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A Liquid Metal Artificial Muscle.

Jian Shu1, Du-An Ge1, Erlong Wang1

  • 1CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui, 230027, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

Researchers developed a liquid metal artificial muscle (LMAM) that mimics natural muscles. This novel actuator operates at low voltage, offers high strain, and functions across a wide pH range, advancing soft robotics.

Keywords:
actuatorsartificial musclesliquid bridge forceliquid metalsuntethered robotic fish

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Area of Science:

  • Materials Science
  • Robotics
  • Biomimetics

Background:

  • Artificial muscles are crucial for robotics, prosthetics, and exoskeletons.
  • Existing actuators face challenges like high voltage, hysteresis, and water sensitivity.

Purpose of the Study:

  • To demonstrate a novel liquid metal artificial muscle (LMAM).
  • To leverage electrochemically tunable interfacial tension for muscle-like actuation.
  • To overcome limitations of current artificial muscle technologies.

Main Methods:

  • Fabrication of LMAMs using liquid metal.
  • Electrochemical control of interfacial tension for actuation.
  • Testing LMAM performance in various solutions and pH levels.
  • Integration into proof-of-concept applications and a bionic robotic fish.

Main Results:

  • LMAMs achieve actuation strains up to 87% with a speed of 15 mm s-1.
  • Operates effectively in solutions with pH ranging from 0 to 14.
  • Requires a low driving voltage of only 0.5 V.
  • Demonstrated in applications like displays, cargo delivery, optical reflectors, and a robotic fish.

Conclusions:

  • The liquid metal artificial muscle offers a promising alternative to conventional actuators.
  • Its liquid-based composition prevents mechanical fatigue and offers unconstrained movement.
  • LMAMs present significant potential for engineering and biomedical soft actuator applications.