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Programmable Auxeticity in Hydrogel Metamaterials via Shape-Morphing Unit Cells.

Oliver Skarsetz1, Viacheslav Slesarenko2, Andreas Walther1,2

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Summary
This summary is machine-generated.

Researchers developed reconfigurable hydrogel metamaterials that can change shape and mechanical properties. This programmable auxeticity allows for tunable Poisson

Keywords:
auxeticshydrogel metamaterialsmechanical metamaterialsshape morphing

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Polymer Science

Background:

  • Mechanical metamaterials exhibit unique properties derived from their structure.
  • Conventional metamaterials lack reconfigurability after manufacturing.

Purpose of the Study:

  • To introduce shape-morphing capabilities into hydrogel metamaterials.
  • To achieve programmable auxeticity through controlled reconfiguration.

Main Methods:

  • Spatio-selective integration of responsive actuating elements into a hydrogel metamaterial.
  • Utilizing thermal control to adjust the unit cell geometry.
  • Finite element (FE) simulation for prediction and verification.

Main Results:

  • Successfully reconfigured the mesoscale unit cell geometry of a honeycomb structure.
  • Achieved programmable auxeticity with Poisson's ratios ranging from negative to positive.
  • Demonstrated precise control over the unit cell angle (68° to 107°) via thermal stimulus.

Conclusions:

  • Shape-morphing hydrogel metamaterials offer a novel strategy for reconfigurable materials.
  • The developed concept extends hydrogel applications in areas like mechanical computing and soft robotics.
  • This approach enables the creation of metamaterials with tunable mechanical responses.