In situ growth of B4C nanowires on activated carbon felt to improve microwave absorption performance

2020 ◽  
Vol 116 (20) ◽  
pp. 203101
Author(s):  
Beibei Wang ◽  
Qiangang Fu ◽  
Qiang Song ◽  
Zhaoju Yu ◽  
Ralf Riedel
Keyword(s):  
Activated Carbon ◽  
Microwave Absorption ◽  
In Situ Growth ◽  
Carbon Felt ◽  
Absorption Performance ◽  
Microwave Absorption Performance

In-situ synthesis of layered coal-based carbon/Co porous magnetic composites with promising microwave absorption performance

2021 ◽  
Author(s):  
Yang Fan ◽  
Ximing Zhang ◽  
Jingyu Wang ◽  
Hengdong Ren ◽  
Yin Liu ◽  
...  
Keyword(s):  
Phase Composition ◽  
Chemical Composition ◽  
Microwave Absorption ◽  
In Situ Synthesis ◽  
Magnetic Composites ◽  
Microwave Absorbing Properties ◽  
In Situ Method ◽  
Absorption Performance ◽  
Microwave Absorption Performance

In this paper, light and ultra-thin coal-based carbon cobalt composites (CBC/Co) with excellent microwave absorbing properties were synthesized by using an in-situ method from anthracite. Phase composition and chemical composition...

scholarly journals 3D Seed-Germination-Like MXene with In Situ Growing CNTs/Ni Heterojunction for Enhanced Microwave Absorption via Polarization and Magnetization

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Xiao Li ◽  
Wenbin You ◽  
Chunyang Xu ◽  
Lei Wang ◽  
Liting Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Seed Germination ◽  
Microwave Absorption ◽  
Magnetic Loss ◽  
Impedance Matching ◽  
Matching Condition ◽  
Ni Nanoparticles ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Highlights Benefiting from the possible “seed-germination” effect, the “seeds” Ni2+ grow into “buds” Ni nanoparticles and “stem” carbon nanotubes (CNTs) from the enlarged “soil” of MXene skeleton. Compared with the traditional magnetic agglomeration, the MXene-CNTs/Ni hybrids exhibit the highly spatial dispersed magnetic architecture. 3D MXene-CNTs/Ni composites hold excellent microwave absorption performance (−56.4 dB at only 2.4 mm). Abstract Ti3C2Tx MXene is widely regarded as a potential microwave absorber due to its dielectric multi-layered structure. However, missing magnetic loss capability of pure MXene leads to the unmatched electromagnetic parameters and unsatisfied impedance matching condition. Herein, with the inspiration from dielectric-magnetic synergy, this obstruction is solved by fabricating magnetic CNTs/Ni hetero-structure decorated MXene substrate via a facile in situ induced growth method. Ni2+ ions are successfully attached on the surface and interlamination of each MXene unit by intensive electrostatic adsorption. Benefiting from the possible “seed-germination” effect, the “seeds” Ni2+ grow into “buds” Ni nanoparticles and “stem” carbon nanotubes (CNTs) from the enlarged “soil” of MXene skeleton. Due to the improved impedance matching condition, the MXene-CNTs/Ni hybrid holds a superior microwave absorption performance of − 56.4 dB at only 2.4 mm thickness. Such a distinctive 3D architecture endows the hybrids: (i) a large-scale 3D magnetic coupling network in each dielectric unit that leading to the enhanced magnetic loss capability, (ii) a massive multi-heterojunction interface structure that resulting in the reinforced polarization loss capability, confirmed by the off-axis electron holography. These outstanding results provide novel ideas for developing magnetic MXene-based absorbers.

In situ regulating aspect ratio of bamboo-like CNTs via CoxNi1−x-catalyzed growth to pursue superior microwave attenuation in X-band

2019 ◽  
Vol 6 (1) ◽  
pp. 309-316 ◽  
Author(s):  
Yan Cheng ◽  
Jieming Cao ◽  
Hualiang Lv ◽  
Huanqin Zhao ◽  
Yue Zhao ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Microwave Absorption ◽  
Aspect Ratios ◽  
Microwave Attenuation ◽  
X Band ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Controlling aspect ratios of bamboo-like CNTs to achieve superior microwave absorption performance in X-band.

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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