scholarly journals Nanostructured Barium Titanate/Carbon Nanotubes Incorporated Polyaniline as Synergistic Electromagnetic Wave Absorbers

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Lujun Yu ◽  
Yaofeng Zhu ◽  
Chen Qian ◽  
Qiang Fu ◽  
Yongzhen Zhao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Wave ◽  
Barium Titanate ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Network Structures ◽  
Conductive Network ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Absorption

The three-dimensional (3D) conductive network structures formed by barium titanate/carbon nanotubes incorporated polyaniline were favorable for strengthening electromagnetic absorption capability. Herein, an easy and flexible method consisting of sol-gel technique, in situ polymerization, and subsequent mechanical method have been developed to prepare the barium titanate/carbon nanotubes incorporated polyaniline (CNTs/BaTiO3/PANI or CBP) ternary composites. The dielectric properties and microwave absorption properties of CNTs/BaTiO3/PANI composites were investigated in the frequency range of 2–18 GHz by vector network analyzer. Interestingly, it is found that the CNTs/BaTiO3/PANI composites with 3D conductive network structures presented outstanding electromagnetic absorption properties, which may be attributed to the high impedance matching behavior and improved dielectric loss ability and novel synergistic effect. Additionally, it also can be supposed that the “geometrical effect” of composite was more beneficial to absorbing the incident electromagnetic wave. The CNTs/BaTiO3/PANI composite (the mass ratio of CNTs/BaTiO3to PANI is 2 : 3) exhibits the best microwave absorption properties, of which the minimum reflection loss value can reach −30.9 dB at 8 GHz and the absorption bandwidth with a reflection loss blew −10 dB ranges from 7.5 to 10.2 GHz.

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.

scholarly journals Electromagnetic wave absorption properties of ternary poly(vinylidene fluoride)/magnetite nanocomposites with carbon nanotubes and graphene

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 1919-1924 ◽  
Author(s):  
C. Tsonos ◽  
N. Soin ◽  
G. Tomara ◽  
B. Yang ◽  
G. C. Psarras ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Wave ◽  
Microwave Absorption ◽  
Vinylidene Fluoride ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Poly Vinylidene Fluoride ◽  
Twin Screw

Ternary nanocomposite systems of PVDF/Fe3O4/CNT and PVDF/Fe3O4/GN, prepared with twin screw compounding method, exhibit enhanced microwave absorption properties.

Facile synthesis of porous coin-like iron and its excellent electromagnetic absorption performance

RSC Advances ◽  
2015 ◽  
Vol 5 (33) ◽  
pp. 25936-25941 ◽  
Author(s):  
Hualiang Lv ◽  
Xiaohui Liang ◽  
Yan Cheng ◽  
Guangbin Ji ◽  
Dongming Tang ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Electromagnetic Scattering ◽  
Special Structure ◽  
Facile Synthesis ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Absorption ◽  
Absorption Performance

The porous coin-like iron exhibits excellent microwave absorption properties with the optimal reflection loss value of −53.2 dB at a thickness of 1.4 mm. This special structure is attributed to electromagnetic scattering behavior which is benefit for microwave absorption.

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.

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

Symmetrical polyhedron-bowl Co/CoO with hexagonal plate to forward electromagnetic wave absorption ability

CrystEngComm ◽  
2019 ◽  
Vol 21 (5) ◽  
pp. 816-826 ◽  
Author(s):  
Biao Zhao ◽  
Yang Li ◽  
Junwei Liu ◽  
Lei Fan ◽  
Ka Gao ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Microwave Absorption ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Hexagonal Plate

The symmetrical polyhedron-bowl structured Co/CoO displays enhanced microwave absorption properties.

Large-Scale Synthesis and Microwave Absorption Properties of CoFe2O4/ Co0.4Zn0.6Fe2O4 Hollow Nanospheres

2015 ◽  
Vol 645-646 ◽  
pp. 126-131
Author(s):  
Qing Guo Ren ◽  
Xiao Jing Qiao ◽  
Yan Li ◽  
Zhi Gang Sun ◽  
Xiao Dang Guo ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Large Scale ◽  
Average Diameter ◽  
Hollow Nanospheres ◽  
Magnetic Studies ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Line Theory ◽  
Glycol Solution

Monodisperse CoFe2O4and Co0.4Zn0.6Fe2O4hollow nanospheres were synthesized in large scale by solvothermal method in ethylene glycol solution. The structure, shape and size of the samples were investigated by Fourier Transform infrared, X-ray powder diffraction and scanning electron microscopy. The results indicate that the products are spherical with an average diameter less than 200 nm. Magnetic studies revealed that the saturation magnetization of Co0.4Zn0.6Fe2O4is 78.6 emu/g, higher than the CoFe2O4, which is 69 emu/g, while the coercivity of the Co0.4Zn0.6Fe2O4is 184 Oe , obviously lower than that of CoFe2O4which is 832 Oe. The electromagnetic parameters were measured at 2-18 GHz using HP8722ES vector network analyzer and then the microwave absorption properties were calculated through the transmission line theory. As to the Co0.4Zn0.6Fe2O4, the absorption bandwidth with reflection loss below-10 dB is up to 3GHz, from 10GHz to 13GHz with a thickness of 2 mm. A maximum reflection loss-45.6 dB was found at 12.9 GHz for the CoFe2O4with a thickness of 1.8 mm. As a result, the as-prepared hollow nanospheres show good prospects of being applied in EM wave absorption materials.

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