Mesoporous carbon spheres modified with atomically dispersed iron sites for efficient electromagnetic wave absorption

Carbon, Journal Year: 2024, Volume and Issue: 231, P. 119699 - 119699

Published: Oct. 10, 2024

Language: Английский

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Electromagnetic wave absorbing metastructure for high-temperature resistant and broadband application

Materials Today Nano, Journal Year: 2025, Volume and Issue: 29, P. 100572 - 100572

Published: Jan. 6, 2025

Language: Английский

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Carbon Nanocoils‐Assisted Formation of Tunable Pore Graphene Aerogels for Lightweight Broadband Microwave Absorption, Thermal Insulation, and Antifreeze Devices

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 9, 2025

The rational design of the aerogel pore structure facilitates maximum excitation materials physicochemical properties, which enables modulation their electromagnetic performance. However, controllable adjustment remains a significant challenge. Here, freeze-thawing process and thermal annealing treatment are introduced to prepare reduced graphene oxide (rGO)/iron (Fe)/carbon nanocoil (CNC) aerogels. composite aerogels with tunable obtained by adjusting content CNC. Both experiments simulations confirm that addition CNC presents continuous 3D conductive network, improves conductivity loss polarization loss. Meanwhile, amorphous carbon within causes structural defects, further enhance Therefore, rGO/Fe/CNC optimized has lightweight efficient wave absorption. At an ultra-low filling ratio 0.8 wt%, effective absorption bandwidth reaches 7.9 GHz optimal reflection is -43.5 dB. In addition, due network interwoven temperature stability nanomaterials, have excellent insulation, antifreeze performance, hydrophobicity. This multifunctional absorber great potential for application in complex changing environments.

Language: Английский

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Recycling red mud with raw coal to low-cost Fe/C/ceramic composite for efficient microwave absorption

Environmental Technology, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 14

Published: Feb. 16, 2025

To solve the urgent issue of electromagnetic (EM) wave radiation pollution and promote resource utilisation red mud (RM, a solid waste), Fe/C/ceramic composite EM wave-absorbing materials were constructed by recycling RM with raw coal (RC) through simple mechanical mixing then carbothermal reduction between Fe2O3 in carbon component RC. It was found that calcined temperature 900 °C can be considered optimal formation for Fe. In addition, tuneable absorption performance could attained regulating mass ratio RC to (denoted as MRC:MRM). When MRC:MRM value reaches 0.4:1 0.5:1, composites exhibit more favourable performance. The showed minimum reflection loss (RLmin) −41.6 dB, accompanied an effective bandwidth (EAB) 3.2 GHz when simulating thickness 2 mm. 0.5:1 possessed maximum EAB 4.2 RLmin −25.3 dB at 1.5 satisfactory profits from good impedance matching strong intrinsic attenuation capability. former attributed regulatable parameters multicomponent system; latter is mainly credited dielectric arising medium graphitised carbon, highly crystalline Fe, plentiful defects interfaces composites. This work not only provides valid path realise economical preparation microwave absorbents but also achieves rational disposal RM.

Language: Английский

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Bifunctional ceramic material: Li doping enhances the electromagnetic wave absorption and infrared stealth performance of SnO2 ceramics

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2025, Volume and Issue: unknown, P. 136462 - 136462

Published: Feb. 1, 2025

Language: Английский

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