MXene‐Enabled Pneumatic Multiscale Shape Morphing for Adaptive, Programmable and Multimodal Radar‐infrared Compatible Camouflage

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(24)

Published: April 5, 2024

Abstract Achieving radar‐infrared compatible camouflage with dynamic adaptability has been a long‐sought goal, but faces significant challenges owing to the limited dispersion relations of conventional material systems operating in different wavelength ranges. Here, this work proposes concept pneumatic multiscale shape morphing and design periodically arranged unit consisting MXene‐based morphable conductors intake platforms. During gas actuation, conductor transforms centimeter‐scale 2D flat sheets into 3D balloon shapes enhance microwave absorption behavior, also reconfigures micrometer‐scale MXene wrinkles smooth planes combination cavity‐induced low heat transfer minimize infrared (IR) signatures. Through theory‐guided reverse engineering, final matrix shows remarkable frequency tunability (2.64–18.0 GHz), moderate IR emissivity regulation (0.14 at 7–16.5 µm), rapid responsiveness (≈30 ms), wide‐angle operation (>45 ° ), excellent environmental tolerance. Additionally, multiplexed enables over 14 programmable coding sequences that independently alter thermal radiation without compromising radar stealth, allows multimodal switching between three distinct states. The approach may facilitate evolution techniques electromagnetic functional materials toward multispectral, intelligence.

Language: Английский

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The Elaborate Design of Multi‐Polarization Effect by Non‐Edge Defect Strategy for Ultra‐Broad Microwave Absorption

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(44)

Published: May 21, 2024

Abstract Anion defect engineering is proven to be an efficient approach reconstruct the electronic configuration of carbon‐based magnetoelectric materials for targeted modulation electromagnetic (EM) performance. However, traditional mono‐anionic doping suffers from low concentration and lacks diverse polarization mechanisms. In this work, multi‐anions (N/S/F) stepwise‐doped carbon/Fe 3 C composites are elaborately constructed, wherein predesigned N defects serve as activated sites anomalously adopting S anions (Step I) subsequent F II) in non‐marginal areas carbon layer. It found that prefers replace pyrrolic while tends form dangling bonds with site adjacent pyridinic N. Intriguingly, besides inherent polarized resonance at ≈15 GHz, customized induce new resonances ≈10 GHz ≈15+ respectively. Under a typical multi‐polarization effect synergetic magnetic response, N/S/F harvest broadest bandwidth 8.28 (9.72–18 GHz) 2.55 mm, covering wide frequency range almost X Ku bands. This work demonstrates positive impact localized multi‐defects customization on expanding microwave absorption bandwidth, providing valuable insights advanced design ultra‐broadband absorbers.

Language: Английский

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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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Metal organic frameworks derived NixSey@NC hollow microspheres with modifiable composition and broadband microwave attenuation

Carbon, Journal Year: 2024, Volume and Issue: 226, P. 119215 - 119215

Published: May 4, 2024

Language: Английский

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Mechanisms, design, and fabrication strategies for emerging electromagnetic wave-absorbing materials

Cell Reports Physical Science, Journal Year: 2024, Volume and Issue: 5(7), P. 102097 - 102097

Published: July 1, 2024

The rapid development of intelligent devices imposes new demands on electromagnetic wave (EMW)-absorbing materials, especially concerning wide-spectrum absorption, frequency band manipulation, and multifunctional integration. However, conventional investigations EMW-absorbing materials face several challenges that collectively limit the effectiveness existing amid growing demands, including ambiguous (EM) loss mechanisms, impedance mismatches, deficiencies in integrated design. This review elucidates EM delineates key bridge mechanisms linking microscopic macroscopic factors, proposes dielectric polarization models to clarify mechanisms. Additionally, it delves into unique advantages core-shell structures porous optimization. Finally, introduces fabrication approaches integrate detailing design strategies exploring potential applications. By consolidating these cutting-edge achievements, this aims guide scientific advancement materials.

Language: Английский

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Designing Electronic Structures of Multiscale Helical Converters for Tailored Ultrabroad Electromagnetic Absorption

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 17(1)

Published: Sept. 26, 2024

Abstract Atomic-scale doping strategies and structure design play pivotal roles in tailoring the electronic physicochemical property of electromagnetic wave absorption (EMWA) materials. However, relationship between configuration (EM) loss mechanism has remained elusive. Herein, drawing inspiration from DNA transcription process, we report successful synthesis novel situ Mn/N co-doped helical carbon nanotubes with ultrabroad EMWA capability. Theoretical calculation EM simulation confirm that orbital coupling spin polarization Mn–N 4 –C configuration, along cross generated by structure, endow converters enhanced loss. As a result, HMC-8 demonstrates outstanding performance, achieving minimum reflection −63.13 dB at an ultralow thickness 1.29 mm. Through precise tuning graphite domain size, HMC-7 achieves effective bandwidth (EAB) 6.08 GHz 2.02 mm thickness. Furthermore, constructing macroscale gradient metamaterials enables ultrabroadband EAB 12.16 only 5.00 mm, maximum radar section reduction value reaching 36.4 m 2 . This innovative approach not advances understanding metal–nonmetal co-doping but also realizes broadband EMWA, thus contributing to development mechanisms applications.

Language: Английский

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Hierarchical carbon nanotube-decorated polyacrylonitrile smart textiles for wearable biomonitoring

Wearable electronics., Journal Year: 2024, Volume and Issue: 1, P. 180 - 188

Published: Aug. 14, 2024

Language: Английский

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Structured carbon for electromagnetic shielding and microwave absorption from carbonization of waste Polymer: A review

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 154013 - 154013

Published: July 14, 2024

Language: Английский

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A Rapidly Assembled and Camouflage‐Monitoring‐protection Integrated Modular Unit

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

Published: Dec. 17, 2024

Optical-electromagnetic compatible devices are urgently required in intelligent building monitors and cross-band protection. Meanwhile, the insufficient systematicness semi-empirical attempts significantly limit prosperity of materials, causing enormous challenges for deviceization material database construction. Herein, systematical component-deviceization-machine learning prediction-array construction strategy is attempted to solve bottleneck issues. A luminance-triggered camouflage-monitoring-protection triune integrated modular unit (IMU) hierarchically encapsulated simultaneously achieve efficient anti-electromagnetic interference (EMI), light-absorbing, quick gradient-colorization response. Moreover, an illumination intensity dataset a surrogate model based on fully connected neural network fitting (FCNN-fitting) constructed, which accurately predicts light-absorbing property IMUs can be instructional selection. The specifically assembled into 4*4 array, aiming at multi-scenario application programmable display, camouflage pattern, surface conformality, rapid replaceability. This work paves path provides promising optical-electromagnetic compatibility genetics-deviceization-array systematization.

Language: Английский

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In-Situ Microfibrilization of Liquid Metal droplets in Polymer Matrix for Enhancing Electromagnetic Interference Shielding and Thermal Conductivity

Composites Science and Technology, Journal Year: 2024, Volume and Issue: 255, P. 110724 - 110724

Published: Aug. 1, 2024

Language: Английский

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