1 Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China 2 School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China
Abstract: Artificial muscle research is a highly interdisciplinary field that has been developing rapidly in the past three decades. Artificial muscle refers to a kind of material that will undergo structural change and will consequently be deformed when exposed to external stimuli such as voltage, current, temperature, pressure, light, and humidity. It plays an important role in various applications such as soft robots, artificial limbs, exoske-letons, and temperature-regulating clothing. According to their macroscopic appearance, artificial muscles can be classified into membranous muscles and fibrous muscles, in which the former, through their coiled structure, can convert the external-stimuli-induced volume expansion into radial rotation and axial contraction, and thus can achieve rotational actuation and contractile actuation, respectively, exhibiting obvious superiority to some existing membranous actuators in energy conversion efficiency, power density, and working performance. In addition, artificial muscles yarns can be knitted and woven into sophisticated structures which are capable of performing desired movements far more complicated than contraction and rotation, and which have excellent mechanical properties, good flexibility and similarity to natural biological muscles. Moreover, artificial muscles fibers can be actuated by various approaches such as thermal expansion, solvent/gas adsorption or infiltration, electrochemical double-layer charge injection, or even compressed air (pneumatic actuating). In recent years, there has been tremendous success in the study of artificial muscles produced from flexible fibrous materials. Artificial polymer fibers, artificial inorganic fibers, and natural fibers, owing to their inherent flexibility, are the main raw materials. In this review, we highlight the state-of-the-art researches on fibrous artificial muscles from the perspectives of constituent materials, working mechanisms, actuating modes, evaluative parameters, and relevant intelligent fabrics which can be obtained. We also discuss critically but briefly some key obstructive issues in this field.
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