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Robust Hydrogel Adhesion by Harnessing Bioinspired Interfacial Mineralization.

Jun Zhang1, Yaya Wang2, Jiajun Zhang1

  • 1Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 8, 2022
PubMed
Summary

Researchers developed a simple, universal method for robust hydrogel adhesion to diverse surfaces, even when wet. This bioinspired mineralized layer enhances material interfaces for applications like flexible electronics and energy harvesting.

Keywords:
bioinspired materialshydrogelsinterfacesmineralizationrobustness

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Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Flexible Electronics

Background:

  • Hydrogels are crucial for biomedical and flexible electronic applications, requiring strong adhesion to various substrates.
  • Existing hydrogel adhesion methods often lack universality, simplicity, or robustness, especially in wet conditions.

Purpose of the Study:

  • To develop a universal and simple strategy for achieving robust interfacial adhesion between hydrogels and diverse substrates.
  • To investigate the mechanism of adhesion enhancement through a bioinspired mineralized transition layer.

Main Methods:

  • Constructing a bioinspired mineralized transition layer via ion diffusion and mineral deposition.
  • Testing adhesion on various substrates including soft hydrogels, glass, aluminum, PET, nylon, and PDMS under wet conditions.
  • Applying the strategy to single-electrode triboelectric nanogenerators (TENGs).

Main Results:

  • Achieved strong interfacial adhesion between multiple hydrogel types and a wide range of substrates, including rigid solids and soft hydrogels, under wet conditions.
  • The mineralized transition layer strategy proved generally applicable to various substrates and ionic pairs.
  • The method is compatible with different fabrication approaches without compromising interfacial robustness.
  • Demonstrated reliable signal generation in TENG devices due to the robust hydrogel-elastomer interface.

Conclusions:

  • The bioinspired mineralized transition layer offers a universal, simple, and robust method for hydrogel adhesion.
  • This strategy significantly enhances interfacial stability for hydrogel-based devices in demanding environments.
  • The developed adhesion technique holds promise for advancing flexible electronics and energy harvesting technologies.