Chemical Engineering Journal, Год журнала: 2024, Номер 481, С. 148354 - 148354
Опубликована: Янв. 4, 2024
Язык: Английский
Advanced Materials, Год журнала: 2024, Номер 36(24)
Опубликована: Апрель 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.
Язык: Английский
Процитировано
110
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Март 7, 2024
Abstract Promoting advanced functional films that integrate protective behaviors for synergetic radar, infrared (IR), and visible light is confronted with extreme challenges. The effective integration of shielding capacity IR camouflage into single‐component carbon remains an enormous challenge because limited conductivity high absorption. In this work, nanotube (CNT) excellent electromagnetic interference (EMI) shielding, switchable camouflage, energy conversion are obtained via a (FCCVD) method subsequent defect engineering strategies induced by temperature (Strategy I) N/S co‐doping II). Wherein the effect on electronic configuration as well multi‐spectra performance deeply explored. Ascribing to synergistic effects strategies, defective CNT present superior EMI effectiveness (SE) absorption ratio 86.9%, large span emissivity (0.479), which provides necessary condition various application scenarios. Under applied electric field excitation, radiation can adapt rapidly changing surroundings, such low‐high/high‐low temperatures. Besides, desirable de‐icing be achieved. This work supplies feasible strategy designing EM absorption, adaptive confront multiband surveillance.
Язык: Английский
Процитировано
107
Advanced Functional Materials, Год журнала: 2024, Номер 34(44)
Опубликована: Май 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.
Язык: Английский
Процитировано
97
Carbon, Год журнала: 2024, Номер 221, С. 118925 - 118925
Опубликована: Фев. 10, 2024
Язык: Английский
Процитировано
91
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Март 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.
Язык: Английский
Процитировано
90
Carbon, Год журнала: 2024, Номер 226, С. 119215 - 119215
Опубликована: Май 4, 2024
Язык: Английский
Процитировано
71
Advanced Science, Год журнала: 2024, Номер 11(19)
Опубликована: Март 14, 2024
Abstract Improving interface connectivity of magnetic nanoparticles in carbon aerogels is crucial, yet challenging for assembling lightweight, elastic, high‐performance, and multifunctional architectures. Here, an situ growth strategy to achieve high dispersion metal–organic frameworks (MOFs)‐anchored cellulose nanofibrils enhance the connection quality proposed. Followed by a facile freeze‐casting carbonization treatment, sustainable biomimetic porous with highly dispersed closely connected MOF‐derived nano‐capsules are fabricated. Thanks tight bonding nano‐capsule microstructure, these showcase remarkable mechanical robustness flexibility, tunable electrical conductivity magnetization intensity, excellent electromagnetic wave absorption performance. Achieving reflection loss −70.8 dB broadened effective bandwidth 6.0 GHz at filling fraction merely 2.2 wt.%, leading specific −1450 mm −1 , surpassing all carbon‐based aerogel absorbers so far reported. Meanwhile, manifests sensing sensibility thermal insulation. This work provides extendable synthesizing MOF‐modified nanofibril structures, thereby promoting development high‐value‐added applications compatibility protection, management, diversified sensing, Internet Things devices, aerospace.
Язык: Английский
Процитировано
65
Advances in Colloid and Interface Science, Год журнала: 2024, Номер 327, С. 103143 - 103143
Опубликована: Апрель 4, 2024
Язык: Английский
Процитировано
61
Nano-Micro Letters, Год журнала: 2024, Номер 16(1)
Опубликована: Апрель 22, 2024
Abstract The utilization of electromagnetic waves is rapidly advancing into the millimeter-wave frequency range, posing increasingly severe challenges in terms pollution prevention and radar stealth. However, existing absorbers are still inadequate addressing these issues due to their monotonous magnetic resonance pattern. In this work, rare-earth La 3+ non-magnetic Zr 4+ ions simultaneously incorporated M-type barium ferrite (BaM) intentionally manipulate multi-magnetic behavior. By leveraging contrary impact on magnetocrystalline anisotropy field, restrictive relationship between intensity successfully eliminated. peak-differentiating imitating results confirm that significant phenomenon emerges around 35 GHz reinforced exchange coupling effect Fe 2+ ions. Additionally, Mössbauer spectra analysis, first-principle calculations, least square fitting collectively identify additional doping leads a profound rearrangement occupation thus makes portion polarization/conduction loss increase gradually. As consequence, –Zr co-doped BaM achieves an ultra-broad bandwidth 12.5 + covering from 27.5 40 GHz, which holds remarkable potential for atmospheric window GHz.
Язык: Английский
Процитировано
57
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Окт. 8, 2024
Abstract Energy‐efficient building materials are eye‐catching for reducing indoor energy consumption via eliminating electromagnetic interference and pollution, controlling the thermal transfer, promoting sunlight harvesting providing a comfortable living environment. To realize broadband microwave shielding, elaborate control of microstructures has showed great potential research direction. By composition regulation structure design with various dimension, synergistic effects including conductive networks, interfacial polarization, magnetic coupling, dipole dielectric‐magnetic synergy, can significantly improve (EM) shielding capacity. Thermal management conversion, storage, radiation, conduction enormous in enhancing sustainability efficiency future buildings. Smart windows able to switch optical transmittance colors, which is contributed saving energy. Herein, this review, recent progress management, smart window field energy‐efficient buildings summarized, from aspects materials, mechanisms, scenarios. Further, main bottlenecks problems discussed, opportunities further highlighted.
Язык: Английский
Процитировано
54