The Experts below are selected from a list of 138483 Experts worldwide ranked by ideXlab platform
Yakov Z Slutsker - One of the best experts on this subject based on the ideXlab platform.
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total absorption of an Electromagnetic Wave by an overdense plasma
Physical Review Letters, 2005Co-Authors: Yury P Bliokh, J Felsteiner, Yakov Z SlutskerAbstract:We show both theoretically and experimentally that an Electromagnetic Wave can be totally absorbed by an overdense plasma when a subWavelength diffraction grating is placed in front of the plasma surface. The absorption is due to dissipation of surface plasma Waves (plasmons polaritons) that have been resonantly excited by the evanescent component of the diffracted Electromagnetic Wave. The developed theoretical model allows one to determine the conditions for the total absorption.
Jianping He - One of the best experts on this subject based on the ideXlab platform.
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graphene carbonyl iron cross linked composites with excellent Electromagnetic Wave absorption properties
Journal of Materials Chemistry C, 2014Co-Authors: Jianping HeAbstract:Graphene is a highly desirable material for efficient Electromagnetic Wave absorption due to its strong dielectric loss and low density. However, the main drawbacks in pristine graphene, such as high dielectric constant and low permeability, inevitably limit its performance due to the poor impedance matching. In this paper, reduced graphene oxide–spherical carbonyl iron composites (RGO–SCI) have been successfully fabricated through a facile wet chemical method. As expected, an apparent improvement of impedance matching in Electromagnetic Wave absorption could be found through the combination of RGO and SCI. A carbon-bridge effect was adopted to explain the Electromagnetic Wave absorbing process, which is closely related to a cross-linked framework structure of as-synthesized composites. Besides, in the range of 7.79–11.98 GHz with the thickness of 3.0 mm, the RGO–SCI composites exhibited efficient Electromagnetic Wave absorption characteristics (RL < 10 dB) with a minimum reflection loss of −52.46 dB.
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laminated magnetic graphene with enhanced Electromagnetic Wave absorption properties
Journal of Materials Chemistry C, 2013Co-Authors: Xin Sun, Jianping He, Guoxian Li, Jing Tang, Tao Wang, Yunxia Guo, Hairong XueAbstract:Graphene is highly desirable as an Electromagnetic Wave absorber because of its high dielectric loss and low density. Nevertheless, pure graphene is found to be non-magnetic and contributes to microWave energy absorption mostly because of its dielectric loss, and the Electromagnetic parameters of pure graphene, which are out of balance, result in a bad impedance matching characteristic. In this paper, we report a facile solvothermal route to synthesize laminated magnetic graphene. The results show that there have been significant changes in the Electromagnetic properties of magnetic graphene when compared with pure graphene. Especially the dielectric Cole–Cole semicircle suggests that there are Debye relaxation processes in the laminated magnetic graphene, which prove beneficial to enhance the dielectric loss. We also proposed an Electromagnetic complementary theory to explain how laminated magnetic graphene, with the combined advantages of graphene and magnetic particles, helps to improve the standard of impedance matching for Electromagnetic Wave absorbing materials. Besides, microWave absorption properties indicate that the reflection loss of the as-prepared composite is below −10 dB (90% absorption) at 10.4–13.2 GHz with a coating layer thickness of 2.0 mm. This further confirms that the nanoscale surface modification of magnetic particles on graphene makes graphene-based composites have a certain research value in Electromagnetic Wave absorption.
Sheng Zhang - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic Wave Absorption Coating Material with Self-Healing Properties
Macromolecular Rapid Communications, 2017Co-Authors: Ya-min Wang, Xiang Yong Liang, Min Pan, Bang-jing Li, Sheng ZhangAbstract:© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Electromagnetic Wave absorption coatings can effectively minimize Electromagnetic radiation and are widely used in the military and civil field. However, even small scratches on the coating can lead to a large decline of absorption ability and bring serious consequences. To enhance the lifetime of Electromagnetic Wave absorbing coating, a kind of self-healing Electromagnetic Wave absorbing coating is developed by introducing host-guest interactions between the absorbing fillers and polymer matrix. After being damaged, the cracks on this coating can be healed completely with the aid of small amounts of water. Simultaneously, the Electromagnetic absorbing ability of the coating is restored along with the self-healing process.
Chao Wang - One of the best experts on this subject based on the ideXlab platform.
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overview of carbon nanostructures and nanocomposites for Electromagnetic Wave shielding
Carbon, 2018Co-Authors: Chao Wang, Vignesh Murugadoss, Jie Kong, Zhenfeng He, Qian Shao, Yanjun Chen, Subramania AngaiahAbstract:Abstract Based on the contributions of carbon nanostructures and their composited species, great advances in Electromagnetic Wave interference shielding have been achieved. In this article, recent progress in Electromagnetic Wave shielding enabled by the synergism of carbon nanostructures and their corresponding composites is discussed encompassing the factors of microstructural defects, filler concentration, filler alignment, filler inherent conductivity and the surrounding temperature. Carbon nanostructures and their composites would energize the advanced Electromagnetic Wave shielding because of their light weight, high corrosion resistance, excellent thermal, mechanical, and electrical properties, broad absorption frequency bandwidth and cost-effectiveness. In this context of identifying suitable carbon composites that can enhance Electromagnetic Wave absorption. This review provides updated Electromagnetic Wave shielding knowledge of carbon nanostructures and their composites as well as their prospects and challenges.
Tiehu Li - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic Wave absorbing properties of amorphous carbon nanotubes
Scientific Reports, 2015Co-Authors: Tingkai Zhao, Hongyan Zhang, Jungao Wang, Tiehu LiAbstract:Amorphous carbon nanotubes (ACNTs) with diameters in the range of 7–50 nm were used as absorber materials for Electromagnetic Waves. The Electromagnetic Wave absorbing composite films were prepared by a dip-coating method using a uniform mixture of rare earth lanthanum nitrate doped ACNTs and polyvinyl chloride (PVC). The microstructures of ACNTs and ACNT/PVC composites were characterized using transmission electron microscope and X-ray diffraction and their Electromagnetic Wave absorbing properties were measured using a vector-network analyzer. The experimental results indicated that the Electromagnetic Wave absorbing properties of ACNTs are superior to multi-walled CNTs and greatly improved by doping 6 wt% lanthanum nitrate. The reflection loss (R) value of a lanthanum nitrate doped ACNT/PVC composite was −25.02 dB at 14.44 GHz and the frequency bandwidth corresponding to the reflector loss at −10 dB was up to 5.8 GHz within the frequency range of 2–18 GHz.