深共晶溶剂
丝绸
材料科学
纳米纤维
湿度
溶剂
共晶体系
化学工程
执行机构
纳米技术
复合材料
高分子科学
高分子化学
化学
有机化学
微观结构
计算机科学
工程类
人工智能
物理
热力学
作者
Haixun Sun,Mingjie Zhang,Bing Wang,Miao Su,Xiangdong Liu,Feiya Fu
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2024-04-26
卷期号:12 (18): 6870-6880
标识
DOI:10.1021/acssuschemeng.3c07156
摘要
Exploring high-performance flexible actuators derived from natural resources is crucial for the development of green and environmentally friendly smart devices. In this study, we exfoliated natural silk using a green deep eutectic solvent (DES) to obtain silk nanofibers with average diameters and lengths in the ranges of 30–40 and 2–5 μm, respectively. After the DES treatment, the internal secondary conformation of silk changed; the concentration of β-sheets increased; and the random coil structure was destroyed. Furthermore, a silk nanofibrous membrane was fabricated via suction filtration-induced self-assembly. The fabricated actuators demonstrated an outstanding response speed of 25 s–1 within a relative humidity range of 0–70%, accompanied by a maximum response value of 70%. They exhibited exceptional durability, with a bending capability of 1.1 cm–1, and could be folded up to 20 times. By leveraging these properties, we successfully developed a unique robot capable of directional crawling and weightlifting through moisture-driven mechanisms. Notably, this innovative robot exhibited an extraordinary lifting capacity, which exceeded ten times its own weight. This paper presents a green and environmentally friendly next-generation method for manufacturing natural biobased humidity-responsive actuators.
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