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

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Consistent Thermal Conductivities of Spring‐Like Structured Polydimethylsiloxane Composites under Large Deformation

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 6, 2024

Flexible and highly thermally conductive materials with consistent thermal conductivity (λ) during large deformation are urgently required to address the heat accumulation in flexible electronics. In this study, spring-like conduction pathways of silver nanowire (S-AgNW) fabricated by 3D printing compounded polydimethylsiloxane (PDMS) prepare S-AgNW/PDMS composites excellent λ deformation. The exhibit a 7.63 W m

Language: Английский

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Phase change composite based on lignin carbon aerogel/nickel foam dual-network for multisource energy harvesting and superb EMI shielding

International Journal of Biological Macromolecules, Journal Year: 2024, Volume and Issue: 277, P. 134233 - 134233

Published: July 28, 2024

Language: Английский

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Robust Solid–Solid Phase Change Coating Encapsulated Glass Fiber Fabric with Electromagnetic Interference Shielding for Thermal Management and Message Encryption

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Abstract Electromagnetic interference (EMI) shielding composites with both thermal response/management functions and message transfer/encryption behavior are ideal for use in fields such as aerospace, construction engineering, military equipment. In this work, a self‐cross‐linking supramolecular solid–solid phase change polyethylene glycol (ScPEG) coating is prepared based on multiple hydrogen bonds, which used encapsulating glass fiber fabric (GFF) modified silver nanowires (AgNWs). The obtained through the hydrolysis‐condensation of PEG reactive silanol end group. Polyethylene molecular chains can store release heat by switching between crystalline amorphous state. groups form networks physical cross‐linking resulting an excellent stability. particular, bonds ScPEG AgNW‐modified GFF (A‐GFF) enhance interfacial interactions, robust structure enables efficient stress transfer. ScPEG‐coated A‐GFF achieve tensile strength up to 191 MPa tunable EMI effectiveness (SE) 40 72 dB depending number layers. Moreover, exhibits flexible response characteristic, outstanding management capability, potential encryption behavior.

Language: Английский

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Rational construction of ZnFe2O4 decorated hollow carbon cloth towards effective electromagnetic wave absorption

Ceramics International, Journal Year: 2024, Volume and Issue: 50(13), P. 24549 - 24557

Published: April 22, 2024

Language: Английский

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Asymmetric Structural MXene/PBO Aerogels for High‐Performance Electromagnetic Interference Shielding with Ultra‐Low Reflection

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 4, 2024

Abstract Electromagnetic interference (EMI) shielding materials with low electromagnetic (EM) waves reflection characteristics are ideal for blocking EM radiation and pollution. Materials reflectivity must be constructed using excellent absorption properties. However, simultaneously possessing both EMI performance remain scarce, consequently, multilayer structures need to developed. Poly(p‐phenylene–2,6–benzobisoxazole) nanofibers (PNF) prepared by deprotonation. PNF combined MXene heterostructure MXene@Ni in‐situ growth; MXene@Ni/PNF acts as an layer while MXene/PNF reflective layer. Finally, (MXene@Ni/PNF)–(MXene/PNF) aerogels layer‐by‐layer freeze‐drying based on the layered modular design concept. Experimental characterizations revealed that enable efficient absorption‐reflection‐reabsorption of waves, effectively eliminating EMI. When mass ratio Ni in is 1:6 fraction 80 wt.%, exhibit (71 dB) a very coefficient (R = 0.10). Finite element simulations verified developed asymmetric structural achieve high characteristics. In addition, display infrared camouflage ability.

Language: Английский

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Zeolite imidazolate framework derived efficient absorbers: from morphology modulation to component regulation

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1010, P. 177092 - 177092

Published: Oct. 16, 2024

Language: Английский

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Triple-network structured phase change composite based on “rod-brush” CNTs-CFs with high thermal conductivity

Composites Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 111080 - 111080

Published: Jan. 1, 2025

Language: Английский

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MoS2 Lubricate-Toughened MXene/ANF Composites for Multifunctional Electromagnetic Interference Shielding

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

Published: Oct. 11, 2024

Abstract The design and fabrication of high toughness electromagnetic interference (EMI) shielding composite films with diminished reflection are an imperative task to solve pollution problem. Ternary MXene/ANF (aramid nanofibers)–MoS 2 nacre-like layered structure here fabricated after the introduction MoS into binary system. fulfills impressive “kill three birds one stone” improvement effect: lubrication toughening mechanical performance, reduction in secondary wave, performance photothermal conversion. After (mass ratio 50:50), strain failure tensile strength increase from 22.1 $$\pm$$ ± 1.7% 105.7 6.4 MPa 25.8 0.7% 167.3 9.1 MPa, respectively. elevates 13.0 4.1 26.3 0.8 MJ m −3 (~ 102.3%) simultaneously. And effectiveness (SE R ) 50:50) decreases ~ 10.8%. EMI (EMI SE) 41.0 dB (8.2–12.4 GHz); 60:40), increases 18.3 1.9% 28.1 53.5%), SE 22.2%, corresponding is 43.9 dB. also leads a more efficient conversion 45 55 °C). Additionally, MXene/ANF–MoS exhibit excellent electric heating quick temperature elevation (15 s), cycle stability (2, 2.5, 3 V), long-term (2520 s). Combining MXene content, ternary could be applied many industrial areas. This work broadens how achieve balance between properties versatility composites case high-function fillers.

Language: Английский

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Highly Thermally Conductive Liquid Crystalline Epoxy Resin Vitrimers with Reconfigurable, Shape‐Memory, Photo‐Thermal, and Closed‐Loop Recycling Performance

Advanced Science, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 22, 2024

Abstract The low thermal conductivity, poor toughness, and non‐reprocessability of thermosetting epoxy resins severely restrict their applications sustainable development in flexible electronics. Herein, liquid crystalline (LCE) dynamic ester disulfide bonds are introduced into the cured network bisphenol A resin (E‐51) to construct highly thermally conductive (LCER) vitrimers. LCER vitrimers demonstrate adjustable mechanical properties by varying ratio LCE E‐51, allowing it transition from soft strong. Typically, a 75 mol% 25 E‐51 results an in‐plane conductivity ( λ ) 1.27 W m −1 K , over double that pure vitrimer (0.61 ). tensile strength toughness increase 2.88 folds 14.1 MPa 2.45 20.1 MJ −3 respectively. Besides, phase covalent enable triple shape memory three‐dimensional reconstruction. After four reprocessing cycles, remain at 94% 72%, Integrating carbon nanotubes (CNTs) imparts photo‐thermal effect enables “on” “off” switch under near‐infrared light vitrimer. Furthermore, CNTs/LCER displays light‐induced actuation, self‐repairing, self‐welding besides closed‐loop recycling rapid degradation performance.

Language: Английский

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