Опубликована: Янв. 1, 2025
Язык: Английский
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Окт. 29, 2024
Abstract Thermochemical conversion is a highly effective method for upgrading organic solid wastes into high‐value materials, contributing to carbon neutrality and peak, emission goals. It also serves as pathway develop energy‐efficient electromagnetic wave absorbing (EMWA) materials. In this study, fish skin successfully in situ nitrify Prussian Blue Fe 3 N under external thermal driving condition, resulting high saturation magnetization utilized. The N@C demonstrates outstanding EMWA property, achieving minimum reflection loss of −71.3 dB. Furthermore, by introducing cellulose nanofiber, portion the iron nitride transformed carbide, C/Fe N@C. This composite exhibits enhanced properties owing wider local charge redistribution stronger electronic interactions, an absorption bandwidth ( EAB ) 6.64 GHz. Electromagnetic simulations first‐principles calculations further elucidate mechanism, maximum reduction value radar‐cross section reached 37.34 dB·m 2 . design multilayer gradient metamaterials demonstrated ultra‐broadband 11.78 paper presents efficient strategy atomic‐level biomass waste utilization prepare N, provides novel insights between metal nitrides carbides, offers promising direction development advanced
Язык: Английский
Процитировано
26
Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 157121 - 157121
Опубликована: Окт. 1, 2024
Язык: Английский
Процитировано
24
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 7, 2024
Abstract Multifunctionalization of electromagnetic wave absorbing materials (EMWAMs) presents a promising avenue for their application in complex scenarios. However, the effective integration multiple supplementary functions into EMWAMs continues to pose significant challenge. Herein, novel nanofiber elastomer (NFE) incorporating multicomponent inorganic FeS 2 /S,N co‐doped carbon nanofibers (NFs) and organic component (Ecoflex) are designed synthesized. The sulfur doping ratios species can be effectively modulated via controlling amount sulfurization temperature. optimized NFs/Ecoflex NFE not only exerted an excellent impedance matching characteristic, but also displays boosted conductive loss polarization capacities. Amongst, achieved ultra‐wide absorption bandwidth (EAB) 7.40 GHz minimum reflection (RL min ) −21.82 dB at thin thickness (≈2.00 mm). Furthermore, simultaneously greatly improved mechanical property, thermal insulation, hydrophobicity, corrosion resistance. Through designing metastructures, with periodically closed‐ring resonant structure realized EAB 32.64 (ranging from 7.36 40.00 GHz). Overall, this research contributes valuable insights design next‐generation satisfactory multifunctionalities, demonstrating potential smart devices challenging environments.
Язык: Английский
Процитировано
23
Small Methods, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 28, 2024
Abstract MXenes are 2D materials known for their unique electromagnetic wave absorption (EMWA) properties arising from varied composition and structure. In this study, a one‐step ice‐assisted process is utilized to directly transform MXene into 3D single‐layer aerogels (SMAs). Furthermore, the interlayer spacing of SMAs optimized by incorporating helical carbon nanotubes (HCNTs). Because van der Waals interaction between nanosheets HCNTs, assembled HCNT@MXene (HMAs) exhibited regular porous structure moderate conductivity, leading significantly enhanced responses, as demonstrated finite element simulation. The HMAs showed an exceptional EMWA, with minimum reflection loss −51.45 dB effective bandwidth 6.48 GHz at 3.0 wt.% filler ratio. Additionally, visualization surface charge distribution power density characteristics clarified underlying EMWA mechanisms. By employing hollow gradient metamaterial design, further expanded 13.98 GHz. maximum radar cross‐section reduction values 27.08 m 2 . Moreover, excellent thermal insulation capability. This paper presents straightforward yet method fabricating offers valuable insights development application MXene‐aerogel‐based EMW absorbers.
Язык: Английский
Процитировано
18
Carbon, Год журнала: 2025, Номер unknown, С. 120244 - 120244
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
4
Nano-Micro Letters, Год журнала: 2025, Номер 17(1)
Опубликована: Фев. 25, 2025
Abstract Magnetic absorbers with high permeability have significant advantages in low-frequency and broadband electromagnetic wave (EMW) absorption. However, the insufficient magnetic loss inherent conductivity of existing limit further expansion EMW absorption bandwidth. Herein, spinel (FeCoNiCrCu) 3 O 4 high-entropy oxides (HEO) are successfully constructed on surface FeCoNiCr 0.4 Cu 0.2 alloys (HEA) through low-temperature oxygen bath treatment. On one hand, HEO HEA different magnetocrystalline anisotropies, which is conducive to achieving continuous natural resonance improve loss. other low can serve as an impedance matching layer, magneto-electric co-modulation. When thickness 5 mm, minimum reflection (RL) value bandwidth (RL < − dB) bi-phase composites (BPHEC) reach 12.8 dB 633 MHz, respectively. The RCS reduction multilayer sample gradient characteristic 18.34 m 2 . In addition, BPHEC also exhibits temperature-stable performance, Curie temperature, oxidation resistance. maintains between 593 691 MHz from 50 150 °C. This work offers a new tunable strategy toward modulating genes for ultra-broadband megahertz
Язык: Английский
Процитировано
3
Small Methods, Год журнала: 2024, Номер unknown
Опубликована: Окт. 3, 2024
Abstract Structural design and interface regulation are useful strategies for achieving strong electromagnetic wave absorption (EMWA) broad effective bandwidth ( EAB ). Herein, a monomer‐mediated strategy is employed to control the growth of covalent organic framework (COF) wrapping flower‐shaped Gd‐doped FeNi 3 (GFN), novel raspberry‐like absorbent based on biomimetic fabricated by thermal catalysis. Further, unique dielectric‐magnetic synergistic system constructed utilizing COF‐derived nitrogen‐doped porous carbon (NPC) as shell anisotropic GFN core. The parameters GFN@NPC composites can be tuned adjusting proportions NPC. Off‐axis electron holography results further clarify polarization microscale magnetic interactions affecting EMW loss mechanism. As result, samples exhibit EMWA performance. values all reach up 6.0 GHz, with GFN@NPC‐2 sample showing minimum reflection RL min ) −69.6 dB at 1.68 mm. In addition, achieves maximum radar cross–section (RCS) reduction 29.75 dB·m 2 . A multi‐layer gradient structure also using metamaterial simulation achieve an ultra‐wide 12.24 GHz. Overall, this work provides bio‐inspired develop high‐performance materials.
Язык: Английский
Процитировано
18
Applied Surface Science, Год журнала: 2025, Номер 687, С. 162303 - 162303
Опубликована: Янв. 5, 2025
Язык: Английский
Процитировано
2
Journal of Advanced Ceramics, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
Ceramic materials have obvious advantages in thermal stability, but impedance mismatch limited their ability to attenuate electromagnetic (EM) waves. Herein, a novel series of high-entropy (V0.2Nb0.2Zr0.2Ta0.2X0.2)B2 (X=Mo, Ti, Hf) ceramics were successfully and rapidly synthesized using the ultrafast high-temperature sintering (UHS) method based on joule heating. The results indicated that effect component control magnetic loss system was relatively small, dielectric larger. Among them, HEB-Ti sample demonstrated superior absorbing properties, attributed its moderate optimal EM matching. At same time, because attenuation constant, it can achieve maximum penetration wave minimum reflection after wave. As result, (RLmin) as low –40.7 dB, effective absorption band covered entire frequency range from 2 8 GHz. Its excellent performance mainly due synergistic various mechanisms, including defect polarization, dipole conduction loss. Furthermore, thermogravimetric (TG) analysis showed exhibited stability could withstand up 550 °C air 1000 argon gas environment. relevant work provided meaningful references for design new high-performance ceramic wave-absorbing materials.
Язык: Английский
Процитировано
2
Materials Today Physics, Год журнала: 2025, Номер unknown, С. 101662 - 101662
Опубликована: Янв. 1, 2025
Язык: Английский
Процитировано
1