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Programmable and Reversible 3D-/4D-Shape-Morphing Hydrogels with Precisely Defined Ion Coordination.

Zuxiang Xu1,2, Jun Fu1

  • 1School of Materials Science and Engineering, Sun Yat-sen University, 135 Xingang Road West, Guangzhou 510275, China.

ACS Applied Materials & Interfaces
|May 19, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed programmable 3D/4D hydrogel deformations using patterned iron (Fe3+) cross-linking. This ionoprinting technique enables precise control over shape, stiffness, and thermoresponsiveness for advanced applications.

Keywords:
3D/4D morphingactuationion cross-linkingorigamiresponsive hydrogels

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Bionics

Background:

  • Controlling reversible hydrogel deformations is crucial for bionic applications.
  • Developing programmable 3D/4D shape-changing materials remains a challenge.

Purpose of the Study:

  • To achieve programmable three-dimensional (3D) deformations and thermoresponsive actuation of polymer hydrogels.
  • To explore the use of patterned ion cross-linking for precise material control.

Main Methods:

  • Utilized ionoprinting with a patterned electrode array to infiltrate Fe3+ ions into hydrogels.
  • Created periodic patterns of Fe3+ cross-linking to control local network properties.
  • Leveraged differential thermoresponsiveness to induce 4D shape changes.

Main Results:

  • Patterned Fe3+ cross-linking generated undulations in cross-link density, stiffness, and thermoresponsiveness.
  • Induced internal stress resulted in 3D helical structures with tunable chirality and dimensions.
  • Achieved sequential ionoprinting for in-plane control, leading to 3D/4D umbrella-like origami upon temperature triggers.

Conclusions:

  • Demonstrated a method for programmable 3D/4D hydrogel deformations via patterned ion cross-linking.
  • The technique allows for precise control over material properties and complex shape transformations.
  • Highlights potential for advanced actuators and responsive materials in bionics.