scholarly journals Радиопоглощающие свойства феррит-полимерных композитов поливиниловый спирт/Ni-Zn феррит

2022 ◽  
Vol 92 (1) ◽  
pp. 131
Author(s):  
В.Г. Костишин ◽  
И.М. Исаев ◽  
Р.И. Шакирзянов ◽  
Д.В. Салогуб ◽  
А.Р. Каюмова ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Polyvinyl Alcohol ◽  
Polymer Composites ◽  
Reflection Loss ◽  
Spinel Ferrite ◽  
Ferrite Powder ◽  
Critical Factors ◽  
Frequency Range ◽  
Electromagnetic Wave Absorption ◽  
5 Ghz

The electromagnetic and radio-absorbing characteristics of ferrite-polymer composites with conductive inclusions based on polyvinyl alcohol are investigated. The Ni-Zn spinel ferrite powder of 2000NN grade with composition Ni0.32Zn0.68Fe2O4 was used as filler. It is shown that the obtained composites are effective absorbers in the frequency range of 2⸺5 GHz with peak reflection loss less than –20 dB. Through the analysis of the permittivity spectra and permeability spectra, as well as the calculated reflection loss spectra, critical factors of the electromagnetic wave absorption in obtained composites are established.

Electromagnetic Wave Absorption Performances of Metal Alloy/Spinel Ferrite/Polymer Composites

2012 ◽  
Vol 48 (4) ◽  
pp. 1524-1527 ◽  
Author(s):  
R. Dosoudil ◽  
J. Franek ◽  
J. Slama ◽  
M. Usakova ◽  
A. Gruskova
Keyword(s):  
Electromagnetic Wave ◽  
Polymer Composites ◽  
Spinel Ferrite ◽  
Metal Alloy ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption

Electromagnetic Wave Absorption Behavior of NiZn-Ferrite Prepared via Hydrothermal Method

2005 ◽  
Vol 480-481 ◽  
pp. 595-602 ◽  
Author(s):  
Cheng-Hsiung Peng ◽  
Hong-Wen Wang ◽  
Shih-Wei Kan ◽  
San-Yuan Chen
Keyword(s):  
Electromagnetic Wave ◽  
Hydrothermal Method ◽  
Imaginary Part ◽  
Reflection Loss ◽  
Effective Medium Theory ◽  
Frequency Range ◽  
Medium Theory ◽  
Electromagnetic Wave Absorption ◽  
The Real ◽  
Effect Of Particle Size

Ni0.5Zn0.5Fe2O4 ferrite powders were synthesized by a hydrothermal method. The nanoparticles of these materials were mixed with a thermal-plastic polyurethane (TPU)polymer in order to form a suitable composite for electromagnetic wave absorber in a frequency range from 2.0 to 15.0 GHz. The effect of particle size on the reflection loss was investigated by comparing nanosized and microsized powders. The reflection loss as a function of frequency ( f ), thickness of the absorber(d), the real and imaginary part of permittivity (ε’ /ε”) and the real and imaginary part of permeability (μ’/μ”) were obtained by calculation using the Bruggeman effective medium theory. The effect of Co2+, Cu2+, and Mg2+ on the reflection loss was also studied.

scholarly journals The Electromagnetic Wave Absorption Performance and Mechanical Properties of Cement-Based Composite Material Mixed with Functional Aggregates with High Fe2O3 and SiC

2021 ◽  
Vol 31 (4) ◽  
pp. 249-255
Author(s):  
Zuoqun Zhang ◽  
Chaoshan Yang ◽  
Hua Cheng ◽  
Xiaohan Huang ◽  
Yuhao Zhu
Keyword(s):  
Composite Material ◽  
Electromagnetic Wave ◽  
Electromagnetic Waves ◽  
Building Materials ◽  
Magnetic Loss ◽  
Frequency Range ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Test Board ◽  
Absorption Performance

Now there’re many researches on the electromagnetic radiation protection function of the cement-based electromagnetic wave absorbing materials, such materials have been widely used in various types of buildings. This paper proposed an idea for preparing a cement-based composite material by mixing functional aggregates with high content of Fe2O3 and SiC, that is, adding Fe3O4 powder and nano-SiC of different contents in the clay, and then sintering at 1190℃; the prepared aggregates showed obvious magnetic loss and dielectric loss to electromagnetic waves, and the numerical tube pressure could reach 16.83MPa. The double-layer reflectivity test board made of functional aggregates showed excellent electromagnetic wave absorption performance, its reflection loss was less than -10dB in the frequency range of 8~18GHz (corresponding to energy absorption greater than 90% EM), and its maximum RL reached -12.13dB. In addition, the compressive strength of the cement-based composite material at the age of 28 days reached 50.1 MPa, which can meet the strength requirements of building materials.

scholarly journals One-step hydrothermal synthesis of Ni–Fe–P/graphene nanosheet composites with excellent electromagnetic wave absorption properties

RSC Advances ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 5570-5581 ◽  
Author(s):  
Shuo Zhao ◽  
Chunyu Wang ◽  
Ting Su ◽  
Bo Zhong
Keyword(s):  
Electromagnetic Wave ◽  
Excellent Performance ◽  
Absorption Properties ◽  
Graphene Nanosheet ◽  
Absorption Bandwidth ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
One Step ◽  
5 Ghz ◽  
Minimum Reflection Loss

Ni–Fe–P nanoparticle/graphene nanosheet composites synthesized by a one-step hydrothermal method have excellent performance in the field of electromagnetic wave absorption, with a minimum reflection loss of −50.5 dB and a maximum effective absorption bandwidth of 5 GHz.

Double-Layered Cement Composites with Superior Electromagnetic Wave Absorbing Properties Containing Carbon Black and Expanded Polystyrene

2013 ◽  
Vol 774-776 ◽  
pp. 747-752 ◽  
Author(s):  
Yue Fang Zhang ◽  
Wan Jun Hao ◽  
Bao Yi Li ◽  
Yu Ping Duan ◽  
Shun Hua Liu
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Black ◽  
High Performance ◽  
Expanded Polystyrene ◽  
Cement Composites ◽  
Frequency Range ◽  
Electromagnetic Wave Absorption ◽  
Matching Layer ◽  
Layer Composite ◽  
New Material

This paper reported that, using the method of double layer composite successfully prepared high performance of electromagnetic wave absorption materials. Such a composite is composed of a cement matching layer filled with expanded polystyrene (EPS) beads and an absorbing cement layer made of EPS beads and carbon black. The samples were tested by arching method in the frequency range of 8~18GHz. The reflectivities were revealed to be excellent, the lowest being-17dB. The new material can be used for building indoor electromagnetic radiation protection.

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.

scholarly journals The electromagnetic absorbers based nano - structured granular polymer-composites at gigahertz frequencies.

2021 ◽  
Vol 2086 (1) ◽  
pp. 012064
Author(s):  
D Savelev ◽  
E Grushevski ◽  
N Savinski ◽  
M Soloviev ◽  
V Turov ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Polymer Composites ◽  
Electromagnetic Interference ◽  
Electromagnetic Wave Absorption ◽  
Broad Bandwidth ◽  
Wave Absorption ◽  
Absorbing Materials ◽  
Absorption Performance ◽  
Electromagnetic Absorbers

Abstract The rapid increase in electromagnetic interference has received a serious attention from researchers who responded by producing a variety of radar absorbing materials especially at high gigahertz frequencies. Ongoing investigation is being carried out in order to find the best absorbing materials which can fulfill the requirements for smart absorbing materials which are lightweight, broad bandwidth absorption, stronger absorption etc. Therefore, this article introduces the electromagnetic wave absorption mechanisms and then reveals and reviews those parameters that enhance the absorption performance.

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