Gyung Park ◽  
Y.M. Hong
Keyword(s):  
Particle Size ◽  
Electromagnetic Wave ◽  
Amorphous Alloy ◽  
Magnetic Relaxation ◽  
Epoxy Composites ◽  
Complex Permeability ◽  
Frequency Variation ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption

The electromagnetic wave absorption properties of amorphous alloy-epoxy composites have been investigated utilizing various amorphous alloy particle sizes in quasi-microwave frequency. The composite fabricated with small sized particle (< 26 μm) only revealed good absorption properties above 20dB with a thin thickness less than 6 mm. As particle size decreased, absorber had thinner matching thickness mainly due to increasing matching frequency. Such a variation of matching frequency was resulted from resonance frequency variation. The magnetic relaxation of the composites with small particle (< 38 μm) was contributed to magnetic resonance induced by demagnetization field. The eddy current also affected on the magnetic relaxation of the composites with large particle (> 38 μm) due to their large conductivity.

ZnS nanowall coated Ni composites: facile preparation and enhanced electromagnetic wave absorption

RSC Advances ◽  
2014 ◽  
Vol 4 (105) ◽  
pp. 61219-61225 ◽  
Author(s):  
Biao Zhao ◽  
Gang Shao ◽  
Bingbing Fan ◽  
Wanyu Zhao ◽  
Yajun Xie ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Microwave Absorption ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Facile Preparation

The microwave absorption properties of ultrathin ZnS wall-coated Ni composites were superior to those of Ni microspheres and ZnS particles.

scholarly journals Enhanced electromagnetic wave absorption property of binary ZnO/NiCo2O4 composites

2021 ◽  
Author(s):  
Bin Du ◽  
Mei Cai ◽  
Xuan Wang ◽  
Junjie Qian ◽  
Chao He ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Dielectric Properties ◽  
Hydrothermal Reaction ◽  
Absorption Property ◽  
Absorption Properties ◽  
Promising Candidate ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Absorbing Materials ◽  
Minimum Reflection Loss

AbstractNowadays, metal oxide-based electromagnetic wave absorbing materials have aroused widely attentions in the application of telecommunication and electronics due to their selectable mechanical and outstanding dielectric properties. Herein, the binary ZnO/NiCo2O4 nanoparticles were successfully synthesized via hydrothermal reaction and the electromagnetic wave absorption properties of the composites were investigated in detail. As a result, benefiting from the dielectric loss, the as-obtained ZnO/NiCo2O4-7 samples possessed a minimum reflection loss value of −33.49 dB at 18.0 GHz with the thickness of 4.99 mm. This work indicates that ZnO/NiCo2O4 composites have the promising candidate applications in electromagnetic wave absorption materials in the future.

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