Reconfigurable Micro- and Nano-Structured Camouflage Surfaces Inspired by Cephalopods,ACS Nano

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Reconfigurable Micro- and Nano-Structured Camouflage Surfaces Inspired by Cephalopods
ACS Nano ( IF 15.8 ) Pub Date : 2021-10-11 , DOI: 10.1021/acsnano.0c09990
Yinuan Liu ₁ , Zhijing Feng ₂ , Chengyi Xu ₃ , Atrouli Chatterjee ₂ , Alon A Gorodetsky _{1,

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Affiliation

Wrinkled surfaces and materials are found throughout the natural world in various plants and animals and are known to improve the performance of emerging optical and electrical technologies. Despite much progress, the reversible post-fabrication tuning of wrinkle sizes and geometries across multiple length scales has remained relatively challenging for some materials, and the development of comprehensive structure–function relationships for optically active wrinkled surfaces has often proven difficult. Herein, by drawing inspiration from natural cephalopod skin and leveraging methodologies established for artificial adaptive infrared platforms, we engineer systems with hierarchically reconfigurable wrinkled surface morphologies and dynamically tunable visible-to-infrared spectroscopic properties. Specifically, we demonstrate architectures for which mechanical actuation changes the surface morphological characteristics; modulates the reflectance, transmittance, and absorptance across a broad spectral window; controls the specular-to-diffuse reflectance ratios; and alters the visible and thermal appearances. Moreover, we demonstrate the incorporation of these architectures into analogous electrically actuated appearance-changing devices that feature competitive figures of merit, such as reasonable maximum areal strains, rapid response times, and good stabilities upon repeated actuation. Overall, our findings constitute another step forward in the continued development of cephalopod-inspired light- and heat-manipulating systems and may facilitate advanced applications in the areas of sensing, electronics, optics, soft robotics, and thermal management.

中文翻译：

受头足类动物启发的可重构微结构和纳米结构迷彩表面

皱纹表面和材料在自然界的各种植物和动物中随处可见，并且众所周知可以提高新兴光学和电子技术的性能。尽管取得了很大进展，但对于某些材料而言，跨多个长度尺度的皱纹尺寸和几何形状的可逆制造后调整仍然相对具有挑战性，并且光学活性皱纹表面的综合结构 - 功能关系的发展通常被证明是困难的。在此，通过从天然头足类动物皮肤中汲取灵感并利用为人工自适应红外平台建立的方法，我们设计了具有分层可重构皱纹表面形态和动态可调可见光到红外光谱特性的系统。具体来说，我们展示了机械驱动改变表面形态特征的架构；在宽光谱窗口内调制反射率、透射率和吸收率；控制镜面反射与漫反射的比率；并改变可见和热外观。此外，我们展示了将这些架构结合到类似的电动外观改变设备中，这些设备具有具有竞争力的品质因数，例如合理的最大面应变、快速响应时间和重复驱动时的良好稳定性。总的来说，我们的研究结果在继续开发受头足类动物启发的光和热操纵系统方面又向前迈出了一步，并可能促进传感、电子、光学、软机器人和热管理领域的高级应用。

更新日期：2021-11-23

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