Multifunctional SiC@SiO2 Nanofiber Aerogel with Ultrabroadband Electromagnetic Wave Absorption

Nano-Micro Letters, Год журнала: 2022, Номер 14(1)

Опубликована: Июль 28, 2022

Traditional ceramic materials are generally brittle and not flexible with high production costs, which seriously hinders their practical applications. Multifunctional nanofiber aerogels highly desirable for applications in extreme environments, however, the integration of multiple functions preparation is extremely challenging. To tackle these challenges, we fabricated a multifunctional SiC@SiO2 aerogel (SiC@SiO2 NFA) three-dimensional (3D) porous cross-linked structure through simple chemical vapor deposition method subsequent heat-treatment process. The as-prepared NFA exhibits an ultralow density (~ 11 mg cm- 3), ultra-elastic, fatigue-resistant refractory performance, temperature thermal stability, insulation properties, significant strain-dependent piezoresistive sensing behavior. Furthermore, shows superior electromagnetic wave absorption performance minimum refection loss (RLmin) value - 50.36 dB maximum effective bandwidth (EABmax) 8.6 GHz. successful this material provides promising prospect design fabrication cutting-edge materials.

Язык: Английский

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Shape Anisotropic Chain‐Like CoNi/Polydimethylsiloxane Composite Films with Excellent Low‐Frequency Microwave Absorption and High Thermal Conductivity

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Фев. 13, 2024

Abstract The demand for low‐frequency microwave absorption materials is becoming more and urgent. Novel shape anisotropy chain‐like CoNi fabricated using polyvinylpyrrolidone as a shape‐directing agent via solvothermal method, which then mixed with polydimethylsiloxane (PDMS) to prepare corresponding multifunctional CoNi/PDMS composite films. Shape strong magnetic coupling effect of enhance natural resonance loss capability. minimum reflection (RL min ) −50.5 dB effective bandwidth (EAB) 1.04 GHz (2.64–3.68 GHz) at 3.9 mm CoNi. 18 vol% films present optimal performance RL −56.7 EAB (2.96–4.00 4.1 mm, far superior spherical −9.5 dB. Meantime, the in‐plane inter‐plane thermal conductivity coefficients are 2.05 0.61 W m −1 K , about 1.5 times higher than (1.36 0.42 ), also 220% 190% pure PDMS (0.64 0.21 ). This can broaden applications in 5G communications flexible electronics.

Язык: Английский

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The art of framework construction: hollow-structured materials toward high-efficiency electromagnetic wave absorption

Advanced Composites and Hybrid Materials, Год журнала: 2022, Номер 5(3), С. 1658 - 1698

Опубликована: Июнь 17, 2022

Язык: Английский

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Carbon Nanocoils/Carbon Foam as the Dynamically Frequency‐Tunable Microwave Absorbers with an Ultrawide Tuning Range and Absorption Bandwidth

Advanced Functional Materials, Год журнала: 2022, Номер 32(52)

Опубликована: Окт. 26, 2022

Abstract The absorption frequency of conventional microwave absorbing materials (MAMs) is hardly tuned in operando, while such dynamic regulation MAMs great significance to meet the high demands modern radars and intelligent electron devices. Here, an ingenious frequency‐tuning strategy by means pressure variations developed fabricating highly compressible carbon nanocoils/carbon foam (CNCs/CF) as a dynamically frequency‐tunable absorber. Through adjusting compression strain, bandwidth CNCs/CF can be precisely from S‐band (2−4 GHz) Ku‐band (12−18 GHz). adjustable effective wide 15.4 GHz, which covers 96% entire frequency. Under 10% shows attractive 9.0 GHz strong reflection loss −64.6 dB. Furthermore, also exhibit good thermal insulation, hydrophobicity, strain‐sensitive conductivity, endowing them with fascinating functions heat insulation self‐cleaning. method utilizing external adjust frequencies demonstrated for first time, opens avenue applications ultrawide range bandwidth.

Язык: Английский

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Advancements in Microwave Absorption Motivated by Interdisciplinary Research

Advanced Materials, Год журнала: 2023, Номер 36(4)

Опубликована: Окт. 23, 2023

Abstract Microwave absorption materials (MAMs) are originally developed for military purposes, but have since evolved into versatile with promising applications in modern technologies, including household use. Despite significant progress bench‐side research over the past decade, MAMs remain limited their scope and yet to be widely adopted. This review explores history of from first‐generation coatings second‐generation functional absorbers, identifies bottlenecks hindering maturation. It also presents potential solutions such as exploring broader spatial scales, advanced characterization, introducing liquid media, utilizing novel toolbox (machine learning, ML), proximity lab end‐user. Additionally, it meticulously compelling medicine, mechanics, energy, optics, sensing, which go beyond efficiency, along current development status prospects. interdisciplinary direction differs previous primarily focused on meeting traditional requirements (i.e., thin, lightweight, wide, strong), can defined next generation smart absorbers. Ultimately, effective utilization ubiquitous electromagnetic (EM) waves, aided by third‐generation MAMs, should better aligned future expectations.

Язык: Английский

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Macroscopic Electromagnetic Cooperative Network-Enhanced MXene/Ni Chains Aerogel-Based Microwave Absorber with Ultra-Low Matching Thickness

Nano-Micro Letters, Год журнала: 2022, Номер 14(1)

Опубликована: Июль 5, 2022

Electromagnetic cooperative strategy has been presented as a mainstream approach that can effectively optimize the matching thickness of dielectric loss dominant system. However, it is still challenging for dielectric-magnetic coexisting-type absorber to develop electromagnetic wave (EMW) performance with ultra-low (≤ 1 mm). Breaking limitation traditional response at microscopic/mesoscopic scale, ficus microcarpa-like magnetic aerogel macroscopical effect was fabricated through highly oriented self-assembly engineering. The Ni chains unique macroscopic morphology (~ cm in length) were achieved via special field-induced growth. Strong coupling observed confirmed by micromagnetic simulation. deductive calculation validates maintaining high value parameters frequencies prerequisites ultrathin absorber. networks uninterrupted and dual pathways spread entire skeleton, resulting impressive permittivity even frequencies. Consequently, exhibits remarkable EMW an mm. Thus, based on modulation parameters, this work proposed ordered structure useful suitable achieving absorbers.

Язык: Английский

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Controllable seeding of nitrogen-doped carbon nanotubes on three-dimensional Co/C foam for enhanced dielectric loss and microwave absorption characteristics

Chemical Engineering Journal, Год журнала: 2022, Номер 450, С. 138160 - 138160

Опубликована: Июль 21, 2022

Язык: Английский

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Digital Light Processing 3D-Printed Ceramic Metamaterials for Electromagnetic Wave Absorption

Nano-Micro Letters, Год журнала: 2022, Номер 14(1)

Опубликована: Май 5, 2022

Combining 3D printing with precursor-derived ceramic for fabricating electromagnetic (EM) wave-absorbing metamaterials has attracted great attention. This study presents a novel ultraviolet-curable polysiloxane precursor digital light processing (DLP) to fabricate parts complex geometry, no cracks and linear shrinkage. Guiding the principles of impedance matching, attenuation, effective-medium theory, we design cross-helix-array metamaterial model based on permittivity constant ceramics. The corresponding can be successfully prepared by DLP subsequent pyrolysis process, achieving low reflection coefficient wide effective absorption bandwidth in X-band even under high temperature. is general method that extended other bands, which realized merely adjusting unit structure metamaterials. strategy provides avenue achieve "target-design-fabricating" metamaterials, it exposes downstream applications highly efficient broad EM materials structures potential applications.

Язык: Английский

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Tuning microwave absorption properties of Ti3C2T MXene-based materials: Component optimization and structure modulation

Journal of Material Science and Technology, Год журнала: 2023, Номер 148, С. 150 - 170

Опубликована: Янв. 6, 2023

Язык: Английский

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Sequential Architecture Induced Strange Dielectric‐Magnetic Behaviors in Ferromagnetic Microwave Absorber

Advanced Functional Materials, Год журнала: 2023, Номер 33(27)

Опубликована: Март 27, 2023

Abstract The high filler loading (FL) is a bottleneck in developing lightweight ferromagnetic microwave absorbers (MAs) for the actual applications. Sequential architecture design of MAs can induce strange physical behaviors due to unique coupling‐enhancement effect between functional units, providing vast potential achieving absorption performance. However, FLs current sequential fail be designed on demand because dielectric‐magnetic cannot fulfilled. influence engineering macroscopic properties or microscopic loss mechanism still needs more exploration. Herein, based four mesoscopic models (particles, chains, bundles, and fibers) series with different architectures are prepared via bottom‐up self‐assembly method. fibrous samples exhibit best performance (−51.3 dB, 4.12 GHz) at breakthrough FL 2 wt%, which one order magnitude less than other MAs. Strange behaviors, including negative permittivity heterodromous chiral vortex, occur units lateral configurations. Further, special established reveal attenuation evolutionary mechanism. This study clarifies relationship provides new sight understand electromagnetic

Язык: Английский

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