High-Throughput Thermal Plasma Synthesis of FexCo1-x Nano-Chained Particles with Unusually-High Permeability, and their Electromagnetic Wave Absorption Properties at High Frequency (1-26 GHz)

Nanoscale ◽  
2021 ◽  
Author(s):  
Min-Sun Jang ◽  
Mi Se Chang ◽  
Young-tae Kwon ◽  
Sangsun Yang ◽  
Jina Gwak ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
High Throughput ◽  
Reflection Loss ◽  
Thermal Plasma ◽  
High Frequency ◽  
Plasma Synthesis ◽  
High Permeability ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Thermal Plasma Synthesis

Herein, we introduce novel 1-dimensional nano-chained FeCo particles with unusually-high permeability prepared by a highly-productive thermal plasma synthesis, and demonstrate an electromagnetic wave absorber with exceptionally low reflection loss in...

Electromagnetic Wave Absorption Cement Based on Composited Absorbing Agent

2014 ◽  
Vol 1035 ◽  
pp. 520-523 ◽  
Author(s):  
Ye Sun ◽  
Yue Fang Zhang ◽  
Wan Jun Hao
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Black ◽  
Electromagnetic Radiation ◽  
Glass Fiber ◽  
Radiation Protection ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Electromagnetic Radiations

To solve more and more serious electromagnetic radiations, electromagnetic wave absorption cement were prepared by introducing carbon black and glass fiber as composited absorbing reagent, wich can be useful in building anechoic chamber and other electromagnetic radiation protection to buildings. The results showed that the absorption properties were improved compared with single absorbing agent such as carbon or glass fiber. the lowest reflection loss of-11.3dB was obtained at 18 GHz of 5wt.% carbon black and 9wt.% glass fiber filled cement with thickness of 20mm. The increase of thickness separately can not improve the absorption properties.

scholarly journals Spawns Structure of Rod-Like ZnO Wrapped in Cellulose Nanofibers for Electromagnetic Wave Absorption

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Bitao Fan ◽  
Qiufang Yao ◽  
Chao Wang ◽  
Ye Xiong ◽  
Qingfeng Sun ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Reflection Loss ◽  
Cellulose Nanofibers ◽  
Absorption Properties ◽  
Composite Aerogel ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
One Step ◽  
Absorption Performance ◽  
Minimum Reflection Loss

Spawns structure of rod-like ZnO wrapped in the cellulose nanofibers was successfully fabricated through a facile one-step hydrothermal method, and their electromagnetic wave absorption properties were investigated. The structure and properties of the composite aerogel were characterized. The enlarged morphology images showed that the as-prepared cellulose nanofiber/ZnO samples were spawns structure of rod-like ZnO wrapped in the cellulose nanofibers. The composite aerogel in a wax matrix exhibited excellent electromagnetic wave absorption performance over 2–18 GHz. The widest absorption bandwidth of 30 wt% contained with reflection loss values less than −10 dB was up to 12 GHz (6–18 GHz) at the thickness of 5.5 mm and the minimum reflection loss value reached −26.32 dB at 15.2 GHz when the thickness of the absorber was 3 mm.

Investigation of the electromagnetic absorption properties of Ni@TiO2 and Ni@SiO2 composite microspheres with core–shell structure

2015 ◽  
Vol 17 (4) ◽  
pp. 2531-2539 ◽  
Author(s):  
Biao Zhao ◽  
Gang Shao ◽  
Bingbing Fan ◽  
Wanyu Zhao ◽  
Rui Zhang
Keyword(s):  
Electromagnetic Wave ◽  
Reflection Loss ◽  
Core Shell ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
The Core ◽  
Composite Microspheres ◽  
Electromagnetic Absorption ◽  
Core Shell Structure ◽  
Minimum Reflection Loss

The core–shell Ni–SiO2 composite exhibits the best electromagnetic wave absorption in the GHz range with a minimum reflection loss of −40.0 dB, which is superior to those of Ni–TiO2 and Ni microspheres.

Broadband Micro-Wave Absorption Properties of Ni-P Coated Fe Nanoparticles by Electroless Plating Process

2012 ◽  
Vol 549 ◽  
pp. 665-669 ◽  
Author(s):  
Gui Mei Shi ◽  
Wei Min Sun ◽  
Da Wei Lu ◽  
Shu Lian
Keyword(s):  
Electromagnetic Wave ◽  
Layer Thickness ◽  
Reflection Loss ◽  
Electroless Plating ◽  
Coating Layer ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Absorption Layer ◽  
Fe Nanoparticles

Fe nanoparticles with shell of Ni-P coating layer were successfully synthesized using Ni electroless plating process. Electromagnetic-wave absorption of Ni-P coated Fe nanoparticles has been investigated. In contrast to earlier reported materials, the absorption amplitude of as-prepared samples is found not largely decrease with increasing absorption-layer thickness. A reflection loss (RL) exceeding -20 dB can be obtained for almost the whole frequencies within the 2-18GHz range by choosing an appropriate layer thickness between 0.9 and 6.0mm. The broadest bandwidth (RLu-bands(12-18GHz), is obtained for 1.1mm layer. At the same time, it is worth noticing that in a thin thickness range 0.91-2.0mm, the reflection loss (RL) exceeding -10 dB in the 6-18GHz range is obtained, which covers half of C-bands (4-8GHz), the whole X-bands (8-12GHz) and Ku–bands (12-18GHz).

scholarly journals Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 135
Author(s):  
Zhengwei Qu ◽  
Yi Wang ◽  
Pingan Yang ◽  
Wei Zheng ◽  
Nan Li ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Iron Powder ◽  
Oxidation Resistance ◽  
Reflection Loss ◽  
Carbonyl Iron ◽  
Absorption Properties ◽  
Absorption Bandwidth ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Minimum Reflection Loss

In this work, spherical flower-shaped composite carbonyl iron powder@MnO2 (CIP@MnO2) with CIP as the core and ultrathin MnO2 nanosheets as the shell was successfully prepared by a simple redox reaction to improve oxidation resistance and electromagnetic wave absorption properties. The microwave-absorbing properties of CIP@MnO2 composites with different filling ratios (mass fractions of 20%, 40%, and 60% after mixing with paraffin) were tested and analyzed. The experimental results show that compared with pure CIP, the CIP@MnO2 composites have smaller minimum reflection loss and a wider effective absorption bandwidth than CIP (RL < −20 dB). The sample filled with 40 wt% has the best comprehensive performance, the minimum reflection loss is −63.87 dB at 6.32 GHz, and the effective absorption bandwidth (RL < −20 dB) reaches 7.28 GHz in the range of 5.92 GHz–9.28 GHz and 11.2 GHz–15.12 GHz, which covers most C and X bands. Such excellent microwave absorption performance of the spherical flower-like CIP@MnO2 composites is attributed to the combined effect of multiple beneficial components and the electromagnetic attenuation ability generated by the special spherical flower-like structure. Furthermore, this spherical flower-like core–shell shape aids in the creation of discontinuous networks, which improve microwave incidence dispersion, polarize more interfacial charges, and allow electromagnetic wave absorption. In theory, this research could lead to a simple and efficient process for producing spherical flower-shaped CIP@MnO2 composites with high absorption, a wide band, and oxidation resistance for a wide range of applications.

Electromagnetic Wave Absorption Properties of Cement Filled with Carbon Black

2014 ◽  
Vol 496-500 ◽  
pp. 2431-2434 ◽  
Author(s):  
Yue Fang Zhang ◽  
Wan Jun Hao ◽  
Yu Ping Duan ◽  
Shun Hua Liu
Keyword(s):  
Electromagnetic Wave ◽  
Dielectric Loss ◽  
Carbon Black ◽  
High Frequency ◽  
Filling Ratio ◽  
Frequency Range ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Testing Method ◽  
New Material

Using the dielectric loss property of carbon black , cement-based composites were prepared by introducing carbon black into cement. The reflection losses were studied using arched testing method in the frequency range of 2~18 GHz. The results showed that the absorption properties were improved in high frequency. The filling ratio of carbon black as well as the thickness of samples had influence on the absorption properties. The lowest reflection loss of-10.6 dB was obtained at 18 GHz of 5wt.% carbon black filled cement with thickness of 20mm. The new material can be used for building indoor electromagnetic radiation protection.

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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