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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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A Light-Driven Microgel Rotor.

Hang Zhang1, Lyndon Koens2, Eric Lauga3

  • 1DWI Leibniz-Institute for Interactive Materials, RWTH Aachen University, Forckenbeckstr. 50, D-52056, Aachen, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|September 26, 2019
PubMed
Summary
This summary is machine-generated.

Researchers designed a 2D spiral microswimmer using a thermoresponsive hydrogel and gold nanorods. This soft microrobot achieves rotation through controlled shape deformations, opening new avenues in microfluidics.

Keywords:
Stokes flowmicrogelsmicroswimmersout-of-equilibriumphotothermal actuationrotational motion

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Area of Science:

  • Soft robotics
  • Microfluidics
  • Biomimicry

Background:

  • Microorganisms exhibit motility via body shape changes, inspiring micro-robotic designs.
  • Understanding microscale fluid dynamics is crucial for developing micro-robots.

Purpose of the Study:

  • To design and demonstrate a novel 2D spiral microswimmer capable of rotational motion.
  • To utilize non-reciprocal curling deformations for micro-scale locomotion.

Main Methods:

  • Fabrication of a microswimmer from a thermoresponsive hydrogel bilayer with embedded plasmonic gold nanorods.
  • Employing local photothermal heating for nonreciprocal bending deformations.
  • Tethering the spiral to a microsphere for rotational motion under stroboscopic irradiation.

Main Results:

  • The spiral demonstrated tunable low stiffness, enabling large deformations.
  • Achieved rotational motion of the microswimmer via controlled shape changes.
  • Estimated rotor efficiency using resistive force theory for Stokes flow.

Conclusions:

  • The spiral microswimmer effectively utilizes shape deformation for microscopic locomotion.
  • This research offers potential applications in microfluidics and soft microrobotics.