Enhanced absorbing properties of three-phase composites based on a thermoplastic-ceramic matrix (BaTiO3 + PVDF) and carbon black nanoparticles

2014 ◽  
Vol 2 (44) ◽  
pp. 18725-18730 ◽  
Author(s):  
Xiao-Min Meng ◽  
Xiao-Juan Zhang ◽  
Chang Lu ◽  
Ya-Fei Pan ◽  
Guang-Sheng Wang
Keyword(s):  
Carbon Black ◽  
Reflection Loss ◽  
Ceramic Matrix ◽  
Absorption Properties ◽  
Enhancement Mechanism ◽  
Enhanced Absorption ◽  
Three Phase ◽  
Carbon Black Nanoparticles ◽  
Maximum Reflection Loss

Three phase (CB + BT)/PVDF composites with enhanced absorption properties have been synthesized. The results indicate that the maximum reflection loss can reach −38.8 dB at 9.2 GHz; the enhancement mechanism was explained.

Magnetization and Microwave Absorption Properties of La0.67 Sr0.33 MnO3 with Different Particle Size

2011 ◽  
Vol 374-377 ◽  
pp. 1541-1544 ◽  
Author(s):  
Yu Lan Cheng ◽  
Ping Xia ◽  
Ke Xiang Wei ◽  
Quan Bai
Keyword(s):  
Particle Size ◽  
Sinter Temperature ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Measured Frequency Range ◽  
Maximum Reflection Loss

La 0.67 Sr 0.33 MnO 3 particles with different particle size have been prepared by sol-gel method. The structure, magnetization and microwave absorption properties have been investigated. The results show that the particle size can be controlled by sinter temperature. The peaks of the maximum reflection loss (RL) move to higher frequency regions with increasing particle size. The value of the maximum RL is -32 dB at 10.2GHz with a particle size of 58.5nm. The bandwidth with a RL exceeding -8dB reached 1.6GHz in the whole measured frequency range, suggesting that La 0.67 Sr 0.33 MnO 3 particles are promising for application as a wideband and strong absorption building microwave absorber.

Temperature dependence of the electromagnetic and microwave absorption properties of polyimide/Ti3SiC2 composites in the X band

RSC Advances ◽  
2015 ◽  
Vol 5 (105) ◽  
pp. 86656-86664 ◽  
Author(s):  
Hongyu Wang ◽  
Dongmei Zhu ◽  
Wancheng Zhou ◽  
Fa Luo
Keyword(s):  
Temperature Dependence ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Absorption Bandwidth ◽  
X Band ◽  
Maximum Reflection Loss

The maximum reflection loss value of polyimide/Ti3SiC2 composites is up to −48.6 dB at 8.5 GHz with a thickness of 2.9 mm and the absorption bandwidth below −10 dB is 3.8 GHz.

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 Excellent microwave absorption properties based on a composite of one dimensional Mo2C@C nanorods and a PVDF matrix

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21243-21248 ◽  
Author(s):  
Chao-Qin Li ◽  
Xun Shen ◽  
Ruo-Cheng Ding ◽  
Guang-Sheng Wang
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
One Dimensional ◽  
Absorption Performance ◽  
Pvdf Matrix ◽  
Maximum Reflection Loss

A Mo2C@C/PVDF composite with excellent absorption performance has been synthesized. The results indicate that the maximum reflection loss can reach −39.0 dB, and the absorbing bandwidth is up to 3.1 GHz at a thickness of 2.0 mm.

scholarly journals Microwave Absorption Properties of Double-Layer RADAR Absorbing Materials Based on Doped Barium Hexaferrite/TiO2/Conducting Carbon Black

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Sukanta Das ◽  
G. C. Nayak ◽  
S. K. Sahu ◽  
P. C. Routray ◽  
A. K. Roy ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Carbon Black ◽  
Microwave Absorption ◽  
Double Layer ◽  
Reflection Loss ◽  
Barium Hexaferrite ◽  
Conducting Layer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Absorbing Materials

In this report, we demonstrate microwave absorption properties of barium hexaferrite, doped barium hexaferrite, titanium dioxide and conducting carbon black based RADAR absorbing material for stealth application. Double-layer absorbers are prepared with a top layer consisting of 30% hexaferrite and 10% titanium dioxide while the bottom layer composed of 30% hexaferrite and 10% conducting carbon black, embedded in chloroprene matrix. The top and bottom layers are prepared as impedance matching layer and conducting layer, respectively, with a total thickness of 2 mm. Microwave absorption properties of all the composites were analyzed in X-band region. Maximum reflection loss of −32 dB at 10.64 GHz was observed for barium hexaferrite based double-layer absorber whereas for doped barium hexaferrite based absorber the reflection loss was found to be −29.56 dB at 11.7 GHz. A consistence reflection loss value (>−24 dB) was observed for doped barium hexaferrite based RADAR absorbing materials within the entire bandwidth.

One-dimensional barium titanate coated multi-walled carbon nanotube heterostructures: synthesis and electromagnetic absorption properties

RSC Advances ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 3748-3756 ◽  
Author(s):  
Yao-Feng Zhu ◽  
Qing-Qing Ni ◽  
Ya-Qin Fu
Keyword(s):  
Carbon Nanotube ◽  
Barium Titanate ◽  
Reflection Loss ◽  
Frequency Bandwidth ◽  
Absorption Properties ◽  
Microwave Absorbers ◽  
One Dimensional ◽  
Electromagnetic Absorption ◽  
Multi Walled Carbon Nanotube ◽  
Maximum Reflection Loss

BaTiO3@MWCNT heterostructures have been explored as microwave absorbers, which showed the maximum reflection loss with value of −25.7 dB at 12.1 GHz for 40 wt% loadings in wax, and the frequency bandwidth less than −20 dB is from 11.3 to 13.8 GHz.

Preparation and microwave absorption properties of multi-walled carbon nanotubes decorated with Ni-doped SnO2 nanocrystals

RSC Advances ◽  
2015 ◽  
Vol 5 (115) ◽  
pp. 94539-94550 ◽  
Author(s):  
Ling Lin ◽  
Honglong Xing ◽  
Ruiwen Shu ◽  
Lei Wang ◽  
Xiaoli Ji ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Absorption Bandwidth ◽  
Sno2 Nanocrystals ◽  
Multi Walled Carbon Nanotubes ◽  
One Step ◽  
Walled Carbon Nanotubes ◽  
Maximum Reflection Loss

Ni-doped SnO2@MWCNTs composites were synthesized by a facile one-step hydrothermal method, and had a maximum reflection loss of −39.2 dB at 8.2 GHz and the absorption bandwidth of reflection loss lower than −10 dB was 3.6 GHz.

Synthesis, Magnetic and Electromagnetic Absorption Properties of Amorphous Core-Shell Fe-B@SiO2 Submicrospheres

2017 ◽  
Vol 727 ◽  
pp. 204-210
Author(s):  
Xuan Zhong ◽  
Jing Wei Cheng ◽  
Ying Liu ◽  
Xiu Chen Zhao
Keyword(s):  
Reflection Loss ◽  
Room Temperature ◽  
Core Shell ◽  
Ferromagnetic Behavior ◽  
Absorption Properties ◽  
Step Process ◽  
Absorption Bandwidth ◽  
Electromagnetic Absorption ◽  
Attractive Candidate ◽  
Maximum Reflection Loss

Amorphous core-shell Fe-B@SiO2 submicrospheres with the SiO2 shell layer of about 18 nm were fabricated via a two-step process. Fe-B submicrospheres were first obtained, and core-shell Fe-B@SiO2 submicrospheres were subsequently fabricated using TEOs as a Si source through a modified Stöber method. The measurements of the magnetic properties demonstrated that the amorphous core-shell Fe-B@SiO2 submicrospheres exhibit ferromagnetic behavior at room temperature. The maximum reflection loss reaches −24.8 dB at 11.76 GHz for the absorber with thickness of 2.2 mm. The absorption bandwidth with the reflection loss below −10 dB is up to 14.76 GHz for the absorber with a thickness of 1.5-6 mm and the absorption bandwidth with the reflection loss below −20 dB is up to 6.6 GHz for the absorber with a thickness of 1.8-3.1 mm. Our results demonstrates that the amorphous core-shell Fe-B@SiO2 submicrospheres obtained in this work are attractive candidate materials for the magnetic and EM wave absorption applications.

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