scholarly journals Preparation of Ni/C porous fibers derived from jute fibers for high-performance microwave absorption

RSC Advances ◽  
2020 ◽  
Vol 10 (60) ◽  
pp. 36644-36653
Author(s):  
Wanxi Li ◽  
Fang Guo ◽  
Xiaoqin Wei ◽  
Yien Du ◽  
Yongqiang Chen
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Jute Fibers ◽  
Absorption Performance ◽  
Porous Fibers ◽  
Microwave Absorption Performance

Ni/C porous fibers derived from jute fibers exhibited excellent microwave absorption performance.

Waxberry-like hierarchical Ni@C microspheres with high-performance microwave absorption

2019 ◽  
Vol 7 (17) ◽  
pp. 5037-5046 ◽  
Author(s):  
Dawei Liu ◽  
Yunchen Du ◽  
Ping Xu ◽  
Na Liu ◽  
Yahui Wang ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Hierarchical Architecture ◽  
Core Shell ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Hierarchical architecture and core–shell configuration synergistically endowed waxberry-like Ni@C microspheres with an upgraded microwave absorption performance.

scholarly journals Improved impedance matching by multi-componential metal-hybridized rGO toward high performance of microwave absorption

2021 ◽  
Vol 10 (1) ◽  
pp. 1-9
Author(s):  
Jinlong Xie ◽  
Hunan Jiang ◽  
Jinyang Li ◽  
Fei Huang ◽  
Ahsan Zaman ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Impedance Matching ◽  
Design And Synthesis ◽  
Microwave Absorbing Materials ◽  
Reduced Graphene ◽  
Military Applications ◽  
Absorption Performance ◽  
Microwave Absorption Performance ◽  
Minimum Reflection Loss

Abstract Microwave-absorbing materials with good microwave absorption performance are of great interest for military applications and human health, which is threatened by electromagnetic radiation pollution. Herein, the design and synthesis of multi-componential metal-hybridized graphene composites via freeze drying and pyrolysis of ferrocene hydrazone complex precursor are reported. Various magnetic nanoparticles are loaded on reduced graphene oxide (rGO) via controlling their pyrolysis temperature. The complex electromagnetic parameters of these hybrids are therefore regulated by the hybrid components. Among them, rGO hybridized by the sea-island-like Fe2O3/Fe3O4/FeNi3 multi-componential metals shows a good balance of dielectric and magnetic constants. Thus, the improved impedance matching with free space brings about a superior electromagnetic wave absorption performance, especially on the effective absorption bandwidth. The minimum reflection loss (RL) of the hybrids is as low as −40.3 dB at 11 GHz with the RL bandwidth of −10 dB being 4.55 GHz (from 9.25 to 13.8 GHz).

scholarly journals Effect of Reaction Time on Microwave Absorption Properties of Fe3O4 Hollow Spheres Synthesized via Ostwald Ripening

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2921 ◽  
Author(s):  
Wei Huang ◽  
Yujiang Wang ◽  
Shicheng Wei ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Microwave Absorption ◽  
Ostwald Ripening ◽  
Impedance Matching ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Magnetic Structures ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.

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