Controllable Atomic Migration in Microstructures and Defects for Electromagnetic Wave Absorption Enhancement

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

Published: March 25, 2024

Abstract Defects and microstructures have been utilized to effectively modulate electromagnetic (EM) wave absorption for mitigating pollution stealth issues. However, precisely feasibly tailoring them still remains challenging. Here, by using a multilevel hollow cobalt sulfide embedded in heteroatomic sulfur (S) ‐doped carbon aerogel, preferential reaction strategy of modulating point defects via controllable S atoms migration is proposed improve the EM absorption. contribute creation structures Kirkendall effects, as well inducing lattice through doping. More significantly, mechanisms prioritizing formation over discovered, with low‐velocity atomic primarily microstructure interfacial polarization impedance matching, high‐velocity atom focused on introducing achieve conductive loss. The resulting aerogel exhibits an exceptionally maximum reflection loss −52.82 dB effective bandwidth 8.82 GHz, which far exceeds most currently reported materials. Experimental theoretical approaches, including microwave heating, Tesla interaction, first principles, far‐field simulation, are comprehensively employed verify its effect mechanism. Furthermore, combination excellent infrared self‐cleaning properties opens up potential applications complex environments.

Language: Английский

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2D/2D coupled MOF/Fe composite metamaterials enable robust ultra–broadband microwave absorption

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 5, 2024

Abstract The combination between macroscopic structure designs and microscopic material offers tremendous possibilities for the development of advanced electromagnetic wave (EMW) absorbers. Herein, we propose a metamaterial design to address persistent challenges in this field, including narrow bandwidth, low–frequency bottlenecks, and, particularly, urgent issue robustness (i.e., oblique, polarized incidence). Our absorber features semiconductive metal-organic framework/iron 2D/2D assembly (CuHT–FCIP) with abundant crystal/crystal heterojunctions strong magneto-electric coupling networks. This achieves remarkable EMW absorption across broad range (2 40 GHz) at thickness just 9.3 mm. Notably, it maintains stable performance against oblique incidence (within 75°) polarizations (both transverse electric magnetic). Furthermore, demonstrates high specific compressive strength (201.01 MPa·cm 3 ·g −1 ) low density (0.89 g·cm −3 ). advancement holds promise developing robust absorbers superior performance.

Language: Английский

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Molecular Intercalation‐Induced Two‐Phase Evolution Engineering of 1T and 2H‐MS₂ (M = Mo, V, W) for Interface‐Polarization‐Enhanced Electromagnetic Absorbers

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

Published: May 10, 2024

Abstract Polarization at interfaces is an important loss mechanism for electromagnetic wave (EMW) attenuation, though the motion behavior of carriers in composed different types conductors has yet to be investigated. Tuning phase structure transition metal dichalcogenides (TMDs) MS 2 (M = Mo, V, W) by organics small molecule intercalation achieve modulation interfacial effective strategy, where 1T‐MS exhibits metallic properties and 2H‐MS semiconducting properties. To exclude contribution intrinsic TMDs materials, three (MoS , VS WS ), which also possess transitions, are Among them, composite excellent EMW absorption performance under synergistic effect polarization conduction loss. 1T‐MoS /MOF‐A best with RL min −61.07 dB a thickness 3.0 mm EAB 7.2 GHz 2.3 mm. The effectiveness using 1T‐phase 2H‐phase demonstrated, analysis carrier during

Language: Английский

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Interface Engineering of Titanium Nitride Nanotube Composites for Excellent Microwave Absorption at Elevated Temperature

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: April 4, 2024

Abstract Currently, the microwave absorbers usually suffer dreadful electromagnetic wave absorption (EMWA) performance damping at elevated temperature due to impedance mismatching induced by increased conduction loss. Consequently, development of high-performance EMWA materials with good matching and strong loss ability in wide spectrum has emerged as a top priority. Herein, high melting point, electrical conductivity, excellent environmental stability, EM coupling effect, abundant interfaces titanium nitride (TiN) nanotubes, they were designed based on controlling kinetic diffusion procedure Ostwald ripening process. Benefiting from boosted heterogeneous between TiN nanotubes polydimethylsiloxane (PDMS), enhanced polarization relaxations created, which could not only improve depletion efficiency EMWA, but also contribute optimized temperature. Therefore, nanotubes/PDMS composite showed performances varied (298–573 K), while achieved an effective bandwidth (EAB) value 3.23 GHz minimum reflection (RL min ) − 44.15 dB 423 K. This study clarifies relationship dielectric capacity (conduction loss) temperature, breaks new ground for interface engineering.

Language: Английский

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3D-Printed Liquid Metal-in-Hydrogel Solar Evaporator: Merging Spectrum-Manipulated Micro-Nano Architecture and Surface Engineering for Solar Desalination

ACS Nano, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 8, 2024

Solar desalination driven by interfacial heating is considered a promising technique to alleviate the freshwater shortage crisis. However, its further extension and application are confined factors such as highlighted salt accumulation, inferior energy efficiency, poor durability. Herein, microsized eutectic gallium–indium (EGaIn) core–shell nanodroplet (denoted LMTE) with photo-cross-linking photothermal traits, stabilized allyl glycidyl ether (AGE)-grafting tannic acid (TA), explored solar absorber for broadband light absorbing localized micro-nano heat channeling. The LMTE nanodroplets formulated directly highly hydrated polymers photosensitive species successfully develop water-based ink suitable digital processing (DLP) 3D printing. As demonstration, composite hydrogel-forged milli-conical needle arrays metal-phenolic network (MPN)-engineered wettability enhancement can be printed designed rationally via bottom-up strategy. 3D-printing hydrogel evaporator composed of spectrum-tailored EGaIn efficient photon harvesting MPN-coated milli-cone water supplying channeling, which function cooperatively bestow superior solar-powered evaporation (2.96 kg m–2 h–1, 96.93% efficiency) excellent (salt cycle site-specific crystallization). Furthermore, robust steam generating/collecting system demonstrated, providing valuable guidance building water-energy-agriculture nexus.

Language: Английский

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Metastructure based broadband structural stealth with material-structure-function integration

Composites Science and Technology, Journal Year: 2024, Volume and Issue: 253, P. 110661 - 110661

Published: May 13, 2024

Language: Английский

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Multi‐Physical Lattice Metamaterials Enabled by Additive Manufacturing: Design Principles, Interaction Mechanisms, and Multifunctional Applications

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

Abstract Lattice metamaterials emerge as advanced architected materials with superior physical properties and significant potential for lightweight applications. Recent developments in additive manufacturing (AM) techniques facilitate the of lattice intricate microarchitectures promote their applications multi‐physical scenarios. Previous reviews on have largely focused a specific/single field, limited discussion properties, interaction mechanisms, multifunctional Accordingly, this article critically design principles, structure‐mechanism‐property relationships, enabled by AM techniques. First, are categorized into homogeneous lattices, inhomogeneous other forms, whose principles processes discussed, including benefits drawbacks different fabricating types lattices. Subsequently, structure–mechanism–property relationships mechanisms range fields, mechanical, acoustic, electromagnetic/optical, thermal disciplines, summarized to reveal critical principles. Moreover, metamaterials, such sound absorbers, insulators, manipulators, sensors, actuators, soft robots, management, invisible cloaks, biomedical implants, enumerated. These provide effective guidelines

Language: Английский

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3D phase gradient induced surface wave torsion metastructure for anomalous electromagnetic damage tolerance

Composites Science and Technology, Journal Year: 2025, Volume and Issue: 262, P. 111088 - 111088

Published: Jan. 31, 2025

Language: Английский

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Advanced 3D printing accelerates electromagnetic wave absorption from ceramic materials to structures

Deleted Journal, Journal Year: 2025, Volume and Issue: 2(1)

Published: Jan. 22, 2025

Language: Английский

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Sandwich‐Like CNTs/Carbon@Si₃N₄ Porous Foam for Temperature‐Insensitive Electromagnetic Wave Absorption

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

Published: Jan. 26, 2025

Abstract Despite considerable efforts to tune the morphology and composition from macroscopic level nanoscale of electromagnetic wave‐absorbing materials (EWMs), achieving strong wide‐bandwidth absorption under a temperature‐variant environment remains extremely difficult due temperature‐sensitive electromagnetic‐absorbing mechanisms that involve dipole polarization conductive loss. Here, by integrating highly carbon nanotubes (CNTs) networks temperature‐stable silicon nitride (Si 3 N 4 ) protective layer, CNTs/amorphous carbon@Si (C‐CNT‐Si porous foam composed sandwich‐like Si /C‐CNT/Si strut, which exhibits excellent temperature‐insensitive properties room temperature 600 °C, is demonstrated. To be specific, value minimum reflection loss always lower than −50 dB, effective absorbing bandwidth covering whole X band throughout thickness range 4.8–6.1 mm achieved. The superior property synergistic effects irregular derived lattice vacancies heterogeneous interface, slightly increased decreasing carrier mobility, increasing concentration rising environment.

Language: Английский

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