宽带电磁波吸收使用纯碳气凝,通过协同调节传播路径和碳化程度来吸收宽带电磁波
Xiaogang Su1, Jun Wang2, Mengjie Han2
1Key Laboratory of Functional Nanocomposites of Shanxi Province, School of Materials Science and Engineering, North University of China, Taiyuan 030051, China; Air and Missile Defense College, Air Force Engineering University, Xi'an 710051, China.
Journal of colloid and interface science
|August 24, 2023
概括
具有定向结构的纯碳气凝提供了增强的电磁波 (EM) 吸收. 这种新的方法利用改性碳纳米纤维,在隐形应用中提供卓越的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 电磁主义 电磁主义
背景情况:
- 碳材料由于其导电性和耐用性,被广泛用于电磁波 (EM) 吸收.
- 传统的方法通常需要将碳与其他材料相结合,以有效吸收.
- 开发具有增强吸收性质的纯碳基材料是一个持续的挑战.
研究的目的:
- 开发一种用于增强电磁波吸收的新策略,使用具有定向结构的纯碳气凝.
- 为了研究调制波传播路径和碳化程度对电磁吸收的协同效应.
- 探索细菌纤维素衍生改性碳纳米纤维 (MCNF) 和碳纳米纤维@减少氧化石墨烯 (CNF@RGO) 在EM波吸收材料 (EWAM) 中的潜力.
主要方法:
- 使用温度场制造面向碳气凝结构.
- 加入改性碳纳米纤维 (MCNF) 和碳纳米纤维@减少的氧化石墨烯 (CNF@RGO).
- 通过变化温度调整碳化程度,以及对异构型EM构成参数的表征.
- 有限元模拟和理论分析,以了解电磁波相互作用.
主要成果:
- 定向结构诱导了异构电磁特征 (εx ≠ εz).
- 在700°C的最佳碳化下,最大反射损失为-53.94dB,有效吸收带宽为7.14GHz.
- 这种超轻型气凝 (3.6 mg/cm3) 具有超性,可压缩性和绝热性.
结论:
- 开发的具有定向结构的纯碳气凝显著增强了EM波的吸收.
- 波传播和碳化程度的协同调节是实现卓越性能的关键.
- 这一战略为设计用于先进隐形应用的宽带多功能EWAM提供了一个有前途的途径.
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