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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
Summary
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.
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.
