Structural Defects in Phase‐Regulated High‐Entropy Oxides toward Superior Microwave Absorption Properties

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(1)

Published: Oct. 27, 2022

Abstract High‐entropy (HE) oxides have become increasingly popular as electromagnetic wave‐absorbing materials owing to their customizable structure and unique HE effects. However, the weak loss property of single‐phase ceramics approaches implemented improve them based on semi‐empirical rules severely limit development. Herein, two biphasic are prepared by simple sintering realize accurate regulation crystal phases structural defects. It is verified that effects cause various defects beneficial for microwave dissipation within complex‐phase ceramics. In spinel/perovskite oxides, around interface spinel (111) perovskite (110) planes, notable stress concentrations lattice distortions directly observed, inducing numerous point stacking faults. Interestingly, besides existing heterogeneous rock salt (220)/spinel (220) plane defects, salt/spinel enabled synergistic via precise components’ phase. Driven multi‐phases in complexes, intense polarization evidently found, confirmed first‐principles calculations. Accordingly, demonstrate excellent absorption performance, minimal reflection −54.5 dB achieved. Therefore, this study provides valuable guidelines design absorbers using oxides.

Language: Английский

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Phase Change Thermal Storage Materials for Interdisciplinary Applications

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(11), P. 6953 - 7024

Published: March 22, 2023

Functional phase change materials (PCMs) capable of reversibly storing and releasing tremendous thermal energy during the isothermal process have recently received attention in interdisciplinary applications. The smart integration PCMs with functional supporting enables multiple cutting-edge applications, including optical, electrical, magnetic, acoustic, medical, mechanical, catalytic disciplines etc. Herein, we systematically discuss storage mechanism, transfer conversion summarize state-of-the-art advances applications PCMs. In particular, are still their infancy. Simultaneously, in-depth insights into correlations between microscopic structures thermophysical properties composite revealed. Finally, current challenges future prospects also highlighted according to up-to-date This review aims arouse broad research interest community provide constructive references for exploring next generation advanced multifunctional thereby facilitating major breakthroughs both fundamental researches commercial

Language: Английский

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Flame-retardant and leakage-proof phase change composites based on MXene/polyimide aerogels toward solar thermal energy harvesting

Advanced Composites and Hybrid Materials, Journal Year: 2022, Volume and Issue: 5(2), P. 1253 - 1267

Published: June 1, 2022

Language: Английский

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Multifunctional Thermally Conductive Composite Films Based on Fungal Tree‐like Heterostructured Silver Nanowires@Boron Nitride Nanosheets and Aramid Nanofibers

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(5)

Published: Nov. 22, 2022

Thermal conduction for electronic equipment has grown in importance light of the burgeoning 5G communication. It is imperatively desired to design highly thermally conductive fillers and polymer composite films with prominent Joule heating characteristics extensive mechanical properties. In this work, "solvothermal & situ growth" method carried out prepare "Fungal tree"-like hetero-structured silver nanowires@boron nitride nanosheet (AgNWs@BNNS) fillers. The AgNWs@BNNS/ANF are obtained by "suction filtration self-assembly hot-pressing". When mass fraction AgNWs@BNNS 50 wt%, film presents optimal thermal conductivity coefficient 9.44 W/(m ⋅ K) excellent tensile strength 136.6 MPa, good temperature-voltage response characteristics, superior electrical stability reliability, which promise a wide application potential devices.

Language: Английский

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Layered Structural PBAT Composite Foams for Efficient Electromagnetic Interference Shielding

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 16(1)

Published: Nov. 23, 2023

The utilization of eco-friendly, lightweight, high-efficiency and high-absorbing electromagnetic interference (EMI) shielding composites is imperative in light the worldwide promotion sustainable manufacturing. In this work, magnetic poly (butyleneadipate-co-terephthalate) (PBAT) microspheres were firstly synthesized via phase separation method, then PBAT composite foams with layered structure was constructed through supercritical carbon dioxide foaming scraping techniques. merits integrating ferroferric oxide-loaded multi-walled nanotubes (Fe

Language: Английский

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Thermally conductive polyvinyl alcohol composite films via introducing hetero-structured MXene@silver fillers

Nano Research, Journal Year: 2023, Volume and Issue: 16(5), P. 7820 - 7828

Published: March 15, 2023

Language: Английский

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Self-Healing Liquid Metal Magnetic Hydrogels for Smart Feedback Sensors and High-Performance Electromagnetic Shielding

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: March 31, 2023

Hydrogels exhibit potential applications in smart wearable devices because of their exceptional sensitivity to various external stimuli. However, are limited by challenges terms issues biocompatibility, custom shape, and self-healing. Herein, a conductive, stretchable, adaptable, self-healing, biocompatible liquid metal GaInSn/Ni-based composite hydrogel is developed incorporating magnetic into the framework through crosslinking polyvinyl alcohol (PVA) with sodium tetraborate. The excellent stretchability fast self-healing capability PVA/liquid derived from its abundant hydrogen binding sites fusion. Significantly, owing constituent, can be guided remotely using an field specific position repair broken wires no need for manual operation. also exhibits sensitive deformation responses used as strain sensor monitor body motions. Additionally, multifunctional displays absorption-dominated electromagnetic interference (EMI) shielding properties. total performance increases ~ 62.5 dB 31.8 pure PVA at thickness 3.0 mm. proposed bioinspired demonstrates substantial application intelligent devices.

Language: Английский

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Wearable Janus‐Type Film with Integrated All‐Season Active/Passive Thermal Management, Thermal Camouflage, and Ultra‐High Electromagnetic Shielding Efficiency Tunable by Origami Process

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(18)

Published: Feb. 8, 2023

Abstract Multifunctional films with integrated temperature adjustment, electromagnetic interference (EMI) shielding, and thermal camouflage are remarkably desirable for wearable products. Herein, a novel Janus‐type multifunctional ultra‐flexible film is fabricated via continuous electrospinning followed by spraying. Interestingly, in the polyvinyl alcohol (PVA)/phase change capsules (PCC) layer (P 1 ), PCC strung on PVA fibers to form stable “candied haws stick” structure that obviates slipping or falling off. The sufficient melting enthalpy (141.4 J g −1 ) guarantees its thermoregulation capability. Simultaneously, high mid‐IR emissivity (90.15%) endows radiative cooling properties (reducing 10.13 °C). Mechanical strength significantly improved superimposing polylactic acid (PLA) 2 surface. By spraying thin MXene PLA surface of P film, obtained (MXene/P MP endowed satisfactory low‐voltage heating, photo‐thermal superior performance, achieving all‐season comfort. Impressively, flexible achieves enhanced EMI shielding effect from 50.3 87.8 dB through simple origami process, which simplifies manufacturing process high‐performance materials. In brief, an attractive candidate future products personalized management anti‐electromagnetic radiation.

Language: Английский

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Hyperelastic, Robust, Fire‐Safe Multifunctional MXene Aerogels with Unprecedented Electromagnetic Interference Shielding Efficiency

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(49)

Published: Sept. 5, 2023

Abstract MXene aerogels have shown great potential for many important functional applications, in particular electromagnetic interference (EMI) shielding. However, it has been a grand challenge to create mechanically hyperelastic, air‐stable, and durable enabling effective EMI protection at low concentrations due the difficulties achieving tailorable porous structures, excellent mechanical elasticity, desired antioxidation capabilities of air. Here, facile strategy fabricating composite by co‐assembling cellulose nanofibers during freeze‐drying followed surface encapsulation with fire‐retardant thermoplastic polyurethane (TPU) is reported. Because maximum utilization pore structures MXene, conductive loss enhanced multiple internal reflections, as‐prepared aerogel 3.14 wt% exhibits an exceptionally high shielding effectiveness 93.5 dB, ultra‐high efficiency 2977.71 dB g −1 , tripling values previous works. Owing presence hydrogen bonding TPU elastomer, hyperelastic feature additional strength, stability, superior durability, fire safety. This study provides creating multifunctional applications protection, wearable devices, thermal management, pressure sensing, intelligent monitoring.

Language: Английский

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"Three-in-One" Multi-Scale Structural Design of Carbon Fiber-Based Composites for Personal Electromagnetic Protection and Thermal Management

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: July 10, 2023

Wearable devices with efficient thermal management and electromagnetic interference (EMI) shielding are highly desirable for improving human comfort safety. Herein, a multifunctional wearable carbon fibers (CF) @ polyaniline (PANI) / silver nanowires (Ag NWs) composites "branch-trunk" interlocked micro/nanostructure were achieved through "three-in-one" multi-scale design. The reasonable assembly of the three kinds one-dimensional (1D) materials can fully exert their excellent properties i.e., superior flexibility CF, robustness PANI, splendid conductivity AgNWs. Consequently, constructed flexible composite demonstrates enhanced mechanical tensile stress 1.2 MPa, which was almost 6 times that original material. This is mainly attributed to fact PNAI (branch) firmly attached CF (trunk) polydopamine (PDA), forming robust structure. Meanwhile, possesses insulation heat preservation capacity owing synergistically low emissivity. More importantly, conductive path established by 1D greatly improved its EMI property Joule heating performance at applied voltage. work paves way rational utilization intrinsic materials, as well provides promising strategy designing protection energy devices.

Language: Английский

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