Chemical Engineering Journal, Год журнала: 2024, Номер 481, С. 148354 - 148354
Опубликована: Янв. 4, 2024
Язык: Английский
Nano Letters, Год журнала: 2024, Номер 24(8), С. 2652 - 2660
Опубликована: Фев. 16, 2024
Ideal radar absorbing materials (RAMs) require instantaneous, programmable, and spontaneous adaptability to cope with a complex electromagnetic (EM) environment across the full working frequency. Despite various material systems adaptive mechanisms having been demonstrated, it remains formidable challenge integrate these benefits simultaneously. Here, we present pneumatic matrix that couples morphable MXene/elastomer conductors dielectric spacers, which leverages controllable airflow reconfigure spatial structure between flat sheet hemispherical crown while maintaining resistance stability via wrinkle folding unfolding. The interdimensional reconfigurations drastically induce multiple resonance behavior, enabling remarkable frequency tunability (144.5%), ultrawide bandwidth (15 GHz), weak angular dependence (45° incidence), ultrafast responsiveness (∼30 ms), excellent reproducibility (1000 cycles). With multichannel fluidic conceptual automated control systems, final device demonstrates multiplexed, autonomous transformable mode builds promising platform for smart cloaking.
Язык: Английский
Процитировано
50
Advanced Functional Materials, Год журнала: 2023, Номер 34(10)
Опубликована: Ноя. 22, 2023
Abstract To design and develop efficient microwave absorbents via phase engineering is still less studied. The unique properties caused by constructing heterophase structure hold the potential to strengthen absorbing capability toward radiation. Herein, amorphous/crystalline γ‐Fe 2 O 3 nanosheets (Fe‐H) are carefully fabricated through a controlled annealing process. matched Fermi levels formed on both sides of interface not only provides interfacial polarizations but also facilitates transport electrons with scattering over whole Fe‐H nanosheets. Thereby, conduction loss dielectric polarization relaxation promoted, leading strengthened attenuation electromagnetic wave as‐synthesized sample exhibited minimum reflection ‐89.5 dB centered at thickness 2.00 mm, associated an effective absorption bandwidth (reflection ≤ ‐10 dB) reaching 6.45 GHz. All these behaviors superior its pure amorphous absorbent bare crystalline counterpart. Furthermore, this strategy valid when extended Co Ni based oxides, suggesting universality generality for promoting absorption. Henceforth, study indicates favorable synthesis application materials as absorbents.
Язык: Английский
Процитировано
45
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Фев. 5, 2024
Abstract The emergence and widespread adoption of fifth‐generation wireless technology in civilian sectors have advanced the information revolution, while simultaneously leading to a variety negative impacts. Foremost issues domain include electromagnetic (EM) pollution, interference, inefficient use EM energy. Despite growing global awareness, progress devising effective solutions is sluggish, underlining complexity these issues. delay addressing concerns arises from several factors, including considerable gap comprehensive understanding absence unified stance on critical Moreover, new challenges like interference energy inefficiency indicates clear need for innovative ideas approaches. Addressing extends beyond inherent properties absorbers, requiring combination tailored macro‐structural designs external field management solution. This situation emphasizes urgent diverse strategies creative thinking navigate posed by perspective underscores identified systematically proposes practical approaches each, aiming foster both conversation action this crucial area. insights provided are expected substantially aid confronting alleviating pressing concerns.
Язык: Английский
Процитировано
44
Journal of Material Science and Technology, Год журнала: 2024, Номер 206, С. 211 - 220
Опубликована: Апрель 25, 2024
Язык: Английский
Процитировано
43
Carbon, Год журнала: 2024, Номер 223, С. 119017 - 119017
Опубликована: Март 4, 2024
Язык: Английский
Процитировано
41
ACS Nano, Год журнала: 2024, Номер 18(14), С. 9798 - 9822
Опубликована: Март 29, 2024
Extreme climates have become frequent nowadays, causing increased heat stress in human daily life. Personal thermal management (PTM), a technology that controls the body's microenvironment, has promising strategy to address stress. While effective ordinary environments, traditional high-performance fibers, such as ultrafine, porous, highly thermally conductive, and phase change materials, fall short when dealing with harsh conditions or large temperature fluctuations. Aerogels, third-generation superinsulation material, garnered extensive attention among researchers for their applications building energy conservation, transportation, aerospace, attributed extremely low densities conductivity. aerogels historically faced challenges related weak mechanical strength limited secondary processing capacity, recent advancements witnessed notable progress development of wearable PTM. This underscores potential within serving self-powered smart devices sensors. Review offers timely overview PTM particular focus on wearability suitability. Finally, discussion classifies five types based aerogel function: insulation, heating, cooling, adaptive regulation (involving cooling), utilization devices.
Язык: Английский
Процитировано
40
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Апрель 4, 2024
Abstract Single‐atom (SA) nanozymes have unprecedented physicochemical performance due to their integrated merits of both atomically dispersed metal atoms and bio‐enzymes. However, the structure‐function relationship between SA nanozyme‐like structure its dielectric is still unclear. Furthermore, controllable synthesis structures remains challenging unique five‐coordinated configurations. Here, a dicyandiamide‐mediated pyrolysis strategy proposed anchor five nitrogen‐coordinated lanthanum (La)–N 5 moieties on interconnected N‐doped graphene nanocages (La‐N /ING). Theoretical predictions indicate that spatially coordinated La–N exhibit significantly enhanced conduction loss polarization compared 4 moieties, as evidenced by experimental results. Moreover, polydimethylsiloxane‐coated chemically cross‐linked film constructed La‐N /ING aramid nanofibers has outstanding electromagnetic wave (EMW) absorption with an effective bandwidth (EAB 10 ) 6.24 GHz at thickness merely 2.0 mm, outperforming those most reported carbon‐based films. Importantly, also excellent flexibility, hydrophobicity, mechanical strength, structural stability, ensuring application potential in practical environments. These findings provide crucial insights into microscopic environment properties host materials, critical method for preparation multifunctional films spatial SA.
Язык: Английский
Процитировано
33
Composites Science and Technology, Год журнала: 2024, Номер 253, С. 110661 - 110661
Опубликована: Май 13, 2024
Язык: Английский
Процитировано
32
Composites Part B Engineering, Год журнала: 2024, Номер 274, С. 111243 - 111243
Опубликована: Фев. 2, 2024
Язык: Английский
Процитировано
30
Materials Today Physics, Год журнала: 2024, Номер 41, С. 101355 - 101355
Опубликована: Фев. 1, 2024
Язык: Английский
Процитировано
28