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Related Experiment Video

Updated: May 19, 2026

An Additive Manufacturing Technique for the Facile and Rapid Fabrication of Hydrogel-based Micromachines with Magnetically Responsive Components
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Hydrogel microrobots actuated by optically generated vapour bubbles.

Wenqi Hu1, Kelly S Ishii, Qihui Fan

  • 1Dept. of Electrical Engineering, University of Hawaii at Manoa, Holmes Hall 483, 2540 Dole Street, Honolulu, USA.

Lab on a Chip
|August 18, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel hydrogel microrobot for precise manipulation. This optothermally actuated device assembles microparticles and cells into patterns, demonstrating potential for microscale engineering and cell culture applications.

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Area of Science:

  • Biomedical Engineering
  • Micro-robotics
  • Materials Science

Background:

  • Microrobots offer precise control for microscale manipulation.
  • Optothermal actuation provides a non-contact method for microrobot control.
  • Hydrogel-based microrobots are biocompatible and versatile.

Purpose of the Study:

  • To develop and characterize a novel hydrogel microrobot for microscale assembly.
  • To demonstrate optothermal actuation of the microrobot using laser-induced bubbles.
  • To investigate the microrobot's capability in assembling microparticles and biological cells.

Main Methods:

  • Fabrication of disk-shaped microrobots from poly(ethylene glycol) diacrylate (PEGDA).
  • Optothermal actuation using a pulsed laser to generate bubbles for propulsion.
  • Controlled manipulation of single or paired microrobots to assemble 20-μm polystyrene beads, yeast cells, and cell-laden microgels into patterns.

Main Results:

  • The PEGDA microrobot was successfully fabricated and actuated optothermally.
  • Smooth actuation of the 80-μm microrobot was achieved at speeds up to 320 μm s(-1).
  • Precise assembly of microparticles and biological samples into various patterns was demonstrated.

Conclusions:

  • The developed hydrogel microrobot is an effective tool for microscale assembly tasks.
  • Optothermal actuation offers precise and efficient control over microrobot movement.
  • The microrobots successfully patterned yeast cells and microgels, which were viable and proliferated post-assembly, indicating potential for bio-applications.