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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
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New twist on artificial muscles.

Carter S Haines1, Na Li2, Geoffrey M Spinks3

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Proceedings of the National Academy of Sciences of the United States of America
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New artificial muscles made from twisted polymer fibers offer significant advancements over natural muscles, providing high work output and long-lasting, efficient actuation for diverse applications.

Keywords:
actuatorsartificial musclescarbon nanotubestextilesyarns

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Area of Science:

  • Materials Science
  • Biomimetics
  • Robotics

Background:

  • Artificial muscles have historically faced challenges with low stroke, limited cycle life, and inefficient energy conversion.
  • High cost and hysteretic performance have further restricted the practical application of existing artificial muscle technologies.

Purpose of the Study:

  • To explore the mechanisms and potential applications of highly twisted fiber artificial muscles.
  • To identify future opportunities and challenges for developing advanced twisted muscle technologies.

Main Methods:

  • Utilizing highly twisted polymer fibers to create artificial muscle actuators.
  • Investigating thermally actuated muscles for tensile and torsional actuation capabilities.
  • Demonstrating artificial muscle sewing threads, textiles, and coiled structures.

Main Results:

  • Twisted fiber muscles achieve specific work outputs exceeding 2,000 J/kg, significantly surpassing natural muscle's 40 J/kg.
  • Thermally actuated muscles demonstrate long-life, hysteresis-free tensile strokes over 30% and high-speed torsional actuation (>100,000 rpm).
  • Coiled structures exhibit nearly unlimited actuation strokes, and functional textiles were successfully demonstrated.

Conclusions:

  • Highly twisted fiber artificial muscles represent a significant breakthrough, overcoming limitations of previous technologies.
  • These artificial muscles offer promising applications in robotics, prosthetics, and smart textiles.
  • Further development is needed to enhance cycle rates, efficiencies, and overall functionality for broader adoption.