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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Crystal Field Theory
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Related Experiment Video

Updated: Feb 14, 2026

Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Polydopamine-Coated Main-Chain Liquid Crystal Elastomer as Optically Driven Artificial Muscle.

Hongmiao Tian1, Zhijian Wang, Yilong Chen

  • 1Micro- and Nano-technology Research Center, State Key Laboratory for Manufacturing Systems Engineering , Xi'an Jiaotong University , 28 Xianning Road , Xi'an 710049 , P. R. China.

ACS Applied Materials & Interfaces
|February 16, 2018
PubMed
Summary

Researchers developed a novel polydopamine-coated liquid crystal elastomer (LCE) that acts as an optically driven artificial muscle. This material exhibits rapid, precise motion upon near-infrared light exposure, outperforming natural muscle in stress generation.

Keywords:
artificial muscleliquid crystal elastomeroptically driven actuatorspolydopaminesoft robots

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Area of Science:

  • Materials Science
  • Robotics
  • Optomechanics

Background:

  • Optically driven active materials offer contactless remote control of deformation and motion.
  • Liquid crystal elastomers (LCEs) are known for their thermal responsiveness.
  • Polydopamine (PDA) exhibits a photothermal effect when exposed to near-infrared (NIR) light.

Purpose of the Study:

  • To investigate the optically actuated properties of polydopamine-coated LCE.
  • To evaluate the potential of PDA-coated LCE as an artificial muscle.
  • To demonstrate applications in soft robotics.

Main Methods:

  • Coating LCE films with polydopamine.
  • Irradiating PDA-coated LCE with near-infrared (NIR) light.
  • Measuring light-induced actuating stress and response time.
  • Fabricating a prototype robotic swimmer.

Main Results:

  • PDA-coated LCE films contracted significantly upon NIR irradiation due to photothermal and thermal effects.
  • Actuating stress reached 1.5 MPa, exceeding that of mammalian skeletal muscle.
  • Response time was as fast as 1/10 of a second.
  • A robotic swimmer prototype demonstrated controlled swimming motions.

Conclusions:

  • PDA-coated LCE is a promising optically driven artificial muscle.
  • The material exhibits rapid response, high actuating stress, and controllable motion.
  • Potential applications include soft robotics and optomechanical devices.