3D porous biomass-derived carbon materials：biomass sources，controllable transformation and microwave absorption application

2021 ◽  
Author(s):  
Tian Li ◽  
Dandan Zhi ◽  
Zihao Guo ◽  
Jinzhe Li ◽  
Yao Chen ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Microwave Absorbers ◽  
Microwave Absorbing ◽  
Stealth Materials ◽  
Electromagnetic Pollution

Nowadays, to prevent acute electromagnetic pollution and develop efficient stealth materials, enormous efforts have been taken to pursuit high-performance microwave absorbing (MA) materials. Comparing to classical microwave absorbers, biomass-derived porous...

scholarly journals Extending effective microwave absorbing bandwidth of CoNi bimetallic alloy derived from binary hydroxides

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Weihua Gu ◽  
Jiabin Chen ◽  
Yue Zhao ◽  
Gehuan Wang ◽  
Fan Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Magnetic Loss ◽  
Impedance Matching ◽  
Cost Effective ◽  
Synthesis Process ◽  
Microwave Absorbers ◽  
The Sustainable Development ◽  
Bimetallic Alloy ◽  
Working Frequency ◽  
Microwave Absorbing

Abstract Effectively broadening microwave absorbing frequency of pure magnetic substances remains a huge challenge. Herein, micro-perspective structures can be controlled through a calcination route. Satisfactorily, the composites prepared at the calcination temperature of 900 °C exhibit excellent microwave attenuation performance with a broad working frequency and appropriate paraffin filling ratio. Remarkably, the composites can reach an extremely high reflection loss (RL) value of − 49.79 dB, and the extended effective working frequency range (RL < − 10 dB) of 6.84 GHz can also be obtained. Superb magnetic loss, admirable dielectric loss, sufficient dipole polarization, as well as superior impedance matching should be band together for obtaining ideal microwave absorbers. The CoNi hydroxides derived bimatallic alloy composites were fabricated via a cost-effective and facile synthesis process, and this work aroused inspirations of designing high-performance microwave absorbers for mataining the sustainable development.

scholarly journals Fabrication of PPy Nanosphere/rGO Composites via a Facile Self-Assembly Strategy for Durable Microwave Absorption

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 998 ◽  
Author(s):  
Ying Wang ◽  
Yunchen Du ◽  
Bo Wu ◽  
Binhua Han ◽  
Shaoming Dong ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Self Assembly ◽  
High Performance ◽  
Chemical Reduction ◽  
Characteristic Impedance ◽  
Microwave Absorbers ◽  
Reduced Graphene ◽  
Magnetic Metal ◽  
Long Time ◽  
Absorption Performance

Traditional magnetic metal and alloy materials suffer from easy oxidation and high density, which hinders their practical application as high-performance microwave absorbers. Lightweight and durability have become new goals in the fabrication of the next generation of microwave absorbers. Herein, we report the synthesis of polypyrrole (PPy) nanosphere/reduced graphene oxide (rGO) composites through chemical reduction of self-assembly PPy nanosphere/GO hybrids. PPy nanospheres and GO are integrated effectively by π–π interaction of dual conjugated systems. When the mass ratio of PPy nanospheres to rGO is 0.6:1, the resultant composite, PPy/rGO-0.6, presents comparable/superior reflection loss characteristics to those magnetic metals and their related graphene-based composites in previous studies. Electromagnetic analysis reveals that well-matched characteristic impedance, multiple polarization loss, and good conductivity loss are, together, responsible for the excellent microwave absorption performance of PPy/rGO-0.6. More importantly, PPy/rGO-0.6 also exhibits good microwave absorption after being treated at 423 K for a long time. This work provides a new idea for designing and preparing a high-performance microwave absorber with lightweight and durable features.

scholarly journals Dynamic arrays based on magnetically controlled Fe3O4 particles

2018 ◽  
Vol 178 ◽  
pp. 04006
Author(s):  
Ivan Shorstkii
Keyword(s):  
Magnetic Field ◽  
Microwave Absorption ◽  
High Performance ◽  
Functional Materials ◽  
Dipole Interaction ◽  
Electromagnetic Shielding ◽  
Rotating Magnetic Field ◽  
Performance Functional ◽  
Microwave Absorbing

In this work, a new concept of dynamic granular arrays was proposed based on magnetically controlled particles. Method of external rotating magnetic field (ERMF), based on a dipole interaction of magnetic spherical Fe3O4 particles in highly ordered volume arrays is proposed. The microwave-absorbing characteristics results of developed composites offer an effective way to design high-performance functional materials to facilitate the research in electromagnetic shielding and microwave absorption.

Polyimide-based graphene composite foams with hierarchical impedance gradient for efficient electromagnetic absorption

2021 ◽  
Author(s):  
Lei Pu ◽  
Shuangshuang Li ◽  
Yawei Zhang ◽  
Haiyan Zhu ◽  
Wei Fan ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Absorption Capacity ◽  
Strong Absorption ◽  
Composite Foam ◽  
Broad Bandwidth ◽  
Graphene Composite ◽  
Electromagnetic Absorption ◽  
Composite Foams ◽  
Electromagnetic Pollution

The development of high-performance microwave absorption materials with strong absorption capacity and broad bandwidth is highly desirable in the field of electromagnetic pollution protection. Herein, polyimide/graphene composite foam with multi-hierarchical...

scholarly journals Synthesis of nitrogen-doped graphene wrapped SnO2 hollow spheres as high-performance microwave absorbers

RSC Advances ◽  
2019 ◽  
Vol 9 (19) ◽  
pp. 10745-10753 ◽  
Author(s):  
Weiyong Dai ◽  
Hui Luo ◽  
Fu Chen ◽  
Xian Wang ◽  
Ying Xiong ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Hollow Sphere ◽  
High Performance ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbers ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Nitrogen-doped graphene/SnO2 hollow sphere hybrids were synthesized and show high-performance microwave absorption properties.

Co/C nanoparticles with low graphitization degree: a high performance microwave-absorbing material

2016 ◽  
Vol 4 (8) ◽  
pp. 1727-1735 ◽  
Author(s):  
Tong Liu ◽  
Xiubo Xie ◽  
Yu Pang ◽  
Satoru Kobayashi
Keyword(s):  
Carbon Source ◽  
Microwave Absorption ◽  
High Performance ◽  
Arc Plasma ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Plasma Method ◽  
Graphitization Degree ◽  
Absorbing Material ◽  
Microwave Absorbing

Co/C nanoparticles with low graphitization degree that have been prepared by an arc plasma method using methane as the carbon source exhibit high microwave absorption properties.

Cobalt nanoparticles encapsulated in a nitrogen and oxygen dual-doped carbon matrix as high-performance microwave absorbers

2019 ◽  
Vol 6 (9) ◽  
pp. 2472-2480 ◽  
Author(s):  
Sifan Zeng ◽  
Mengyu Wang ◽  
Wanlin Feng ◽  
Lini Zhu ◽  
Zhen Teng ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
High Performance ◽  
Magnetic Loss ◽  
Carbon Matrix ◽  
Cobalt Nanoparticles ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbers ◽  
Loss Mechanisms

Co@NOC composites showed impressive microwave absorption properties owing to multiple dielectric and magnetic loss mechanisms.

Constructing and optimizing hollow bird-nest-patterned C@Fe3O4 composites as high-performance microwave absorbers

2021 ◽  
Vol 532 ◽  
pp. 167990
Author(s):  
Guanzhen Chen ◽  
Dongwei Xu ◽  
Ping Chen ◽  
Xiang Guo ◽  
Qi Yu ◽  
...  
Keyword(s):  
High Performance ◽  
Microwave Absorbers ◽  
Bird Nest
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