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Light-driven lattice soft microrobot with multimodal locomotion.

Mingduo Zhang1, Yuncheng Liu1, Chunsan Deng1

  • 1Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.

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Researchers developed light-driven lattice soft microrobots (LSMR) using metamaterials for enhanced movement. These microrobots achieve faster, more efficient locomotion and navigation, advancing microrobotics for biomedical applications.

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Area of Science:

  • Microrobotics
  • Materials Science
  • Biomedical Engineering

Background:

  • Untethered microrobots are crucial for bionics, biomedicine, and micromechanics.
  • Replicating natural microorganism movements in artificial microrobots remains a significant challenge.

Purpose of the Study:

  • To introduce a novel laser-based approach for creating highly deformable, untethered light-driven soft microrobots.
  • To enhance microrobot locomotion capabilities and energy efficiency.

Main Methods:

  • Utilized poly(N-isopropylacrylamide)-single-walled carbon nanotubes (PNIPAM-SWNT) hydrogels and a truncated octahedron lattice structure.
  • Employed sequential laser scanning to control microrobot deformation and motion.
  • Designed microrobots with reduced relative density for increased flexibility.

Main Results:

  • Achieved high in situ rotation speed (29.38°/s) and peristaltic locomotion (15.15 μm/s).
  • Demonstrated autonomous programmed motion and navigation through narrow openings (75% of resting width).
  • Showcased significantly improved energy efficiency (1/6th laser energy for 3x speed compared to solid microrobots).

Conclusions:

  • The developed light-driven lattice soft microrobots (LSMR) offer unprecedented control and efficiency.
  • These advancements represent a significant step forward for light-driven soft microrobots.
  • LSMR show great potential for future applications in biomedicine, bionics, and micromechanical engineering.