Cephalopods evolve the acetylcholine-gated actuation control function of their skin muscles, which enables their dynamic/static multimode display capacities for achieving perfectly spatial control over the colors/patterns on every inch of skin. Reproduction of artificial analogs that exhibit similar multimodal display is essential to reach advanced information three-dimensional (3D) encoding with higher security than the classic 2D-encoding strategy, but remains underdeveloped. The core difficulty is how to replicate such chemical-gated actuation control function into artificial soft actuating systems. Herein, this work proposes to develop azobenzene-functionalized poly(acrylamide) (PAAm) hydrogel systems, whose upper critical solution temperature (UCST) type actuation responsiveness can be intelligently programmed or even gated by the addition of hydrophilic α-cyclodextrin (α-CD) molecules for reversible association with pendant azobenzene moieties via supramolecular host–guest interactions. By employing such α-CD-gated hydrogel actuator as an analogue of cephalopods’ skin muscle, biomimetic mechanically modulated multicolor fluorescent display systems are designed, which demonstrate a conceptually new α-CD-gated “thermal stimulation-hydrogel actuation-fluorescence output” display mechanism. Consequently, high-security 3D-encoding information carriers with an unprecedented combination of single-input multiple-output, dynamic/static dual-mode and spatially controlled display capacities are achieved. This bioinspired strategy brings functional-integrated features for artificial display systems and opens previously unidentified avenues for information security.

中文翻译：

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用于信息 3D 编码显示的头足类化学门控水凝胶驱动系统

头足类动物进化出了皮肤肌肉的乙酰胆碱门控驱动控制功能，这使得它们具有动态/静态多模式显示能力，从而实现对每一寸皮肤的颜色/图案的完美空间控制。表现出类似多模态显示的人工类似物的复制对于实现比经典 2D 编码策略安全性更高的高级信息三维 (3D) 编码至关重要，但仍不发达。核心难点是如何将这种化学门控驱动控制功能复制到人工软驱动系统中。在此，这项工作建议开发偶氮苯官能化聚（丙烯酰胺）（PAAm）水凝胶系统，其上临界溶液温度（UCST）型驱动响应可以通过添加亲水性α-环糊精（α-CD）进行智能编程甚至门控）分子通过超分子主客体相互作用与悬挂的偶氮苯部分进行可逆缔合。通过采用这种α-CD-门控水凝胶驱动器作为头足类动物皮肤肌肉的类似物，设计了仿生机械调制多色荧光显示系统，展示了一种新概念的α-CD-门控“热刺激-水凝胶驱动-荧光输出”显示机制。因此，实现了具有单输入多输出、动态/静态双模式和空间控制显示能力的前所未有的组合的高安全性3D编码信息载体。这种仿生策略为人工显示系统带来了功能集成的特性，并为信息安全开辟了以前未知的途径。