Aligned polyaniline/porous biomass carbon composites with superior microwave absorption properties

2018 ◽  
Vol 30 (2) ◽  
pp. 1374-1382 ◽  
Author(s):  
Qixin Yang ◽  
Wentong Yang ◽  
Yiyuan Shi ◽  
Lujun Yu ◽  
Xiang Li ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Carbon Composites ◽  
Biomass Carbon ◽  
Absorption Properties ◽  
Microwave Absorption Properties

scholarly journals Biomass carbon derived from pine nut shells decorated with NiO nanoflakes for enhanced microwave absorption properties

RSC Advances ◽  
2019 ◽  
Vol 9 (16) ◽  
pp. 9126-9135 ◽  
Author(s):  
Huiya Wang ◽  
Yanlin Zhang ◽  
Qiuyue Wang ◽  
Chaowei Jia ◽  
Pan Cai ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Carbon Composites ◽  
Biomass Carbon ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Pine Nut

A facile strategy was applied to synthesize NiO/biomass carbon composites with excellent microwave absorption properties.

Preparation and microwave absorption properties of magnetic functional porous biomass carbon composites

Carbon ◽  
2020 ◽  
Vol 158 ◽  
pp. 931
Author(s):  
Qi-xin Yang ◽  
Lu-jun Yu ◽  
Yu-bing Dong ◽  
Ya-qin Fu ◽  
Yao-feng Zhu
Keyword(s):  
Microwave Absorption ◽  
Carbon Composites ◽  
Biomass Carbon ◽  
Absorption Properties ◽  
Microwave Absorption Properties

Preparation and microwave absorption properties of carbon nanotubes/iron oxide/polypyrrole/carbon composites

2020 ◽  
Vol 260 ◽  
pp. 116282 ◽  
Author(s):  
Kaichuang Zhang ◽  
Xuefang Chen ◽  
Xinbao Gao ◽  
Liang Chen ◽  
Shizhou Ma ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Iron Oxide ◽  
Microwave Absorption ◽  
Carbon Composites ◽  
Absorption Properties ◽  
Microwave Absorption Properties

EFFECT OF CARBONIZATION TEMPERATURE ON DIELECTRIC AND MICROWAVE ABSORBING PROPERTIES OF COBALT DOPED MESOPOROUS CARBON COMPOSITES

NANO ◽  
2014 ◽  
Vol 09 (03) ◽  
pp. 1450033 ◽  
Author(s):  
QIAN LIAN ◽  
LIUDING WANG ◽  
HONGJING WU ◽  
HAO WU
Keyword(s):  
Electron Microscope ◽  
Microwave Absorption ◽  
Mesoporous Carbon ◽  
Carbonization Temperature ◽  
Electromagnetic Properties ◽  
Carbon Composites ◽  
Chemical Compositions ◽  
Ohmic Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties

Co doped mesoporous carbon composites (MC– Co ) have been synthesized at different carbonization temperatures via evaporation-induced multicomponent co-assembly strategy. The nanostructures and chemical compositions of MC– Co composites were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM) and X-ray diffraction analysis (XRD), etc. Their electromagnetic and microwave absorption properties were investigated in the frequency ranging from 2 GHz to 18 GHz. By the measurement of electromagnetic parameters and theoretical simulation of reflection loss (RL), the results showed that the minimum RL value of the optimum composite MC– Co -800 reached up to -41.9 dB at 13.5 GHz with a thickness of only 1.80 mm, and the effective absorption bandwidth (< -10 dB) is 4.4 GHz (from 11.4 GHz to 15.8 GHz). This work demonstrated that the optimum carbonization temperature of the obtained composites is 800°C, which is critical to its electromagnetic properties. The excellent microwave absorption properties can be attributed to dielectric loss, Ohmic loss, and characteristic impedance matching. Therefore, the as-synthesized composites could be acted as a candidate of microwave absorber, especially for the light weight demand.

scholarly journals Effect of Reaction Time on Microwave Absorption Properties of Fe3O4 Hollow Spheres Synthesized via Ostwald Ripening

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2921 ◽  
Author(s):  
Wei Huang ◽  
Yujiang Wang ◽  
Shicheng Wei ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Microwave Absorption ◽  
Ostwald Ripening ◽  
Impedance Matching ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Magnetic Structures ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.

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