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Selectively Detachable Hydrogel Adhesion Enabled by Stimulus-Specific Cleavable Cross-Linkers.

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  • 1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

ACS Applied Materials & Interfaces
|November 20, 2024
PubMed
Summary

Researchers developed detachable hydrogel adhesion using two independent triggers: chemical reduction for N,N'-bis(acryloyl)cystamine (BAC) and heating for N,N'-(1,2-dihydroxyethylene)bis(acrylamide) (DHEBA). This enables selective detachment for advanced soft electronics and bioengineering applications.

Keywords:
cleavable cross-linkerdetachable hydrogel adhesionhydrogelhydrogel logic gatesselective-release capsule

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Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Polymer Chemistry

Background:

  • Detachable hydrogel adhesion is crucial for soft electronics and bioengineering.
  • Conventional methods with single detachment triggers limit independent control and risk unintentional release.
  • Integrating multiple triggers requires careful consideration of environmental compatibility.

Purpose of the Study:

  • To develop a strategy for selective detachable adhesion using two independent cleavage triggers.
  • To demonstrate the versatility and programmability of this approach in hydrogel networks.
  • To explore applications in logic gates and controlled release systems.

Main Methods:

  • Utilized two cleavable cross-linkers: N,N '-bis(acryloyl)cystamine (BAC) for reduction and N,N '-(1,2-dihydroxyethylene)bis(acrylamide) (DHEBA) for hydrolysis.
  • Constructed stitching polymer networks with independent degradation pathways.
  • Investigated adhesion properties on various substrates and designed hydrogel-based logic gates and release capsules.

Main Results:

  • Achieved selective detachment in hydrogels via independent triggers (reduction or heating).
  • Demonstrated high adhesion energy (up to 1223 J m-2) in polyacrylamide-alginate hydrogels.
  • Showcased versatile adhesion to diverse substrates (Al, Cu, glass, PET) and programmable functions like logic gates and dual-release capsules.

Conclusions:

  • The developed strategy enables selective and programmable detachable adhesion in hydrogels.
  • This approach offers enhanced control and functionality for advanced soft materials.
  • Potential applications span soft electronics, bioengineering, and responsive material systems.