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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Shell engineering afforded dielectric polarization prevails and impedance amelioration toward electromagnetic wave absorption enhancement in nested‐network carbon architecture

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 501, P. 157556 - 157556

Published: Nov. 16, 2024

Language: Английский

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Nitrogen-doped carbon nanotubes-locally-grown three-dimensional CeO2/C/Co foam enabling fabulous hydrophobicity, thermal insulation, and highly efficient microwave absorption

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160007 - 160007

Published: Jan. 1, 2025

Language: Английский

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Dimensional Design of Cellulose Aerogels with Schottky Contact for Efficient Microwave Absorption

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

Published: Feb. 5, 2025

Cellulose aerogels, as a novel class of carbon-based materials, exhibit immense potential in the field microwave absorption (MWA) due to their biocompatibility, low density, unique porous structure, and tunable architecture. However, development multi-dimensional components with specialized heterogeneous structures, which are based on cellulose remains significant challenge. This 0D/1D/3D structural configuration facilitates electromagnetic properties favorable impedance matching. The Schottky contact at ZnO/Ni interface, particular, induces strong interfacial polarization, design results multiple heterointerfaces. Density functional theory (DFT) calculations reveal that barrier causes band bending, facilitating directed migration electrons interface formation an internal electric field, thus significantly accelerating multipolar relaxation process. As anticipated, CCMC/ZnO@Ni aerogel exhibits minimum reflection loss (RLmin) value -64.0 dB 13.9 GHz thickness 2.0 mm, its effective bandwidth (EAB) reaches 4.9 GHz. work gives valuable guidance inspiration for materials composed dimensional gradient holds great application wave (EMW) attenuation.

Language: Английский

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Structurally resilient carbon nanofiber aerogels from aramid nanofibers for thermal insulation under extreme conditions

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 159507 - 159507

Published: Jan. 1, 2025

Language: Английский

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Modulation of Dielectric Behavior in Ceramic‐Based Materials for Integrated Electromagnetic Waves Absorption and Thermal Conduction

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

Published: Jan. 16, 2025

Abstract Multifunctional materials that muster electromagnetic waves absorption (EMA) and thermal conduction features are highly desirable in electronic packaging of advanced electronics. However, traditional carbon‐based ceramic‐based often rely on semiempirical rules when preparing these bifunctional composites because incompatibility between dielectric behavior conductivity. Herein, two (SiC@RGO/EP (SCGE) Si 3 N 4 @RGO/EP (SNGE)) with different obtained by assembling 1D ceramics whiskers 2D graphene sheets to construct 3D porous skeleton followed epoxy (EP) encapsulation understand this underlying relationship. Since semiconductor‐type silicon carbide (SiC) enhance the conductivity response material, thereby significantly intensifying loss, SCGE material harvests remarkable minimal reflection loss values (RL min ) −85.92 dB at 2.07 mm, which outperform reported SiC‐based EMA so far. Whereas SNGE prepared introducing insulator nitride (Si only delivers (0.86 W m −1 K close (0.93 ), but performance is dramatically reduced RL −19.88 5 mm. The finding work offers new insights for modulating ceramic achieve integration functions.

Language: Английский

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Lightweight magnetic carbon nanotube/cellulose nanofibre aerogels with microstructure engineering for enhanced microwave absorption

Carbon, Journal Year: 2025, Volume and Issue: unknown, P. 120020 - 120020

Published: Jan. 1, 2025

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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Anion Doping as a “Trigger” to Modulate Defect‐Tailored Dielectric Coupling for Ultrathin Microwave Absorber

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

Published: Dec. 1, 2024

Abstract Anion doping engineering is recognized as a prospective strategy to adjust the electronic configuration and transport capacity of carbon‐based magnetoelectric hybrids optimize defects for modulation electromagnetic (EM) properties. This study effectively accomplishes an overwhelming enhancement in dielectric coupling between conduction polarization CuCo bimetallic/carbon system by employing situ (N, O)/ex (S, Se) defect strategies. The well‐designed lattice distortions are facilitated large atomic radii (Se) intercalated carbon skeleton bimetallic CuCo, which activate reinforcement dipole high‐frequency region. Interestingly, appropriate number vacancies acts “electron traps” accelerate local charge redistribution, endowing with extremely strong interactions interface‐induced polarization. It remarkable that ultra‐thin feature (1.8 mm) able achieve extraordinary microwave attenuation (‒56.1 dB). Additionally, specific upgrading anionic Se beneficially hinders development phonon transmission, conferring Cu 2 Se/CoSe /NC‐Se aerogel outstanding infrared stealth capabilities along inheriting advantages traditional (lightness, compressive/structural stability, hydrophobicity/anti‐corrosive properties). research offers distinctive perspectives on advanced design multifunctional absorbers complex environments.

Language: Английский

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A Pomegranate‐Like Nanolayer Featuring A Core‐Shell Architectural Design for Thermal‐Mechanical‐Electromagnetic Responses and Sensor

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

Published: Dec. 12, 2024

Abstract Multifunctional electromagnetic wave (EMW) absorbing materials are attracting attention because of their potential applications in medical, livelihood, and military. In this study, a pomegranate‐like nanolayer featuring core‐shell architecture (PNCS) is prepared using confinement strategy. Introducing metal atoms into unique design (M‐PNCS, M = Mn, Fe, Co, Ni, Cu) effectively tuned the response improved functions. The Mn‐PNCS composite exhibited highest absorption. Its reflection loss ( RL ) reached −62.39 dB with an effective absorption bandwidth (EAB) at 1.8 mm 6.0 GHz. As charge transport capacity increases, its can be transformed shielding, green shielding index up to 3.54. On basis, used fabricate multifunctional film new strain sensor. This integrated absorption, thermal insulation, hydrophobicity, flexibility, sensing, thus showing for use wearable protective clothing. addition, sensors simulation achieved sensing through coupling effect between patterns. These findings demonstrate that excellent material technical fields EMW devices.

Language: Английский

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