Gu Weihua, Sheng Jiaqi, Huang Qianqian, Wang Gehuan, Chen Jiabin, Ji Guangbin
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People's Republic of China.
Shenyang Aircraft Design Institute Yangzhou Collaborative Innovation Research Institute Co., Ltd, Shenyang, 225002, People's Republic of China.
Nanomicro Lett. 2021 Apr 5;13(1):102. doi: 10.1007/s40820-021-00635-1.
The eco-friendly shaddock peel-derived carbon aerogels were prepared by a freeze-drying method. Multiple functions such as thermal insulation, compression resistance and microwave absorption can be integrated into one material-carbon aerogel. Novel computer simulation technology strategy was selected to simulate significant radar cross-sectional reduction values under real far field condition. . Eco-friendly electromagnetic wave absorbing materials with excellent thermal infrared stealth property, heat-insulating ability and compression resistance are highly attractive in practical applications. Meeting the aforesaid requirements simultaneously is a formidable challenge. Herein, ultra-light carbon aerogels were fabricated via fresh shaddock peel by facile freeze-drying method and calcination process, forming porous network architecture. With the heating platform temperature of 70 °C, the upper surface temperatures of the as-prepared carbon aerogel present a slow upward trend. The color of the sample surface in thermal infrared images is similar to that of the surroundings. With the maximum compressive stress of 2.435 kPa, the carbon aerogels can provide favorable endurance. The shaddock peel-based carbon aerogels possess the minimum reflection loss value (RL) of - 29.50 dB in X band. Meanwhile, the effective absorption bandwidth covers 5.80 GHz at a relatively thin thickness of only 1.7 mm. With the detection theta of 0°, the maximum radar cross-sectional (RCS) reduction values of 16.28 dB m can be achieved. Theoretical simulations of RCS have aroused extensive interest owing to their ingenious design and time-saving feature. This work paves the way for preparing multi-functional microwave absorbers derived from biomass raw materials under the guidance of RCS simulations.
采用冷冻干燥法制备了环保型柚皮衍生碳气凝胶。保温、抗压和微波吸收等多种功能可集成于一种材料——碳气凝胶中。选用新颖的计算机模拟技术策略，以模拟在实际远场条件下显著的雷达截面缩减值。具有优异热红外隐身性能、隔热能力和抗压性的环保型电磁波吸收材料在实际应用中极具吸引力。同时满足上述要求是一项艰巨的挑战。在此，通过简便的冷冻干燥法和煅烧工艺，利用新鲜柚皮制备了超轻碳气凝胶，形成了多孔网络结构。在加热平台温度为70℃时，所制备碳气凝胶的上表面温度呈缓慢上升趋势。热红外图像中样品表面的颜色与周围环境相似。碳气凝胶的最大抗压应力为2.435kPa，能提供良好的耐久性。基于柚皮的碳气凝胶在X波段的最小反射损耗值（RL）为-29.50dB。同时，在仅1.7mm的相对薄厚度下，有效吸收带宽覆盖5.80GHz。在检测角度θ为0°时，可实现最大雷达截面（RCS）缩减值16.28dB m。RCS的理论模拟因其巧妙的设计和省时的特点而引起了广泛关注。这项工作为在RCS模拟的指导下制备源自生物质原料的多功能微波吸收体铺平了道路。
