Tailoring electromagnetic responsiveness of Tremella-like multi-dimensional heterostructures through a self-decomposition strategy

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 157121 - 157121

Published: Oct. 1, 2024

Language: Английский

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Enhanced Electromagnetic Energy Conversion in an Entropy‐driven Dual‐magnetic System for Superior Electromagnetic Wave Absorption

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 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

Language: Английский

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Mechanically Robust and Thermal Insulating Nanofiber Elastomer for Hydrophobic, Corrosion‐Resistant, and Flexible Multifunctional Electromagnetic Wave Absorbers

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 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.

Language: Английский

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Ultra-wide microwave absorption with thin thickness in multi-layered Fe3O4-coated FeSiCr composites

Applied Surface Science, Journal Year: 2025, Volume and Issue: 687, P. 162303 - 162303

Published: Jan. 5, 2025

Language: Английский

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Synthesis of novel high-entropy diborides with high-efficiency electromagnetic wave absorption and excellent thermal stability

Journal of Advanced Ceramics, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 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 (V_0.2Nb_0.2Zr_0.2Ta_0.2X_0.2)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, (RL_min) 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.

Language: Английский

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One‐Click to 3D: Helical Carbon Nanotube‐Mediated MXene Hierarchical Aerogel with Layer Spacing Engineering for Broadband Electromagnetic Wave Absorption

Small Methods, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 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.

Language: Английский

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Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi₃@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation

Small Methods, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 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.

Language: Английский

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Synergistic Enhancement of Radar Wave Absorption in SiC/Al2O3 Composites via Structural Tuning, Composition Optimization, and Unit Design

Materials Today Physics, Journal Year: 2025, Volume and Issue: unknown, P. 101662 - 101662

Published: Jan. 1, 2025

Language: Английский

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A robust hierarchical MXene nanocomposite by valid magnetoelectric coordination for efficient electromagnetic response

Materials Today Nano, Journal Year: 2025, Volume and Issue: 29, P. 100584 - 100584

Published: Feb. 7, 2025

Language: Английский

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Plasma‐Induced Geometry Engineering in High‐Entropy Oxide Composites for Superior Electromagnetic Absorption

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 13, 2025

Abstract The dielectric and magnetic coexistence behavior of high entropy oxides (HEOs) injects infinite dynamism in promoting electromagnetic wave (EMW) absorption, but precisely constructing their regular geometries at the nanoscale remains challenging. Herein, controlled preparation reduced graphite oxide loaded (CoFeNiCuMn)O with various by a rapid plasma process is reported. Modifying only metal content precursor can effectively influence morphology properties resulting derivatives, achieving well‐matched impedance ensuring outstanding absorption performance. results show that truncated octahedral HEO/RGO composite exhibits strongest absorbing capacity, minimum reflection loss −57 dB 14.1 GHz corresponding effective bandwidth covering 4.13 GHz. Moreover, constitutive relationship between multi‐element synergies microwave characteristics systematically explored, mechanism proposed. Delayed wireless charging time simulated values RCS less than −10 dBm 2 whole detection angles further demonstrate its dissipation capability practical application scenarios. This study not enriches variety lightweight efficient materials also guides for new configuration design HEOs.

Language: Английский

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