In the modern battlefield, the use of multi-spectral detection techniques that combine the use of infrared and radar bands is prevalent, making the survivability of high-value targets poor. Consequently, there is an urgent need to develop materials that can withstand multi-spectral detection. Here, a multifunctional aerogel composite of hyperbranched gel (HPY) and MXene (Ti₃C₂T_x) is proposed to simultaneously resist multi-spectral detection. The surface of the aerogel has aligned porous walls, which gives the aerogel excellent thermal insulation, with a surface temperature of only 45.2 °C after being kept on a hot platform at 200 °C for 420 min. Most importantly, the aerogel exhibits a double absorption peak with a minimum reflection loss of −55.05 dB at 4.26 GHz and −49.43 dB at 16.68 GHz. Most notably, the widest effective absorption bandwidth (EAB) reaches 8.1 GHz with a matched thickness of only 1.7 mm. The incorporation of HPY alters the internal pore size of the aerogel, thereby developing an internal thermal insulation structure. Furthermore, the parallel hollow walls on the surface of the aerogel permit electromagnetic waves to enter the interior, while the composite structure endows the aerogel with multiple electromagnetic wave loss mechanisms.

中文翻译：

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通过超支化凝胶改性的多功能 MXene 复合气凝胶


在现代战场上，普遍使用红外和雷达波段相结合的多光谱探测技术，使得高价值目标的生存能力较差。因此，迫切需要开发能够承受多光谱检测的材料。在这里，提出了一种超支化凝胶（HPY）和MXene（Ti ₃ C ₂ T _x ）的多功能气凝胶复合材料，可以同时抵抗多光谱检测。气凝胶表面具有排列整齐的多孔壁，这使得气凝胶具有优异的隔热性能，在200℃的热平台上放置420分钟后，其表面温度仅为45.2℃。最重要的是，气凝胶表现出双吸收峰，4.26 GHz 时的最小反射损耗为 -55.05 dB，16.68 GHz 时的最小反射损耗为 -49.43 dB。最值得注意的是，最宽的有效吸收带宽 (EAB) 达到 8.1 GHz，而匹配厚度仅为 1.7 mm。 HPY 的加入改变了气凝胶的内部孔径，从而形成了内部隔热结构。此外，气凝胶表面的平行中空壁允许电磁波进入内部，而复合结构赋予气凝胶多种电磁波损失机制。