Synthesis and microwave absorption properties of hierarchical Fe micro-sphere assembly by nano-plates

Yang, Pingan; Yu, Minggao; Fu, Jie; Wang, Lirui

doi:10.1016/j.jallcom.2017.05.296

Cited by 30 publications

(17 citation statements)

References 28 publications

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“…24 The reason lies in the high specific surface area and porous structure of the samples, which aggravate the surface disorder and obstruct the production of domain walls. 43 A similar decrease for M s has been reported in various flowerlike and hollow structures, such as hierarchical Fe microspheres, 44 glass-iron composite hollow particles, 45 hollow Co nanochains, 40 and hollow porous Co spheres. 30 On the other hand, the coercivity (H c ) value is 20.8 Oe for porous Fe 3 O 4 HNs, which is much closer to the values of reported Fe 3 O 4 microspheres (∼20 Oe) 46 and smaller than that of bulk Fe 3 O 4 (115−150 Oe).…”

Section: ■ Results and Discussionsupporting

confidence: 77%

Porous Fe Hollow Structures with Optimized Impedance Matching as Highly Efficient, Ultrathin, and Lightweight Electromagnetic Wave Absorbers

Yang

et al. 2019

Ind. Eng. Chem. Res.

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Porous Fe hollow nanospheres (HNs) were fabricated successfully through hydrogen thermal reduction on solvothermal synthesized Fe 3 O 4 HNs. The electromagnetic wave (EMW) absorption performances of the porous Fe 3 O 4 and Fe HNs were investigated in 2.0−18.0 GHz. Owing to an optimized matching from the modulated permittivity and increased permeability, the porous Fe HNs exhibited remarkably enhanced EMW absorption than porous Fe 3 O 4 HNs as well as previously reported Fe-based absorbers. The minimum reflection loss (RL) for porous Fe HNs reached −47.1 dB at 15.2 GHz, and the matching thickness was as thin as 1.69 mm. The effective bandwidth (RL < −10 dB) from 13.2 to 18.0 GHz at 1.69 mm almost covered the whole K u band. Our results provided a highly efficient and ultrathin EMW absorber with easy preparation, strong absorption, broad bandwidth, and lightweight.

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Section: ■ Results and Discussionsupporting

confidence: 77%

Porous Fe Hollow Structures with Optimized Impedance Matching as Highly Efficient, Ultrathin, and Lightweight Electromagnetic Wave Absorbers

Yang

et al. 2019

Ind. Eng. Chem. Res.

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“…In comparison with literature data of absorption characteristics for Fe based composite materials, our RL values in the frequency range from 8 to 12 GHz demonstrates stronger absorption characteristics [24]. The attenuation coefficient indicates that Al shell, as a result of cladding a spherical particle of Fe according to the proposed method, has Foucault currents.…”

Section: Absorption Characteristicssupporting

confidence: 50%

“…The mechanism of Fe particles coating by aluminium nanoparticles using mechanical friction was described. Suggested hypothesis about the effect of the surface charge density in the Al nanoparticles layer on the magnetizat ion of t h e Fe core Fe(Al) sample Fe sample adopted from [24]…”

Section: Discussionmentioning

confidence: 99%

Absorbing materials based on magnetically controlled Fe-Al microparticles

Sosnin

Шорсткий

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Rotating permanent magnetic field (RPMF) method was used to obtain an absorbing material based on hexagonally packaged Fe-Al particles. A new kind of material - absorber in the microwave range was obtained. As the main characteristic, the reflection, absorption and attenuation spectra of the electromagnetic radiation of Fe-Al composites were obtained and analysed. Reflection characteristics of Fe-Al composite materials using the RPMF method were improved.

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“…In an adhesive process, the unsaturated Zn 2+ and O atoms on the surface of lamellae would coordinate with the O atoms and Zn 2+ on catalyst particles, which provided the driving force. In summary, the flower‐like morphology was formed by precipitation, nucleation, growth and self‐assembly processes . In the cases of DMC‐2 and DMC‐3, since there was always an excess of reactant, the raw material would react quickly with another one.…”

Section: Resultsmentioning

confidence: 99%

Effects of addition mode on Zn–Co double metal cyanide catalyst for synthesis of oligo(propylene‐carbonate) diols

Ning

et al. 2018

Applied Organom Chemis

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Zn-Co double metal cyanide (DMC) complexes are promising catalytic systems for copolymerization of epoxide and CO 2 . In the work reported, Zn-Co DMC catalysts were prepared by parallel-flow dropping, forward dropping and reverse dropping methods, aiming to provide an insight into the effect of addition mode on catalyst structure and catalytic performance. Catalytic properties were evaluated using the copolymerization reaction of propylene oxide (PO) and CO 2 in the presence of chain transfer agent. The results indicated that the factors that affect crystalline state are different for different modes. And excess zinc chloride is the prerequisite for organic ligands to be retained in the catalyst and affect the structure. In addition, a catalyst with flower-like morphology was obtained with the parallel-flow dropping method which provided larger surface area. An appropriate O/Zn value ensured abundant active PO which would suppress the backbiting process by forming consecutive PO units adjacent to CO 2 units. Oligo(propylene-carbonate) diols with average molecular weight of 1020 g mol −1 , CO 2 incorporation of 24.92% and W PC of 5.14 wt% were obtained at 80°C and 2 MPa.

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Synthesis and microwave absorption properties of hierarchical Fe micro-sphere assembly by nano-plates

Cited by 30 publications

References 28 publications

Porous Fe Hollow Structures with Optimized Impedance Matching as Highly Efficient, Ultrathin, and Lightweight Electromagnetic Wave Absorbers

Porous Fe Hollow Structures with Optimized Impedance Matching as Highly Efficient, Ultrathin, and Lightweight Electromagnetic Wave Absorbers

Absorbing materials based on magnetically controlled Fe-Al microparticles

Effects of addition mode on Zn–Co double metal cyanide catalyst for synthesis of oligo(propylene‐carbonate) diols

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