Excellent Low‐Frequency Microwave Absorption and High Thermal Conductivity in Polydimethylsiloxane Composites Endowed by Hydrangea‐Like CoNi@BN Heterostructure Fillers

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(48)

Published: Oct. 9, 2024

Abstract The advancement of thin, lightweight, and high‐power electronic devices has increasingly exacerbated issues related to electromagnetic interference heat accumulation. To address these challenges, a spray‐drying‐sintering process is employed assemble chain‐like CoNi flake boron nitride (BN) into hydrangea‐like CoNi@BN heterostructure fillers. These fillers are then composited with polydimethylsiloxane (PDMS) develop CoNi@BN/PDMS composites, which integrate low‐frequency microwave absorption thermal conductivity. When the volume fraction 44 vol% mass ratio BN 3:1, composites exhibit optimal performance in both achieve minimum reflection loss −49.9 dB effective bandwidth 2.40 GHz (3.92–6.32 GHz) at thickness 4.4 mm, fully covering n79 band (4.4–5.0 for 5G communications. Meanwhile, in‐plane conductivity ( λ ∥ ) 7.31 W m −1 K , ≈11.4 times (0.64 pure PDMS, 32% higher than that (CoNi/BN)/PDMS (5.52 same obtained through direct mixing.

Language: Английский

---

Introducing Rich Heterojunction Surfaces to Enhance the High-Frequency Electromagnetic Attenuation Response of Flexible Fiber-Based Wearable Absorbers

Advanced Fiber Materials, Journal Year: 2024, Volume and Issue: 6(3), P. 739 - 757

Published: March 7, 2024

Language: Английский

---

Recent advances in construction strategies and multifunctional properties of flexible electromagnetic wave absorbing materials

Materials Research Bulletin, Journal Year: 2023, Volume and Issue: 171, P. 112630 - 112630

Published: Nov. 22, 2023

Language: Английский

---

Multiple Tin Compounds Modified Carbon Fibers to Construct Heterogeneous Interfaces for Corrosion Prevention and Electromagnetic Wave Absorption

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

Published: Sept. 27, 2024

Abstract Currently, the demand for electromagnetic wave (EMW) absorbing materials with specific functions and capable of withstanding harsh environments is becoming increasingly urgent. Multi-component interface engineering considered an effective means to achieve high-efficiency EMW absorption. However, modulation has not been fully discussed great potential in field In this study, multi-component tin compound fiber composites based on carbon (CF) substrate were prepared by electrospinning, hydrothermal synthesis, high-temperature thermal reduction. By utilizing different properties substances, rich heterogeneous interfaces are constructed. This effectively promotes charge transfer enhances interfacial polarization conduction loss. The SnS/SnS 2 /SnO /CF abundant have exhibit excellent absorption at a loading 50 wt% epoxy resin. minimum reflection loss (RL) − 46.74 dB maximum bandwidth 5.28 GHz. Moreover, composite coatings exhibited long-term corrosion resistance Q235 steel surfaces. Therefore, study provides strategy design complex environments.

Language: Английский

---

Optimizing Integrated‐Loss Capacities via Asymmetric Electronic Environments for Highly Efficient Electromagnetic Wave Absorption

Small, Journal Year: 2024, Volume and Issue: 20(43)

Published: July 2, 2024

Asymmetric electronic environments based on microscopic-scale perspective have injected infinite vitality in understanding the intrinsic mechanism of polarization loss for electromagnetic (EM) wave absorption, but still exists a significant challenge. Herein, Zn single-atoms (SAs), structural defects, and Co nanoclusters are simultaneously implanted into bimetallic metal-organic framework derivatives via two-step dual coordination-pyrolysis process. Theoretical simulations experimental results reveal that coupling interactions between SAs defects delocalize symmetric generate additional dipole without sacrificing conduction owing to compensation carbon nanotubes. Moreover, with large nanocurvatures induce strong interfacial electric field, activate superiority heterointerfaces promote polarization. Benefiting from aforementioned merits, resultant deliver an optimal reflection -58.9 dB effective absorption bandwidth is 5.2 GHz. These findings provide innovative insight clarifying microscopic asymmetric electron viewpoint inspire generalized modulation engineering optimizing EM absorption.

Language: Английский

---

Recent progress on carbon-based microwave absorption materials for multifunctional applications: A review

Composites Part B Engineering, Journal Year: 2024, Volume and Issue: 283, P. 111646 - 111646

Published: June 25, 2024

Language: Английский

---

Hierarchical porous carbon fibers for broadband and tunable high-performance microwave absorption

Materials Research Bulletin, Journal Year: 2023, Volume and Issue: 172, P. 112653 - 112653

Published: Dec. 16, 2023

Language: Английский

---

Controllable fiberization engineering of cobalt anchored mesoporous hollow carbon spheres for positive feedback to electromagnetic wave absorption

Carbon, Journal Year: 2024, Volume and Issue: 228, P. 119339 - 119339

Published: June 13, 2024

Language: Английский

---

Hollow tubular MnO2/MXene (Ti3C2, Nb2C, and V2C) composites as high-efficiency absorbers with synergistic anticorrosion performance

Carbon, Journal Year: 2023, Volume and Issue: 218, P. 118698 - 118698

Published: Nov. 29, 2023

Language: Английский

---

Low-Temperature Oxidation Induced Phase Evolution with Gradient Magnetic Heterointerfaces for Superior Electromagnetic Wave Absorption

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

Published: Sept. 22, 2024

Abstract Gradient magnetic heterointerfaces have injected infinite vitality in optimizing impedance matching, adjusting dielectric/magnetic resonance and promoting electromagnetic (EM) wave absorption, but still exist a significant challenging regulating local phase evolution. Herein, accordion-shaped Co/Co 3 O 4 @N-doped carbon nanosheets (Co/Co @NC) with gradient been fabricated via the cooperative high-temperature carbonization low-temperature oxidation process. The results indicate that surface epitaxial growth of crystal Co domains on nanoparticles realizes adjustment magnetic-heteroatomic components, which are beneficial for matching interfacial polarization. Moreover, simultaneously realize coupling, long-range diffraction. Specifically, synthesized @NC absorbents display strong attenuation capability − 53.5 dB at thickness 3.0 mm an effective absorption bandwidth 5.36 GHz, both superior to those single embedded matrix. This design concept provides us inspiration polarization, coupling absorption.

Language: Английский

---