Rare earth lanthanum pinning effect for corrosion resistance ultraefficient microwave absorption FeCo@rGO composites

Yao, Junru; Zhou, Jintang; Lu, Lu; Yang, Feng; Yao, Zhengjun; Ouyang, Bo; Kan, Erjun; Zuo, Yuxin; Che, Renchao; Wu, Fan

doi:10.1016/j.jmst.2023.07.075

Cited by 17 publications

(2 citation statements)

References 44 publications

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“…The RL of the PS-based samples was estimated by the transmission line theory. − The relative permittivity (ε), relative permeability (μ), and impedance matching ( Z ) are the salient parameters tuning microwave-absorbing features. Conductive loss and polarizations, including dipole and interfacial polarization, bring permittivity; meanwhile, natural resonance, exchange resonance, and eddy current loss establish permeability.…”

Section: Resultsmentioning

confidence: 99%

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Selseleh-Zakerin,

Mirkhan,

Shafiee

et al. 2024

Langmuir

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During the past decade, ever-increasing electromagnetic pollution has excited a global concern. A sustainable resource, facile experimental scenario, fascinating reflection loss (RL), and broad efficient bandwidth are the substantial factors that intrigue researchers. This research led to the achievement of a brilliant microwave-absorbing material by treating pampas as biomass. The carbon-based microfibers attained by biowaste were treated by plasma under diverse environments to amplify their microwave-absorbing features. Moreover, a pyrolysis scenario was performed to compare the results. The reductive processes were performed by H 2 plasma and carbonization. However, the CO 2 plasma was performed to regulate the heteroatoms and defects. Interestingly, polystyrene (PS) was applied as a microwaveabsorbing matrix. The aromatic rings existing in the absorbing medium establish electrostatic interactions, elevating interfacial polarization, and physical characteristics of PS augment the practical applications of the final product. The manipulated biomasses were characterized by Raman, X-ray diffraction, energy-dispersive spectroscopy, field emission scanning electron microscopy, and diffuse reflection spectroscopy analyses. Eventually, the microwave-absorbing features were estimated by a vector network analyzer. The plasma-treated pampas under H 2 /Ar blended with PS gained a maximum RL of −90.65 dB at 8.79 GHz and an efficient bandwidth (RL ≤ −10 dB) of 4.24 GHz with a thickness of 3.20 mm; meanwhile, plasma treatment under CO 2 led to a maximum RL of 97.99 dB at 14.92 GHz and an efficient bandwidth of 7.74 GHz with a 2.05 mm thickness. Particularly, the biomass plasmolyzed under Ar covered the entire X and K u bands with a thickness of 2.10 mm. Notably, total shielding efficiencies of the treated bioinspired materials were up to ≈99%, desirable for practical applications.

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Section: Resultsmentioning

confidence: 99%

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Selseleh-Zakerin,

Mirkhan,

Shafiee

et al. 2024

Langmuir

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“…High-performance EMW absorbers are inseparable from the selection of excellent wave-absorbing components. Two-dimensional (2D) materials, such as graphene, , MoS 2 , layered double hydroxides (LDHs), and MXenes, have recently attracted widespread attention as electromagnetic absorbers. Considering their unique atomic-layer thicknesses, high specific surface areas, and outstanding processing properties, 2D materials have emerged as one of the finest candidates for building lightweight, high-performance EMW absorbers .…”

Section: Introductionmentioning

confidence: 99%

3D Lightweight Interconnected Melamine Foam Modified with Hollow CoFe₂O₄/MXene toward Efficient Microwave Absorption

Wu,

Rao,

et al. 2024

ACS Appl. Mater. Interfaces

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Considering the increasing severity of electromagnetic wave pollution, the development of high-performance low-filler-content microwave absorbers possessing wide frequency bands and strong absorption for practical applications is a demanding research hotspot. In this study, from the perspectives of the electromagnetic component coordination and structural design, a three-dimensional (3D) interconnected CoFe 2 O 4 /MXene-melamine foam (MF) was constructed via simple impregnation and a single freeze-drying step. By changing the absorber (CoFe 2 O 4 /MXene) concentration, the pore opening and electromagnetic properties of the 3D foams can be effectively adjusted. When the absorber concentration is sufficiently high to clog the internal pores, the microwave absorption is hindered. When the filler (CoFe 2 O 4 /MXene-MF) content is just ∼5.8 wt % (at a density of ∼33.3 mg cm −3 ), a minimum reflection loss (RL min ) of −72.1 dB is achieved at a matching thickness of 3.32 mm, and an effective absorption bandwidth (4.54 GHz) covering the whole X band is achieved at a thickness of 3 mm. CoFe 2 O 4 /MXene-MF, which possesses a 3D porous electromagnetic network structure, optimizes impedance matching and enhances multiple polarization relaxations and reflections/scattering, resulting in superior absorption capabilities. In particular, the continuous network structure ensures the uniform distribution of electromagnetic fields in the microstructure, achieving high absorption at low filler contents. This work provides a reference for subsequent 3D absorber concentration studies and a novel engineering strategy for preparing a low-filler-content, lightweight, and efficient electromagnetic wave absorber, which could be applied in the fields of radar security and information communications. KEYWORDS: Ti 3 C 2 T x MXene, hollow CoFe 2 O 4 , microwave absorption, low filler content, 3D electromagnetic networks

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Electron Migratory Polarization of Interfacial Electric Fields Facilitates Efficient Microwave Absorption

Duan,

Zhou,

Yan

et al. 2024

Adv Funct Materials

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High‐performance microwave absorption materials (MAM) are often accompanied by synergistic effects of multiple loss mechanisms, but the contribution share of various loss mechanisms has been neglected to provide a template and reference for the design of MAM. Here, a highly conductive 2D structure is designed through a functional group‐induced structure modulation strategy, composite L‐Ni@C can reach an effective absorption bandwidth of 6.45 GHz at 15% fill rate, with a maximum absorption efficiency of 99.9999%. Through the layer‐by‐layer analysis of the loss mechanism, it is found that the strong loss originates from the polarization loss at the heterogeneous interface. The movement of space charge between the two‐phase interface forms an interfacial electric field, and the in situ doping of nitrogen is cleverly achieved by the introduction of amino functional groups, which significantly enhances the rate of space charge transfer between the two‐phase interface and greatly facilitates the electron migration polarization. The space charge motion law of the interfacial electric field is also simulated using COMSOL simulation software to illustrate the electron migration polarization mechanism at heterogeneous interfaces. This work fills the gap of functional group‐induced structural modulation and presents new theories into the mechanism of space charge movement at heterogeneous interfaces.

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Rare earth lanthanum pinning effect for corrosion resistance ultraefficient microwave absorption FeCo@rGO composites

Cited by 17 publications

References 44 publications

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

3D Lightweight Interconnected Melamine Foam Modified with Hollow CoFe₂O₄/MXene toward Efficient Microwave Absorption

Electron Migratory Polarization of Interfacial Electric Fields Facilitates Efficient Microwave Absorption

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Rare earth lanthanum pinning effect for corrosion resistance ultraefficient microwave absorption FeCo@rGO composites

Cited by 17 publications

References 44 publications

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

3D Lightweight Interconnected Melamine Foam Modified with Hollow CoFe2O4/MXene toward Efficient Microwave Absorption

Electron Migratory Polarization of Interfacial Electric Fields Facilitates Efficient Microwave Absorption

Contact Info

Product

Resources

About

3D Lightweight Interconnected Melamine Foam Modified with Hollow CoFe₂O₄/MXene toward Efficient Microwave Absorption