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Synthesis of Magnetic Wood with Excellent and Tunable Electromagnetic Wave-Absorbing Properties by a Facile Vacuum/Pressure Impregnation Method
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-12-14 00:00:00 , DOI: 10.1021/acssuschemeng.7b03332 Zhichao Lou 1, 2 , He Han 1 , Ming Zhou 1 , Jingquan Han 1 , Jiabin Cai 1 , Caoxing Huang 3 , Jing Zou 1 , Xiaoyan Zhou 1 , Hongjie Zhou 4 , Zhaobin Sun 5
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-12-14 00:00:00 , DOI: 10.1021/acssuschemeng.7b03332 Zhichao Lou 1, 2 , He Han 1 , Ming Zhou 1 , Jingquan Han 1 , Jiabin Cai 1 , Caoxing Huang 3 , Jing Zou 1 , Xiaoyan Zhou 1 , Hongjie Zhou 4 , Zhaobin Sun 5
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Herein, magnetic wood was successfully prepared by in situ synthesizing Fe3O4 in wood, through coprecipitation chemical interactions. A facile impregnation method, vacuum impregnation followed by pressure impregnation, was introduced to transport the adequate amount of ferric salt precursor and to further shorten the required production cycle. It was demonstrated that the obtained products exhibited outstanding microwave-absorbing properties. The best electromagnetic interference (EMI) absorbing properties could reach −64.26 dB at 14.36 GHz with the matching thickness of only 2.25 mm and broad absorbing bandwidth (|RL| > 10 dB) of 5.20 GHz covering 12.80–18.00 GHz. The subsequent thorough investigations proved that this good shielding property was due to the distinctive self-assembling morphology of Fe3O4 formed in the inner surface of the lumen walls in wood, which permitted optimal impedance matching, the strongest dielectric loss, optimal magnetic loss, and an interconnected conductive network for electron hopping and migrating. This synthetic process for magnetic wood is quite facile, and the resulted EMI absorbing properties are tunable by the concentrations of the iron precursor solutions and the thickness values. This kind of synthetic magnetic wood can be potentially used as light-weight, flexible, and strong absorbing performance shielding materials for construction, furniture, decoration, and packing.
中文翻译：
简便的真空/压力浸渍法合成具有优异的可调节电磁波吸收性能的磁性木材
本文通过原位合成Fe 3 O 4成功地制备了磁性木通过共沉淀化学相互作用而在木材中 引入了一种简单的浸渍方法，先进行真空浸渍，再进行压力浸渍，以运输足够量的三价铁盐前体，并进一步缩短所需的生产周期。证明了所获得的产品表现出优异的微波吸收性能。最佳的电磁干扰（EMI）吸收性能在14.36 GHz时可以达到−64.26 dB，匹配厚度仅为2.25 mm，宽吸收带宽（| RL |> 10 dB）为5.20 GHz，覆盖12.80–18.00 GHz。随后的深入研究证明，这种良好的屏蔽性能是由于Fe 3 O 4具有独特的自组装形态它形成于木材内腔壁的内表面，可以实现最佳的阻抗匹配，最强的介电损耗，最佳的磁损耗，以及用于电子跳跃和迁移的互连导电网络。这种用于磁性木材的合成方法非常容易，并且所产生的EMI吸收特性可通过铁前体溶液的浓度和厚度值进行调节。这种合成磁性木材可以潜在地用作建筑，家具，装饰和包装的轻质，柔性和强吸收性能的屏蔽材料。
更新日期：2017-12-14
中文翻译：
简便的真空/压力浸渍法合成具有优异的可调节电磁波吸收性能的磁性木材
本文通过原位合成Fe 3 O 4成功地制备了磁性木通过共沉淀化学相互作用而在木材中 引入了一种简单的浸渍方法，先进行真空浸渍，再进行压力浸渍，以运输足够量的三价铁盐前体，并进一步缩短所需的生产周期。证明了所获得的产品表现出优异的微波吸收性能。最佳的电磁干扰（EMI）吸收性能在14.36 GHz时可以达到−64.26 dB，匹配厚度仅为2.25 mm，宽吸收带宽（| RL |> 10 dB）为5.20 GHz，覆盖12.80–18.00 GHz。随后的深入研究证明，这种良好的屏蔽性能是由于Fe 3 O 4具有独特的自组装形态它形成于木材内腔壁的内表面，可以实现最佳的阻抗匹配，最强的介电损耗，最佳的磁损耗，以及用于电子跳跃和迁移的互连导电网络。这种用于磁性木材的合成方法非常容易，并且所产生的EMI吸收特性可通过铁前体溶液的浓度和厚度值进行调节。这种合成磁性木材可以潜在地用作建筑，家具，装饰和包装的轻质，柔性和强吸收性能的屏蔽材料。
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