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首页> 外文期刊>RSC Advances >High-performance electromagnetic wave absorbing composites prepared by one-step transformation of Fe3+ mediated egg-box structure of seaweed
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High-performance electromagnetic wave absorbing composites prepared by one-step transformation of Fe3+ mediated egg-box structure of seaweed

机译：通过Fe3 +介导的海藻蛋白蛋壳结构的一步转化制备的高性能电磁波吸收复合材料

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Composites incorporating ferromagnetic components into a highly porous carbon matrix are promising as electromagnetic wave absorption materials; however, the design of a facile preparation process with scale-up potentiality still remains a practical challenge. Herein, a new kind of three-dimensional (3D) magnetic carbonaceous bead-like (MCB) Fe–SA- X composites has been directly prepared using a Fe ~(3+) mediated egg-box structure of renewable sodium alginate as single starting material and a controllable carbonization process; as compared to previous work on carbon-based microwave absorbers, it avoids tedious and time-consuming preparation procedures. It was verified that, according to various characterization results, the atmosphere and temperature for the carbonization of Fe–SA precursors were crucial factors for the formation of the ferromagnetic metal particles and carbon matrix in the porous Fe–SA- X composites. Among the Fe–SA- X composites obtained at different temperatures, Fe–SA-600 obtained at 600 °C exhibited the best performance for electromagnetic wave absorption, for which can be attributed to the synergy of magnetism of Fe _(3) O _(4) nanoparticles and the nano-network of graphitized carbon. The maximum reflection loss (RL) of Fe–SA-600 reached ?24 dB, and the effective absorption bandwidth (RL ≤ ?10 dB) was 4.80 GHz (13.2–18 GHz) corresponding to an absorber thickness of only 1.5 mm. Such excellent electromagnetic absorption properties could be assigned to the improvement of the impedance match and interfacial polarization and unique porous structures, by which can lead to the effective microwave multi-reflection and scattering. This kind of composite is an attractive candidate for new types of high-performance electromagnetic wave-absorbing materials, meeting for the current requirements of wide-band absorption, high efficiency absorption capability, thin thickness and light weight.
机译：将铁磁组分掺入高孔碳基质中的复合材料是有前途的，作为电磁波吸收材料;然而，具有扩大潜力的便利制备过程的设计仍然是一个实际挑战。这里，使用Fe〜（3+）介导的藻酸钠作为单一开始，直接制备新的三维（3D）磁性碳质珠状（MCB）Fe-Sa-X复合材料。材料和可控碳化过程;与之前的基于碳微波吸收器的工作相比，它避免了乏味且耗时的准备程序。验证了，根据各种表征结果，Fe-SA前体的碳化的气氛和温度是在多孔Fe-Sa-X复合材料中形成铁磁性金属颗粒和碳基质的关键因素。在不同温度下获得的Fe-SA-X复合材料中，在600℃下获得的Fe-SA-600表现出用于电磁波吸收的最佳性能，其可归因于FE _（3）O _磁性的协同作用。 （4）纳米粒子和石墨化碳的纳米网络。 Fe-SA-600的最大反射损耗（RL）达到？24 dB，有效的吸收带宽（RL≤≤10dB）为4.80GHz（13.2-18GHz），对应于仅1.5毫米的吸收率。可以将这种优异的电磁吸收特性分配给阻抗匹配和界面偏振和独特的多孔结构的改善，其可以导致有效的微波多反射和散射。这种复合材料是新型高性能电磁波吸收材料的有吸引力的候选人，满足电流要求宽带吸收，高效吸收能力，薄厚度和重量轻。

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