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Electrically Programmable Interfacial Adhesion for Ultrastrong Hydrogel Bonding.

Yaqian Liu1,2,3, Pudi Wang2,4, Xing Su2,4

  • 1College of Science, Inner Mongolia University of Technology, Hohhot, 010051, China.

Advanced Materials (Deerfield Beach, Fla.)
|February 1, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces an electroadhesion method for strong, adjustable hydrogel bonding. Using an ionic hydrogel and electric fields, it enables programmable adhesion strength for diverse applications.

Keywords:
adhesive hydrogelsinterfacial electroadhesionion diffusionmechanoelectric coupling

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Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Chemistry

Background:

  • Adjustable interfacial adhesion is crucial for smart hydrogel applications.
  • Existing methods for hydrogel bonding often lack programmability or universality.

Purpose of the Study:

  • To develop a universal and ultrastrong hydrogel bonding strategy with electrically programmable adhesion strength.
  • To investigate the mechanism of electroadhesion in ionic hydrogels.

Main Methods:

  • Design of an ionic hydrogel containing lithium ions for hydrated-ion-diffusion-mediated adhesion.
  • Application of external electric fields to control ion diffusion across the ionic adhesion region (IAR).
  • Characterization of adhesion strength, toughness, and environmental tolerance.

Main Results:

  • Achieved universal, ultrastrong, efficient, tough, reversible, and environmentally tolerant electroadhesion to diverse hydrogels.
  • Demonstrated peak adhesion strength of 1.2 MPa and interfacial adhesion toughness of 3750 J m-2.
  • Quantitatively revealed the role of hydrated ions in IAR using a mechanoelectric coupling model.

Conclusions:

  • The proposed electroadhesion strategy offers electrically programmable functions for high-performance hydrogel adhesion.
  • This method is suitable for emerging fields like flexible electronics and soft robotics.
  • The study provides a new avenue for designing advanced adhesive hydrogels.