Chemical Engineering Journal, Год журнала: 2021, Номер 427, С. 131540 - 131540
Опубликована: Авг. 10, 2021
Язык: Английский
Nano-Micro Letters, Год журнала: 2021, Номер 13(1)
Опубликована: Март 16, 2021
Abstract In order to ensure the operational reliability and information security of sophisticated electronic components protect human health, efficient electromagnetic interference (EMI) shielding materials are required attenuate wave energy. this work, cellulose solution is obtained by dissolving cotton through hydrogen bond driving self-assembly using sodium hydroxide (NaOH)/urea solution, aerogels (CA) prepared gelation freeze-drying. Then, carbon aerogel@reduced graphene oxide (CCA@rGO) vacuum impregnation, freeze-drying followed thermal annealing, finally, CCA@rGO/polydimethylsiloxane (PDMS) EMI composites backfilling with PDMS. Owing skin-core structure CCA@rGO, complete three-dimensional (3D) double-layer conductive network can be successfully constructed. When loading CCA@rGO 3.05 wt%, CCA@rGO/PDMS have an excellent effectiveness (EMI SE) 51 dB, which 3.9 times higher than that co-blended CCA/rGO/PDMS (13 dB) same fillers. At time, stability ( T HRI 178.3 °C) good conductivity coefficient λ 0.65 W m -1 K ). Excellent comprehensive performance makes great prospect for applications in lightweight, flexible composites. Graphic abstract
Язык: Английский
Процитировано
600
Advanced Materials, Год журнала: 2023, Номер 35(16)
Опубликована: Янв. 27, 2023
Flexible multifunctional polymer-based electromagnetic interference (EMI) shielding composite films have important applications in the fields of 5G communication technology, wearable electronic devices, and artificial intelligence. Based on design a porous/multilayered structure using polyimide (PI) as matrix polymethyl methacrylate (PMMA) microspheres template, flexible (Fe3 O4 /PI)-Ti3 C2 Tx -(Fe3 /PI) with controllable pore sizes distribution Ti3 hollow are successfully prepared by sacrificial template method. Owing to structure, when size is 10 µm mass ratio PMMA/Ti3 2:1, film has most excellent EMI performance, effectiveness (EMI SE) 85 dB. It further verified finite element simulation that an effect waves. In addition, good thermal conductivity (thermal coefficient 3.49 W (m·K)-1 ) mechanical properties (tensile strength 65.3 MPa). This conductivity, demonstrated great potential for protection high-power, portable, devices.
Язык: Английский
Процитировано
524
Nano-Micro Letters, Год журнала: 2021, Номер 13(1)
Опубликована: Авг. 18, 2021
Abstract With the widespread application of electronic communication technology, resulting electromagnetic radiation pollution has been significantly increased. Metal matrix interference (EMI) shielding materials have disadvantages such as high density, easy corrosion, difficult processing and price, etc. Polymer EMI composites possess light weight, corrosion resistance processing. However, current polymer present relatively low electrical conductivity poor performance. This review firstly discusses key concept, loss mechanism test method shielding. Then development status is summarized, research progress with different structures illustrated, especially for their preparation methods evaluation. Finally, corresponding scientific technical problems are proposed, trend also prospected. "Image missing"
Язык: Английский
Процитировано
475
Nano-Micro Letters, Год журнала: 2021, Номер 13(1)
Опубликована: Апрель 5, 2021
Highlights The eco-friendly shaddock peel-derived carbon aerogels were prepared by a freeze-drying method. Multiple functions such as thermal insulation, compression resistance and microwave absorption can be integrated into one material-carbon aerogel. Novel computer simulation technology strategy was selected to simulate significant radar cross-sectional reduction values under real far field condition. . Abstract Eco-friendly electromagnetic wave absorbing materials with excellent infrared stealth property, heat-insulating ability are highly attractive in practical applications. Meeting the aforesaid requirements simultaneously is formidable challenge. Herein, ultra-light fabricated via fresh peel facile method calcination process, forming porous network architecture. With heating platform temperature of 70 °C, upper surface temperatures as-prepared aerogel present slow upward trend. color sample images similar that surroundings. maximum compressive stress 2.435 kPa, provide favorable endurance. peel-based possess minimum reflection loss value ( RL min ) − 29.50 dB X band. Meanwhile, effective bandwidth covers 5.80 GHz at relatively thin thickness only 1.7 mm. detection theta 0°, (RCS) 16.28 m 2 achieved. Theoretical simulations RCS have aroused extensive interest owing their ingenious design time-saving feature. This work paves way for preparing multi-functional absorbers derived from biomass raw guidance simulations.
Язык: Английский
Процитировано
448
Small, Год журнала: 2021, Номер 17(42)
Опубликована: Сен. 14, 2021
With the rapid development and popularization of smart, portable, wearable flexible electronic devices, urgent demands have been raised for electromagnetic interference (EMI) shielding films to solve related pollution problems. polyvinyl alcohol (PVA) as polymer matrix, sandwich-structured EMI nanocomposite are prepared via electrospinning-laying-hot pressing technology, where Fe3 O4 /PVA composite electrospun nanofibers in top bottom layers Ti3 C2 Tx middle layer. Owing electrospinning process successful construction sandwich structure, when amounts respectively only 13.3 26.7 wt%, effectiveness (EMI SE) reach 40 dB with thickness 75 µm, higher than that (Fe3 /Ti3 )/PVA (21 dB) based on blending-electrospinning-hot under same fillers. Furthermore, possess excellent thermal conductivities mechanical properties. This novel kind performances, conductivities, properties presents broad application prospects fields protection high-power, devices.
Язык: Английский
Процитировано
442
Nano-Micro Letters, Год журнала: 2021, Номер 14(1)
Опубликована: Дек. 4, 2021
Abstract Although advances in wireless technologies such as miniature and wearable electronics have improved the quality of our lives, ubiquitous use comes at expense increased exposure to electromagnetic (EM) radiation. Up date, extensive efforts been made develop high-performance EM absorbers based on synthetic materials. However, design an absorber with both exceptional dissipation ability good environmental adaptability remains a substantial challenge. Here, we report class carbon heterostructures via hierarchical assembly graphitized lignocellulose derived from bamboo. Specifically, assemblies nanofibers nanosheets behave nanometer-sized antenna, which results enhancement conductive loss. In addition, show that composition cellulose lignin precursor significantly influences shape formation covalent bonds, affect dielectric response-ability surface hydrophobicity (the apparent contact angle water can reach 135°). Finally, demonstrate obtained heterostructure maintains its wideband absorption effective frequency ranging 12.5 16.7 GHz under conditions simulate real-world environment, including rainwater slightly acidic/alkaline pH values. Overall, reported this work provide new principles for synthesis find practical applications environments.
Язык: Английский
Процитировано
248
Nano-Micro Letters, Год журнала: 2022, Номер 14(1)
Опубликована: Янв. 27, 2022
With the rapid development of fifth-generation mobile communication technology and wearable electronic devices, electromagnetic interference radiation pollution caused by waves have attracted worldwide attention. Therefore, design highly efficient EMI shielding materials are great importance. In this work, three-dimensional graphene oxide (GO) with regular honeycomb structure (GH) is firstly constructed sacrificial template freeze-drying methods. Then, amino functionalized FeNi alloy particles (f-FeNi) loaded on GH skeleton followed in-situ reduction to prepare rGH@FeNi aerogel. Finally, rGH@FeNi/epoxy composites obtained vacuum-assisted impregnation epoxy resin. Benefitting from construction synergistic effect, a low mass fraction 2.1 wt% (rGH f-FeNi 1.2 0.9 wt%, respectively) exhibit high effectiveness (EMI SE) 46 dB, which 5.8 times that (8 dB) for rGO/FeNi/epoxy same rGO/FeNi fraction. At time, also possess excellent thermal stability (heat-resistance index temperature at maximum decomposition rate 179.1 389.0 °C mechanical properties (storage modulus 8296.2 MPa).
Язык: Английский
Процитировано
232
Nano-Micro Letters, Год журнала: 2022, Номер 14(1)
Опубликована: Апрель 1, 2022
The rapid development of aerospace weapons and equipment, wireless base stations 5G communication technologies has put forward newer higher requirements for the comprehensive performances polymer-based electromagnetic interference (EMI) shielding composites. However, most currently prepared EMI composites are still difficult to combine high performance multi-functionality. In response this, based on research works relevant researchers as well our group, three possible directions break through above bottlenecks proposed, including construction efficient conductive networks, optimization multi-interfaces lightweight multifunction compatibility design. future trends in prospected, it is hoped provide certain theoretical basis technical guidance preparation,
Язык: Английский
Процитировано
221
Chemical Engineering Journal, Год журнала: 2021, Номер 419, С. 130050 - 130050
Опубликована: Апрель 28, 2021
Язык: Английский
Процитировано
219
Advanced Composites and Hybrid Materials, Год журнала: 2022, Номер 5(2), С. 1253 - 1267
Опубликована: Июнь 1, 2022
Язык: Английский
Процитировано
218