基于 MXene 的软致动器越来越受到关注,并在超级电容器、仿生机器人和人造肌肉等各种智能设备中表现出具有竞争力的性能。然而,开发具有多刺激响应性的基于 MXene 的坚固致动器仍然具有挑战性。本研究采用简单的溶剂浇铸自组装方法制备了一种基于 MXene 和海藻酸钠 (SA) 复合薄膜的珍珠层状结构软致动器,不仅提高了材料的机械性能(抗拉强度为 72 MPa),而且使材料的刺激响应性多样化。复合致动器可以由可再生能源的外部刺激提供动力,例如在相对湿度 (RH) 为 91% 的情况下,水分会产生 190 度的最大弯曲角度,以及在 100 mW cm-2 下产生最大曲率为 1.45 cm-1 的阳光照射。通过全面的实验表征和性能评估,证明了实际应用的可行性,包括湿度响应的花朵和助行器、阳光响应振荡器和智能开关。这里介绍的工作为通过利用和转换环境可再生能源来设计坚固的执行器提供了见解。
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Reinforced Nacre‐Like MXene/Sodium Alginate Composite Films for Bioinspired Actuators Driven by Moisture and Sunlight
MXene‐based soft actuators have attracted increasing attention and shown competitive performance in various intelligent devices such as supercapacitors, bionic robots and artificial muscles. However, the development of robust MXene‐based actuators with multi‐stimuli responsiveness remains challenging. In this study, a nacre‐like structure soft actuator based on MXene and sodium alginate (SA) composite films is prepared using a straightforward solvent casting self‐assembly method, which not only enhances the mechanical performance (tensile strength of 72 MPa) but also diversifies the stimuli responsiveness of the material. The composite actuators can be powered by external stimuli from renewable energy sources, from moisture inducing a maximum bending angle of 190 degrees at a relative humidity (RH) of 91%, and sunlight irradiation generating a maximum curvature of 1.45 cm−1 under 100 mW cm−2. The feasibility of practical applications, including moisture‐responsive flowers and walkers, sunlight‐responsive oscillators, and smart switches, is demonstrated through comprehensive experimental characterization and performance evaluation. The work presented here provides insight into the design of robust actuators via the utilization and conversion of environmentally renewable energy sources.