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An Additive Manufacturing Technique for the Facile and Rapid Fabrication of Hydrogel-based Micromachines with Magnetically Responsive Components
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Michell's-Instability-Mediated Fast Reconfiguration of Hydrogel-Based Ring Actuators.

Qing Li Zhu1, Zhijie Li2, Hanlei Cheng1

  • 1Department of Polymer Science and Engineering, Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University, Hangzhou, 310058, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

Researchers developed novel hydrogel ring actuators that rapidly change shape using stimulus-triggered Michell's instability. This breakthrough harnesses mechanical instability for fast-acting soft actuators, opening new avenues for soft robotics.

Keywords:
Michell's instabilityanisotropic gelsfast reconfigurationring actuatorsrotation

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Area of Science:

  • Soft robotics
  • Mechanical engineering
  • Materials science

Background:

  • Michell's instability is a classic mechanical phenomenon in elastic rings, rarely applied to soft actuators.
  • Instability occurs when pre-torsion exceeds a critical value, causing shape transition to a figure-of-eight.
  • Soft actuators typically lack rapid shape-morphing capabilities.

Purpose of the Study:

  • To develop novel hydrogel-based ring actuators utilizing stimulus-triggered Michell's instability.
  • To achieve fast shape morphing in soft actuators through controlled mechanical instability.
  • To explore the potential of Michell's instability in designing advanced soft machines.

Main Methods:

  • Fabrication of hydrogel ring actuators with anisotropic structures.
  • Triggering shape transitions using external stimuli like heating and light irradiation.
  • Conducting experiments and simulations to analyze instability mechanisms and influencing factors.

Main Results:

  • Hydrogel rings rapidly transformed from saddle-shape to figure-of-eight configuration upon heating or light exposure.
  • Stimuli-induced changes in bending and torsional stiffnesses were identified as the mechanism reducing critical twist for instability.
  • Actuators demonstrated fast actions in aqueous conditions, performing tasks like screwing and object manipulation.

Conclusions:

  • Stimulus-triggered Michell's instability provides an effective mechanism for fast-acting soft actuators.
  • The design principle can be applied to develop other soft machines with rapid, large-amplitude shape changes.
  • This work highlights the potential of exploiting mechanical instabilities in soft robotics design.