Hairs in homeothermic animals have multiple functions essential for survival, such as regulation of body temperature and camouflage, through adaptable reconfiguration in response to external environments. By contrast, humans wear clothes because the human skin is ineffective for thermoregulation and camouflage, but clothes do not exhibit dynamic responsiveness. In this work, we demonstrate a smart reconfigurable hairy skin based on a hair-patterned shape memory polymer (SMP) containing hierarchical porous micro/nanostructures, which has unique functions of dynamically responsive thermal insulation and camouflage from infrared surveillance. The hairy SMP exhibits high thermal insulation due to the long tortuous path of thermal transport in the micro/nanopores. The programmable shape of the hairy SMP enables the reversible reconfiguration of the hair geometry in response to temperature, leading to the dynamic control of thermal insulation by more than 61.4%. As a proof-of-concept, the smart hairy skin can be used as wearable thermal camouflage or thermal encryption films.

中文翻译：

---

刺激响应的微孔/纳米孔毛状皮肤，可实现隔热和红外伪装

恒温动物的毛发具有多种生存必需的功能，例如通过响应外部环境进行适应性重新配置来调节体温和伪装。相比之下，人类之所以穿衣服是因为人类的皮肤对温度调节和伪装无效，但是衣服没有表现出动态响应性。在这项工作中，我们展示了一种智能的可重构毛状皮肤，其基于包含分层的多孔微/纳米结构的头发图案形状记忆聚合物（SMP），具有动态响应的隔热和红外监视伪装的独特功能。由于微/纳米孔中热传递的长曲折路径，多毛的SMP具有很高的隔热性。毛发SMP的可编程形状使毛发几何形状可根据温度进行可逆的重新配置，从而实现了动态隔热控制超过61.4％。作为概念验证，聪明的多毛皮肤可以用作可穿戴的热伪装或热加密膜。