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Twisted and coiled bamboo artificial muscles for moisture responsive torsional and tensile actuation |
Xiaoyu Hu(胡晓宇), Xueqi Leng(冷雪琪), Tianjiao Jia(贾天娇), and Zunfeng Liu(刘遵峰)† |
State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Chemistry, Key Laboratory of Functional Polymer Materials, Nankai University, Tianjin 300350, China |
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Abstract Smart textiles responding to the ambient environment like temperature, humidity, and light are highly desirable to improve the comfortability and realize multifunctions. The bamboo yarn has merits like air permeability, biodegradability, and excellent heat dissipation performance, but it has not been prepared for responsive materials and smart textiles. In this paper, the moisture-responsive twisted bamboo yarns were plied to form a self-balanced torsional actuator and wrapped around a mandrel to form a coil, followed by water immersion and evaporation to fix the shape and serve as a tensile actuator. A torsional actuation of 64.4°⋅ mm−1 was realized for the twisted actuator in 4.2 s; a maximum elongation of 133% or contraction of 50% was achieved for a coiled tensile actuator with good cyclability. The porous structure of bamboo yarns helped improve the water absorbance speed and decrease the response time of moisture. The self-balanced two-ply physical structure and reversible generation of chemical phase after soaking in aqueous solution fixed internal stress and provided good cyclability. With the unique properties including aqueous water-induced shape fixation and moisture-induced actuation, the application of tensile actuation of bamboo yarns was demonstrated, showing promising prospects on smart textiles.
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Received: 28 August 2020
Revised: 10 September 2020
Accepted manuscript online: 28 September 2020
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Fund: the State Key Development Program for Basic Research of China (Grant Nos. 2016YFA0200200 and 2017YFB0307001), the National Natural Science Foundation of China (Grant Nos. 51973093, U1533122, and 51773094), and the Natural Science Foundation of Tianjin, China (Grant No. 18JCZDJC36800). |
Corresponding Authors:
†Corresponding author. E-mail: liuzunfeng@nankai.edu.cn
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Cite this article:
Xiaoyu Hu(胡晓宇), Xueqi Leng(冷雪琪), Tianjiao Jia(贾天娇), and Zunfeng Liu(刘遵峰) Twisted and coiled bamboo artificial muscles for moisture responsive torsional and tensile actuation 2020 Chin. Phys. B 29 118103
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