Enhancing the Work Capacity of Electrochemical Artificial Muscles by Coiling Plies of Twist-Released Carbon Nanotube Yarns

Kim, Keon Jung; Hyeon, Jae Sang; Kim, Hyunsoo; Mun, Tae Jin; Haines, Carter S.; Li, Na; Baughman, Ray H.; Kim, Seon Jeong

doi:10.1021/acsami.8b21417

Cited by 36 publications

(22 citation statements)

References 34 publications

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“…Kim and colleagues developed a three‐level hierarchical yarn consisting of twist, plying, and coiling to optimize contraction stroke. [ 354 ] Through their highly‐architectured structure they obtained a maximum tensile stroke of 15.1% for an applied stress of 36.4 MPa. Additionally, alternative materials systems have been explored, either to improve actuation performance or to increase manufacturability of electrochemically actuating yarns.…”

Section: Textile Actuators For Wearable Robotsmentioning

confidence: 99%

Textile Technology for Soft Robotic and Autonomous Garments

Sánchez¹,

Walsh²,

Wood³

2020

Adv Funct Materials

168

123

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Textiles have emerged as a promising class of materials for developing wearable robots that move and feel like everyday clothing. Textiles represent a favorable material platform for wearable robots due to their flexibility, low weight, breathability, and soft hand‐feel. Textiles also offer a unique level of programmability because of their inherent hierarchical nature, enabling researchers to modify and tune properties at several interdependent material scales. With these advantages and capabilities in mind, roboticists have begun to use textiles, not simply as substrates, but as functional components that program actuation and sensing. In parallel, materials scientists are developing new materials that respond to thermal, electrical, and hygroscopic stimuli by leveraging textile structures for function. Although textiles are one of humankind's oldest technologies, materials scientists and roboticists are just beginning to tap into their potential. This review provides a textile‐centric survey of the current state of the art in wearable robotic garments and highlights metrics that will guide materials development. Recent advances in textile materials for robotic components (i.e., as sensors, actuators, and integration components) are described with a focus on how these materials and technologies set the stage for wearable robots programmed at the material level.

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Section: Textile Actuators For Wearable Robotsmentioning

confidence: 99%

Textile Technology for Soft Robotic and Autonomous Garments

Sánchez¹,

Walsh²,

Wood³

2020

Adv Funct Materials

168

123

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“…[8] Very recently, Kim et al demonstrated a multiplied CNT yarn muscle that provided a contractile work capacity of 3.78 kJ kg −1 . [23] However, the use of a liquid working system severely limits the practical application of the above-mentioned electrochemical yarn muscles.…”

mentioning

confidence: 99%

Strong and Robust Electrochemical Artificial Muscles by Ionic‐Liquid‐in‐Nanofiber‐Sheathed Carbon Nanotube Yarns

Ren

Qiao

Wang

et al. 2021

Small

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To address the lack of a suitable electrolyte that supports the stable operation of the electrochemical yarn muscles in air, an ionic‐liquid‐in‐nanofibers sheathed carbon nanotube (CNT) yarn muscle is prepared. The nanofibers serve as a separator to avoid the short‐circuiting of the yarns and a reservoir for ionic liquid. The ionic‐liquid‐in‐nanofiber‐sheathed yarn muscles are strong, providing an isometric stress of 10.8 MPa (about 31 times the skeletal muscles). The yarn muscles are highly robust, which can reversibly contract stably at such conditions as being knotted, wide‐range humidity (30 to 90 RH%) and temperature (25 to 70 °C), and long‐term cycling and storage in air. By utilizing the accumulated isometric stress, the yarn muscles achieve a high contraction rate of 36.3% s−1. The yarn muscles are tightly bundled to lift heavy weights and grasp objects. These unique features can make the strong and robust yarn muscles as a desirable actuation component for robotic devices.

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“…Kim et al have designed a hierarchically twisted electrochemical driven CNT yarn with a maximum tensile stroke of 15.1% and work capacity of 3.78 kJ/kg. [168]. This twisted and coil structure achieves the transformation of electrochemical driven CNT yarn from rotation actuation to stretching actuation (Figure 25b).…”

Section: Carbon Nanotubesmentioning

confidence: 96%

Wearable Actuators: An Overview

Chen

Yang

et al. 2021

Textiles

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The booming wearable market and recent advances in material science has led to the rapid development of the various wearable sensors, actuators, and devices that can be worn, embedded in fabric, accessorized, or tattooed directly onto the skin. Wearable actuators, a subcategory of wearable technology, have attracted enormous interest from researchers in various disciplines and many wearable actuators and devices have been developed in the past few decades to assist and improve people’s everyday lives. In this paper, we review the actuation mechanisms, structures, applications, and limitations of recently developed wearable actuators including pneumatic and hydraulic actuators, shape memory alloys and polymers, thermal and hygroscopic materials, dielectric elastomers, ionic and conducting polymers, piezoelectric actuators, electromagnetic actuators, liquid crystal elastomers, etc. Examples of recent applications such as wearable soft robots, haptic devices, and personal thermal regulation textiles are highlighted. Finally, we point out the current bottleneck and suggest the prospective future research directions for wearable actuators.

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Enhancing the Work Capacity of Electrochemical Artificial Muscles by Coiling Plies of Twist-Released Carbon Nanotube Yarns

Cited by 36 publications

References 34 publications

Textile Technology for Soft Robotic and Autonomous Garments

Textile Technology for Soft Robotic and Autonomous Garments

Strong and Robust Electrochemical Artificial Muscles by Ionic‐Liquid‐in‐Nanofiber‐Sheathed Carbon Nanotube Yarns

Wearable Actuators: An Overview

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