Multi-carbon encapsulating soft-magnetic nanocomposite with environmentally adaptive wideband electromagnetic wave absorption
Multi-carbon encapsulating soft-magnetic nanocomposite with environmentally adaptive wideband electromagnetic wave absorption
复制标题
具有环境适应性宽带电磁波吸收的多碳封装软磁纳米复合材料
DOI：
10.1016/j.jallcom.2022.168216
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发表时间：
2023
影响因子：
6.2
通讯作者：
Zhidong Zhang
中科院分区：
文献类型：
--
作者：
Zixuan Lei;Yuxi Song;Mingze Li;Shuaizhen Li;Dianyu Geng;Wei Liu;Yu Cui;Haichang Jiang;Song Ma;Zhidong Zhang
高性能复合电磁微波吸收器要求具有良好的环境适应性，特别是在腐蚀性环境中。采用液相静电吸附法组装多层碳包覆FeNi （MCFN）磁性纳米胶囊作为防腐微波吸收剂。与先前报道的石墨包覆FeNi纳米胶囊的电磁吸收剂相比，聚乙烯醇（PVA）改性的纳米胶囊经过后续退火排列，由于阻抗匹配增强和电偶极子增加，从而实现了宽带电磁吸收增强，这与不同碳胶囊之间的多个界面有关。在厚度为2.9 mm时，在11.45 GHz处反射损耗最小（RL< - 63.26 dB）；在厚度为2.5 mm时，吸收带宽为6.57 GHz （RL< - 10 dB）。由于多层界面的氯离子捕获能力和双重耐蚀性的协同作用，MCFN微波吸收涂层具有长期耐蚀性。在NaCl溶液中浸泡30天后，MCFN涂层的|Z|0.01 hz值仍保持在4.53 × 104Ω的高耐蚀性。因此，多碳包封的软磁FeNi纳米颗粒在电磁波吸收和防腐方面具有优异的组合功能是本研究的新颖之处。
High-performance composite electromagnetic microwave (EM) absorbers are required to have good environmental adaptability, especially in corrosive environments. Multiple carbon coated FeNi (MCFN) magnetic nanocapsules assembled by liquid-phase electrostatic adsorption are presented as an anticorrosive microwave absorber. Compared to previously reported EM absorber of graphite coated FeNi nanocapsules, present nanocapsules modified by Polyvinyl alcohol (PVA) with subsequent annealed arrangement achieve the enhanced broadband EM absorption due to enhanced impedance matching and increased electric dipoles, which are related to the multiple interfaces between different carbon capsulations. The optimal 50 wt% MCFN filled in paraffin shows a minimum reflection loss (RL) − 63.26 dB at 11.45 GHz with a thickness of 2.9 mm and 6.57 GHz (RL<−10 dB) absorbing bandwidth with thickness of 2.5 mm. The MCFN microwave absorber coating exhibits long-term corrosion resistance due to the synergistic effect of the chloridion-capture capacity of the multi-layer interface and dual corrosion resistance. After soaking for 30 days NaCl solution, the |Z|0.01 Hzvalue of the MCFN coating remains at a high level corrosion resistance of 4.53 × 104Ω. Therefore, the novelty of present work is focus on the multi-carbon encapsulating soft magnetic FeNi nanoparticles which induce the excellent combined functions in electromagnetic wave absorption and anticorrosion.