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| 1 | Advances in core–shell engineering of carbon-based composites for electromagnetic wave absorption显示文摘Electromagnetic(EM)absorption is paving the way to overcome the challenges related to conventional shielding strategy against EM pollution through sustainable energy dissipation.As characteristic functional media that can interact with electric or magnetic field branch,EM wave absorption materials(EWAMs)have received extensive attention and realized considerable development in the past two decades,where carbon-based composites are always considered as promising candidates for high-performance EMAWs due to their synergetic loss mechanism as well as diversified composition and microstructure design.Recent progress indicates that there is more and more interest in the fabrication of carbon-based composites with unique core–shell configuration.On one hand,core–shell configuration usually ensures good chemical homogeneity of final products and provides some positive protections for the components with susceptibility to corrosion,on the other hand,it creates enough heterogeneous interfaces between different EM components,which may bring enhanced polarization effect and intensify the consumption of EM energy.In this review,we firstly introduce EM wave absorption theory,and then highlight the advances of core–shell engineering in carbonbased composites in terms of built-in carbon cores and built-out carbon shells.Moreover,we also show some special core–shell carbon-based composites,including carbon/carbon composites,assembled composites,and decorated composites.After analyzing EM absorption performance of some representative composites,we further propose some challenges and perspectives on the development of core–shell carbon-based composites. | Lixue Gai Honghong Zhao Fengyuan Wang Pan Wang Yonglei Liu Xijiang Han Yunchen Du | 2022 | Nano Research2022，15，10： | 5 |
| 2 | 壳核结构SiC/C纤维的制备与吸波性能的研究显示文摘采用活性碳纤维转换法制备了壳核结构SiC/C纤维,采用拉曼光谱、SEM、XRD以及热重分析等测试方法对比研究了生成SiC的厚度对壳核结构SiC/C纤维样品的热重及吸波性能的影响。结果表明:包裹SiC壳层后样品吸波性能得到提高,样品厚度为3.0 mm时,保温4 h样品的最小反射损耗在8.24 GHz处达到-17.22 dB,低于-10 dB(90%的电磁波被吸收)的频宽在2.0 mm处达到4.8 GHz(11.12~15.92 GHz);保温3 h样品的最小反射损耗在8.23 GHz处达到-14.45 dB,低于-10 dB(90%的电磁波被吸收)的频宽在2.0 mm处达到4.56 GHz(10.88~15.44 GHz);且随着SiC含量的升高,试样微波吸收性能有所增强;制备的壳核结构SiC/C纤维样品起始氧化温度提高了150℃以上,并且最终残余质量在50%左右,即包裹SiC纤维后样品的抗氧化能力大大提高。 | 王坤 张涛 王建 夏龙 | 2021 | 硅酸盐通报2021，40，4： | 1 |
| 3 | Influence of High-Pressure Nitrogenation on the Structure,Magnetism and Microwave Absorption Properties of SmFe_(10)Mo_2显示文摘Nitrogenation of Sm Fe10Mo2 powders was performed in a self-made furnace under a high-purity N2 atmosphere up to 40 MPa at 500 °C. Upon nitrogenation at atmospheric pressure, the lattice parameters a and c increase by0.5% and 2.7%, respectively, whereas the Curie temperature TCincreases from 519 to 633 K. With further increasing the nitrogenation pressure to 20 and 40 MPa, the 1:12 main phase starts to decompose and a large amount of Mo and a-Fe precipitates. This leads to variation of Mo concentration in the 1:12 phase and causes a sharp decrease in TCand in the coercivity. The relative complex permittivity and permeability of paraffin–Sm Fe10Mo2 composites show multi-resonant behavior. After nitrogenation, the magnetic loss of the powders decreases, which may originate from the influence of eddy currents due to the increase in the particle size. | Nai-Kun Sun Jie Guo Sheng-Jie Du Song-Ning Xu Ping-Zhan Si Jin-Jun Liu | 2015 | Acta Metallurgica Sinica(English Letters)2015，28，6： | 1 |
| 4 | 退火对Ni/TiO_2纳米复合材料吸波性能的影响显示文摘采用机械化学法制备了Ni/TiO2纳米复合材料,制备态样品由六角形结构的金红石TiO2和面心立方结构的Ni组成。退火使样品晶格缺陷和内应力减少,Ni晶粒尺寸和饱和磁化强度明显增大。退火后,TiO2的本征发光峰、自由激子及束缚激子引起的发光峰都发生红移,其原因是能带结构的畸变。制备态样品在15 GHz产生强烈的非线性介电共振,并呈现明显的Cole-Cole半圆。当吸收厚度为8 mm时,在14-16 GHz范围内的反射损耗值(RL)都超过了-10 dB,且在15 GHz处出现最优RL值-32 dB。退火使制备态样品在2.8和5.2 GHz处的自然共振明显加强,2-6 GHz范围的吸波能显著提高。 | 孙乃坤 杜胜杰 杜宝盛 柳峰 赵美星 | 2014 | 材料研究学报2014，28，4： | 0 |
| 5 | 双损耗Al_(2)O_(3)基多孔吸波材料的制备及其吸波性能显示文摘基于片状Al_(2)O_(3)陶瓷互锁结构强度高的特点,制备出夹杂石墨的高气孔率的Al_(2)O_(3)多孔陶瓷,并通过原位还原在多孔骨架中制备出Ni微粒,形成一种轻质的双损耗陶瓷基吸波材料。通过XRD、FE-SEM和EDS研究了还原温度对多孔吸波材料的组成、微观形貌、元素分布和吸波性能的影响。结果表明,还原温度升温至700℃可将多孔网络中Ni完全还原,形成以堆叠互锁Al_(2)O_(3)为基,夹杂片状石墨和孔表面覆盖Ni微粒的双损耗轻质吸波材料。当复合材料厚度为6.5 mm时,最小反射损耗为-35.01 dB,有效吸收带宽达到1.75 GHz。片状Al_(2)O_(3)锁定的石墨片构筑的导电网络,Ni微粒与基体之间的极化效应等共同促进复合材料良好的微波吸收性能。 | 乔宇燨 李红伟 张利琪 吉雪丽 周亮 | 2023 | 宇航材料工艺2023，53，5： | 0 |
| 6 | Template-free preparation of porous Co microfibers from spent lithium-ion batteries as a promising microwave absorber显示文摘In order to take full advantage of the secondary resources,in this paper,we reported a template-free process to prepare porous Co microfibers from spent lithiumion batteries(LIBs).First,the waste LiCoO_(2) powders were leached by oxalic acid at a suitable temperature,and rodlike cobalt oxalate powders were obtained.Second,the porous Co microfibers were prepared by using the cobalt oxalate as precursors through a thermal decomposition at420 ℃ under nitrogen atmosphere.The prepared Co microfibers possess diameters of 1-2 μm,and each microfiber consists of small particles with size of100-200 nm.The Co microfibers(25 wt%)/paraffin composite exhibited excellent microwave absorption performance.When the sample thickness is 4.5 mm,the reflection losses reach-36.14 and-38.20 dB at 4.16 and 17.60 GHz,respectively,and the effective bandwidth reaches up to 5.52 GHz.This indicates that the Co microfibers can be used as a promising microwave absorber.Therefore,this paper demonstrates a novel process to make a high value-added product through recycling from the spent lithium-ion batteries.In addition,it is advantageous to eliminate the hazard of spent lithium-ion batteries and electromagnetic radiation to environment and human health. | Xiao-Min Wu Fei Xie Yong-Lin Yao Yue Sun Zhong-Sheng Hua Zhuo Zhao Yong-Xiang Yang | 2022 | Rare Metals2022，41，10： | 0 |
| 7 | Ni/TiO_2纳米复合材料的微结构、发光与吸波性能显示文摘采用机械化学法制备了 Ni/TiO2纳米复合材料,并对制备态样品在100和200℃退火30 min.样品均由六角形结构的金红石 TiO2和面心立方结构的Ni组成.随着退火温度的增加,Ni 和 TiO2的晶粒尺寸都有所增加,与此同时内应力释放使矫顽力减少.退火使TiO2的本征发光峰、自由激子、束缚激子和氧缺陷引起的发光峰都发生蓝移,这被归结为能带结构的畸变.100℃退火样品呈现多重非线性介电共振和强烈的自然共振现象,当样品厚度为1.9 mm 时,在17.5 GHz 处最佳反射损耗(RL)值为-29.6 dB,且在此厚度下,超过-10 dB 的频宽几乎覆盖了 Ku 波段(12.4-18 GHz);另外,厚度在8-10 mm 范围内,超过-10 dB 的频宽几乎覆盖了整个 X 波段(8-12 GHz).该体系优异的电磁波吸收性能来自于样品中的多重非线性介电共振、自然共振和良好的电磁匹配. | 胡杰 杜宝盛 柳峰 杜胜杰 赵美星 孙乃坤 | 2014 | 功能材料2014，45，B06： | 0 |
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