Preparation of the PBOPy/PPy/Fe3O4 composites with high microwave absorption performance and thermal stability

2014 ◽  
Vol 100 ◽  
pp. 212-219 ◽  
Author(s):  
Yangming Li ◽  
Dandan Chen ◽  
Xiaoyun Liu ◽  
Yunchao Zhou ◽  
Qixin Zhuang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Microwave Absorption ◽  
Absorption Performance ◽  
Microwave Absorption Performance

γ-Fe2O3–MWNT/poly(p-phenylenebenzobisoxazole) composites with excellent microwave absorption performance and thermal stability

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6440-6447 ◽  
Author(s):  
Yi Chen ◽  
Xiaoyun Liu ◽  
Xiaoyang Mao ◽  
Qixin Zhuang ◽  
Zhong Xie ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Microwave Absorption ◽  
Absorption Properties ◽  
Absorption Performance ◽  
Microwave Absorption Performance

A thermostable γ-Fe2O3–MWNTs/PBO composite with excellent absorption properties was obtained with a low content of magnetic fillers and a well defined structure.

Structure and Microwave Absorption Properties of Polyaniline/Zn Ferrite Composites

NANO ◽  
2018 ◽  
Vol 13 (09) ◽  
pp. 1850105 ◽  
Author(s):  
Honglong Xing ◽  
Ye Liu ◽  
Zhenfeng Liu ◽  
Huan Wang ◽  
Hanxiao Jia
Keyword(s):  
Thermal Stability ◽  
Microwave Absorption ◽  
Coating Thickness ◽  
Phase Particle ◽  
Step Method ◽  
Microwave Absorption Properties ◽  
Zn Ferrite ◽  
Absorption Performance ◽  
Ferrite Composites ◽  
Microwave Absorption Performance

Polyaniline (PANI)/Zn ferrite composites were fabricated by simple two-step method. The crystal phase, particle size, morphology, thermal stability and conductivity were characterized. Electromagnetic parameters of PANI/Zn ferrite composites were measured at room temperature in the frequency of 2–18[Formula: see text]GHz. The prepared composite had an amorphous fluffy structure, Zn ferrite nanoparticles with diameters ranging from 20[Formula: see text]nm to 30[Formula: see text]nm are encapsulated in PANI or on PANI surface, and the thermal stability of the composite is poor. But Zn ferrite content plays a key role in influencing this structure and regulating microwave attenuation capability. The PANI/Zn ferrite composites showed an enhanced microwave absorption performance in Ku band at thin coating thickness which corresponds to RL value below [Formula: see text][Formula: see text]dB and the minimum reflection loss (RL) is [Formula: see text][Formula: see text]dB at 17.6[Formula: see text]GHz with the coating thickness of 1.4[Formula: see text]mm.

Polybenzobisoxazoles-based nanocomposites with high microwave absorption performance and excellent thermal stability

Polymer ◽  
2016 ◽  
Vol 99 ◽  
pp. 605-613 ◽  
Author(s):  
Xiaoyun Liu ◽  
Yonglei Lv ◽  
Qixin Zhuang ◽  
Yangming Li ◽  
Shaodong Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Microwave Absorption ◽  
Excellent Thermal Stability ◽  
Absorption Performance ◽  
Microwave Absorption Performance

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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