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Lightweight and Construable Magnetic Wood for Electromagnetic Interference Shielding
Advanced Engineering Materials ( IF 3.6 ) Pub Date : 2020-06-05 , DOI: 10.1002/adem.202000257
Zheng Cheng 1 , Yuyi Wei 2 , Chao Liu 1 , Yong Chen 1 , Yi Ma 1 , Huaihao Chen 2 , Xianfeng Liang 2 , Nian X. Sun 2 , Hongli Zhu 1
Affiliation  

Currently, due to the rapid development of communication technology, electromagnetic interference (EMI) and irradiation have become an emerging environmental pollutant. Herein, hierarchical and porous structured wood is used as the lightweight three‐dimensional organic scaffold for the incorporation of magnetic iron oxide nanoparticles through an in situ mineralization process that endows the woodblock with favorable appearance as well as magnetic and EMI shielding properties. The two‐step process involves the removal of lignin from natural wood via cooking and bleaching followed by inorganic mineralization. The resultant magnetic wood displays an optical brown appearance and possesses a typical magnetic hysteresis behavior with a saturation magnetization of 4.5 emu g−1 for the whole wood. More importantly, the obtained magnetic wood is much lighter than traditional magnetic metal and construable for versatile applications. Notably, the 3 mm thick magnetic wood shows 5–10 dB (or 7–10×) enhanced electromagnetic wave attenuation across the X‐band of 8–12 GHz compared with nonmagnetic wood with the same thickness. The enhanced electromagnetic wave absorption of magnetic wood is mainly due to its enhanced magnetic loss tangent compared with nonmagnetic wood. This work provides an inspiring strategy to develop sustainable, lightweight, and environmentally friendly wood for multifunctional magnetic applications.

中文翻译:

用于电磁干扰屏蔽的轻质可伸缩磁性木

当前,由于通信技术的飞速发展,电磁干扰(EMI)和辐射已成为新兴的环境污染物。在这里,分层多孔的木材被用作轻型三维有机支架,通过原位矿化过程掺入磁性氧化铁纳米颗粒,赋予木块良好的外观以及磁性和EMI屏蔽性能。分两步进行,涉及通过烹饪和漂白从天然木材中去除木质素,然后进行无机矿化。所得的磁性木材表现出光学棕色外观,并具有典型的磁滞特性,饱和磁化强度为4.5 emu g -1对于整个木头。更重要的是,所获得的磁性木材比传统的磁性金属轻得多,并且可以解释为多种用途。值得注意的是,与相同厚度的非磁性木材相比,3 mm厚的磁性木材在8-12 GHz的X波段显示出5-10 dB(或7-10倍)的电磁波衰减增强。磁性木材对电磁波吸收的增强主要是由于与非磁性木材相比,其磁损耗角正切增强。这项工作为开发用于多功能磁性应用的可持续,轻质和环保木材提供了启发性的策略。
更新日期:2020-06-05
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