Liu Yuan, Bi Ran, Zhang Xuan, Chen Yuanhao, Valenzuela Cristian, Yang Yanzhao, Liu Huan, Yang Le, Wang Ling, Feng Wei
School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, P. R. China.
Binhai Industrial Research Institute, Tianjin University, Tianjin, 300452, P. R. China.
Angew Chem Int Ed Engl. 2025 Mar 17;64(12):e202422636. doi: 10.1002/anie.202422636. Epub 2025 Jan 7.
Multispectral camouflage materials that provide adaptable features across a wide spectrum, from visible light to radar frequencies, play a vital role in sophisticated multi-band electromagnetic (EM) applications. However, conventional single-band stealth is difficult to align with the growing demand for multi-band compatibility and intelligent adaptation. Herein, we report the design and synthesis of cephalopod-inspired MXene-integrated cholesteric liquid crystal elastomers (MXene-CLCEs) with multispectral camouflage capability, which was fabricated through in situ thiol-acrylate Michael addition and free-radical photopolymerization of CLCE precursor and isocyanate-mediated robust covalent chemical bonding of MXene nanocoating at the interface. The resulting MXene-CLCE exhibits dynamic structural color changes, tunable infrared radiation, and switchable microwave shielding across wide ranges upon mechanical stretching, with its infrared stealth and microwave shielding properties being realized through the reconfiguration of surface morphology from planar to cracked states via mechanical actuation. A visible-to-infrared camouflage octopus-patterned MXene-CLCE is demonstrated to achieve a stealth effect across the visible-infrared spectrum upon mechanical stretching. As an illustration, proof-of-concept pneumatic-driven octopus-inspired soft models are demonstrated, which enables dynamic visible-infrared camouflage and microwave shielding switching between two compatible states. The research herein can offer new perspectives on the development of bioinspired smart camouflage materials and their application in various emerging fields such as smart optical stealth, dynamic thermal management, and switchable electromagnetic devices.
多光谱伪装材料可在从可见光到雷达频率的广泛光谱范围内提供适应性特征，在复杂的多波段电磁（EM）应用中发挥着至关重要的作用。然而，传统的单波段隐身技术难以满足对多波段兼容性和智能适应性日益增长的需求。在此，我们报告了具有多光谱伪装能力的受头足类动物启发的集成MXene的胆甾型液晶弹性体（MXene-CLCEs）的设计与合成，其通过CLCE前体的原位硫醇-丙烯酸酯迈克尔加成和自由基光聚合以及界面处异氰酸酯介导的MXene纳米涂层的强共价化学键合制备而成。所得的MXene-CLCE在机械拉伸时表现出动态结构颜色变化、可调红外辐射和宽范围可切换微波屏蔽，其红外隐身和微波屏蔽性能是通过机械驱动使表面形态从平面状态重新配置为裂纹状态来实现的。展示了一种可见-红外伪装的章鱼图案MXene-CLCE，在机械拉伸时可在可见-红外光谱范围内实现隐身效果。作为示例，展示了概念验证的气动驱动的受章鱼启发的软模型，其能够在两种兼容状态之间进行动态可见-红外伪装和微波屏蔽切换。本文的研究可为受生物启发的智能伪装材料的开发及其在智能光学隐身、动态热管理和可切换电磁器件等各种新兴领域的应用提供新的视角。
