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Open AccessArticle

Multi-Modal Contractive Forces of Wools as Actuator

by Shanshan Zhu 1 and Jinlian Hu 2,*
Institute of Advanced Integration Technology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
Department of Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong 999077, China
Author to whom correspondence should be addressed.
Polymers 2020, 12(7), 1464;
Received: 16 April 2020 / Revised: 19 May 2020 / Accepted: 22 May 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Renaissance of Fibers and Fibrous Materials)
Wool has a long history of use in textiles throughout human civilization. Many smart functions such as reversible shape changes to various stimuli have been demonstrated in the last few years. However, the force-related characteristics are still imperfectly recognized, although they are expected to be used as actuators due to their biological origins and broad applications. Herein, we investigated the feasibility of wools in performing actuating ability through its intrinsic structures and fabrication methods. The diverse modes of contractive forces were obtained in wool materials including platform-like, double-peak, and slope-like shapes, where a molecular model was also presented to trace the origins of stress evolution. After that, a polymeric blend was created to modify the wool materials and a dissimilar performance of stress production was achieved, a square stress mode with stable manner and maintenance, for broad applications in a more efficient way. It is believed that these actuating properties extracted from natural hairs have a large potential in current smart applications and lay down new inspiration in designing actuators. View Full-Text
Keywords: wool; wool yarn/polymeric yarn blends; twisted structure; isometric stress; actuator wool; wool yarn/polymeric yarn blends; twisted structure; isometric stress; actuator
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MDPI and ACS Style

Zhu, S.; Hu, J. Multi-Modal Contractive Forces of Wools as Actuator. Polymers 2020, 12, 1464.

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