scholarly journals Microwave Absorption Properties of Carbon Nanotubes-Epoxy Composites in a Frequency Range of 2 - 20 GHz

2013 ◽  
Vol 03 (02) ◽  
pp. 17-23 ◽  
Author(s):  
Zhou Wang ◽  
Guang-Lin Zhao
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Epoxy Composites ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties

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.

Enhanced microwave absorption properties of MnS2 microspheres interspersed with carbon nanotubes

2020 ◽  
Vol 502 ◽  
pp. 166432 ◽  
Author(s):  
Chao Liu ◽  
Bochong Wang ◽  
Congpu Mu ◽  
Kun Zhai ◽  
Fusheng Wen ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Microwave Absorption ◽  
Absorption Properties ◽  
Microwave Absorption Properties

Magnetic and Microwave Absorption Properties of Magnetite-Durian Shell Nanocomposite Sheet in Gigahertz Range

2018 ◽  
Vol 775 ◽  
pp. 217-223
Author(s):  
Afraha Baiti Arif ◽  
Rose Farahiyan Munawar ◽  
Qumrul Ahsan ◽  
Maisarah Abu
Keyword(s):  
Microwave Absorption ◽  
Electromagnetic Interference ◽  
Filler Content ◽  
Spherical Shape ◽  
Constant Thickness ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Weight Percentage ◽  
Durio Zibethinus

In this paper, a novel microwave absorber of thin, light weight, flexible, green and low cost magnetic nanocomposite sheet that can work in high frequency range is fabricated. The vast and increasing numbers in electronic and telecommunication devices has create electromagnetic interference (EMI) in which may lead to application disturbance. Therefore, electromagnetic (EM) wave absorber with the ability of high absorption rate is strongly demanded. Here, durian shell (Durio zibethinus Murray) embedded magnetite (Fe3O4) nanocomposite sheets were prepared via pulping and lumen loading technique. The nanocomposite sheets were fabricated by varying the weight percentage of the filler content (2-10 wt% of Fe3O4) at constant thickness and varying the thickness of the sheets (0.1-1.0 mm) at constant filler content. FESEM micrograph shows that the Fe3O4 nanoparticles are in cubical and spherical shape with the 20–50 nm of size range. The microwave absorption properties of the sheets were tested by a vector network analyze (VNA) in the frequency range of 4-18 GHz. The samples were also tested using vibrating sample magnetometer (VSM) in order to study the magnetic properties. The absorption or maximum reflection loss (RL) of the samples increases continually and the increase of both filler content and sample thickness has led to the shift of dip to lower frequency region.

scholarly journals Preparation and Microwave Absorption Properties of CNTs/Fe3O4 Composite for Hyperthermia Applications

2011 ◽  
Vol 20 (3) ◽  
pp. 096369351102000
Author(s):  
Liu Aihong
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Wave ◽  
Microwave Absorption ◽  
Hydrothermal Treatment ◽  
Treatment Method ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Tumor Hyperthermia

In this letter, the surface of carbon nanoutubes was successfully decorated by Fe3O4 via a simple and effective coprecipitation and hydrothermal treatment method. Then the resultant composite were characterized. The results showed that Fe3O4 nanoparticles in the surface of carbon nanotubes were uniform and universal; The composite was ferromagnetic and also had better absorbing properties in the 0-5GHz range. CNTs/Fe3O4 composite had significant potential for electromagnetic wave absorption application in tumor hyperthermia.

Single-Layer and Double-Layer Microwave Absorbers Based on Graphene Nanosheets/Epoxy Resin Composite

NANO ◽  
2017 ◽  
Vol 12 (07) ◽  
pp. 1750089 ◽  
Author(s):  
Dandan Min ◽  
Wancheng Zhou ◽  
Yuchang Qing ◽  
Fa Luo ◽  
Dongmei Zhu
Keyword(s):  
Absorption Band ◽  
Epoxy Resin ◽  
Microwave Absorption ◽  
Double Layer ◽  
Graphene Nanosheets ◽  
Resin Composite ◽  
Single Layer ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties

Graphene nanosheets/epoxy resin (GN/EP) composites with enhanced microwave absorption properties were prepared. The influence of GNs content on the electromagnetic and microwave-absorbing properties of single-layer GN/EP composites was investigated in the frequency range of 2–18[Formula: see text]GHz. A novel double-layer microwave absorber by combining absorbers with different contents of graphene was designed to achieve absorbers with wide absorption band and optimal microwave absorption. The calculated microwave absorption properties indicated that broader absorption band was obtained by the double-layer GN/EP composites. Reflection loss (RL) values below [Formula: see text]5[Formula: see text]dB can be obtained in the frequency range of 4.4–18[Formula: see text]GHz by the double-layer GN/EP composites at thickness of 3.9[Formula: see text]mm.

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