Carbohydrate Polymers, Год журнала: 2025, Номер 362, С. 123679 - 123679
Опубликована: Апрель 28, 2025
Язык: Английский
Small, Год журнала: 2025, Номер unknown
Опубликована: Фев. 5, 2025
Cellulose aerogels, as a novel class of carbon-based materials, exhibit immense potential in the field microwave absorption (MWA) due to their biocompatibility, low density, unique porous structure, and tunable architecture. However, development multi-dimensional components with specialized heterogeneous structures, which are based on cellulose remains significant challenge. This 0D/1D/3D structural configuration facilitates electromagnetic properties favorable impedance matching. The Schottky contact at ZnO/Ni interface, particular, induces strong interfacial polarization, design results multiple heterointerfaces. Density functional theory (DFT) calculations reveal that barrier causes band bending, facilitating directed migration electrons interface formation an internal electric field, thus significantly accelerating multipolar relaxation process. As anticipated, CCMC/ZnO@Ni aerogel exhibits minimum reflection loss (RLmin) value -64.0 dB 13.9 GHz thickness 2.0 mm, its effective bandwidth (EAB) reaches 4.9 GHz. work gives valuable guidance inspiration for materials composed dimensional gradient holds great application wave (EMW) attenuation.
Язык: Английский
Процитировано
12
Carbon, Год журнала: 2025, Номер unknown, С. 120233 - 120233
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
8
Composites Part A Applied Science and Manufacturing, Год журнала: 2025, Номер unknown, С. 108751 - 108751
Опубликована: Янв. 1, 2025
Язык: Английский
Процитировано
5
Journal of Advanced Ceramics, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
Ceramic materials have obvious advantages in thermal stability, but impedance mismatch limited their ability to attenuate electromagnetic (EM) waves. Herein, a novel series of high-entropy (V0.2Nb0.2Zr0.2Ta0.2X0.2)B2 (X=Mo, Ti, Hf) ceramics were successfully and rapidly synthesized using the ultrafast high-temperature sintering (UHS) method based on joule heating. The results indicated that effect component control magnetic loss system was relatively small, dielectric larger. Among them, HEB-Ti sample demonstrated superior absorbing properties, attributed its moderate optimal EM matching. At same time, because attenuation constant, it can achieve maximum penetration wave minimum reflection after wave. As result, (RLmin) as low –40.7 dB, effective absorption band covered entire frequency range from 2 8 GHz. Its excellent performance mainly due synergistic various mechanisms, including defect polarization, dipole conduction loss. Furthermore, thermogravimetric (TG) analysis showed exhibited stability could withstand up 550 °C air 1000 argon gas environment. relevant work provided meaningful references for design new high-performance ceramic wave-absorbing materials.
Язык: Английский
Процитировано
3
Nano-Micro Letters, Год журнала: 2025, Номер 17(1)
Опубликована: Фев. 25, 2025
Abstract Magnetic absorbers with high permeability have significant advantages in low-frequency and broadband electromagnetic wave (EMW) absorption. However, the insufficient magnetic loss inherent conductivity of existing limit further expansion EMW absorption bandwidth. Herein, spinel (FeCoNiCrCu) 3 O 4 high-entropy oxides (HEO) are successfully constructed on surface FeCoNiCr 0.4 Cu 0.2 alloys (HEA) through low-temperature oxygen bath treatment. On one hand, HEO HEA different magnetocrystalline anisotropies, which is conducive to achieving continuous natural resonance improve loss. other low can serve as an impedance matching layer, magneto-electric co-modulation. When thickness 5 mm, minimum reflection (RL) value bandwidth (RL < − dB) bi-phase composites (BPHEC) reach 12.8 dB 633 MHz, respectively. The RCS reduction multilayer sample gradient characteristic 18.34 m 2 . In addition, BPHEC also exhibits temperature-stable performance, Curie temperature, oxidation resistance. maintains between 593 691 MHz from 50 150 °C. This work offers a new tunable strategy toward modulating genes for ultra-broadband megahertz
Язык: Английский
Процитировано
3
Small, Год журнала: 2024, Номер unknown
Опубликована: Дек. 1, 2024
Abstract Anion doping engineering is recognized as a prospective strategy to adjust the electronic configuration and transport capacity of carbon‐based magnetoelectric hybrids optimize defects for modulation electromagnetic (EM) properties. This study effectively accomplishes an overwhelming enhancement in dielectric coupling between conduction polarization CuCo bimetallic/carbon system by employing situ (N, O)/ex (S, Se) defect strategies. The well‐designed lattice distortions are facilitated large atomic radii (Se) intercalated carbon skeleton bimetallic CuCo, which activate reinforcement dipole high‐frequency region. Interestingly, appropriate number vacancies acts “electron traps” accelerate local charge redistribution, endowing with extremely strong interactions interface‐induced polarization. It remarkable that ultra‐thin feature (1.8 mm) able achieve extraordinary microwave attenuation (‒56.1 dB). Additionally, specific upgrading anionic Se beneficially hinders development phonon transmission, conferring Cu 2 Se/CoSe /NC‐Se aerogel outstanding infrared stealth capabilities along inheriting advantages traditional (lightness, compressive/structural stability, hydrophobicity/anti‐corrosive properties). research offers distinctive perspectives on advanced design multifunctional absorbers complex environments.
Язык: Английский
Процитировано
16
Nano Energy, Год журнала: 2024, Номер unknown, С. 110528 - 110528
Опубликована: Ноя. 1, 2024
Язык: Английский
Процитировано
11
Advanced Functional Materials, Год журнала: 2025, Номер unknown
Опубликована: Фев. 13, 2025
Abstract The dielectric and magnetic coexistence behavior of high entropy oxides (HEOs) injects infinite dynamism in promoting electromagnetic wave (EMW) absorption, but precisely constructing their regular geometries at the nanoscale remains challenging. Herein, controlled preparation reduced graphite oxide loaded (CoFeNiCuMn)O with various by a rapid plasma process is reported. Modifying only metal content precursor can effectively influence morphology properties resulting derivatives, achieving well‐matched impedance ensuring outstanding absorption performance. results show that truncated octahedral HEO/RGO composite exhibits strongest absorbing capacity, minimum reflection loss −57 dB 14.1 GHz corresponding effective bandwidth covering 4.13 GHz. Moreover, constitutive relationship between multi‐element synergies microwave characteristics systematically explored, mechanism proposed. Delayed wireless charging time simulated values RCS less than −10 dBm 2 whole detection angles further demonstrate its dissipation capability practical application scenarios. This study not enriches variety lightweight efficient materials also guides for new configuration design HEOs.
Язык: Английский
Процитировано
2
Journal of Alloys and Compounds, Год журнала: 2025, Номер unknown, С. 180153 - 180153
Опубликована: Март 1, 2025
Язык: Английский
Процитировано
2
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 26, 2024
Abstract Special multilayer heterostructures and lattice modulation play a crucial role in the field of microwave absorption. Herein, unique “nested doll” MoS 2 /V O 3 are synthesized via crystal epitaxy growth solvothermal strategy. The synchronized spacing interfacial vacancies nanosheets is achieved by adjusting S ⁻ concentration. A high concentration expands increases vacancies, facilitating precise orderly arrangement ‐V ‐MoS layers inducing polarization. By increasing number V from two to five, built‐in electric formed, which enhances charge transfer surface core. introduction reduces band gap, lowers electron hopping barrier, dielectric loss, ultimately synergistically improves absorption (MA). As result, ‐5 (5 layers) microspheres exhibit superior MA behavior compared other absorbers. reflection loss reaches −69.65 dB effective bandwidth achieves 7.68 GHz. These discoveries have contributed further development improved advances theory energy structures electromagnetic properties.
Язык: Английский
Процитировано
7