Journal
ADVANCED MATERIALS
Volume 31, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201904732
Keywords
hydrogels; on-demand debonding; stimuli-responsive; surface modification; tough bonding
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Funding
- China Postdoctoral Science Foundation [L1190440]
- National Key R&D Program of China [2017YFC11050003]
- Pearl River Talents Scheme [2016ZT06C322]
- National Natural Science Foundation of China [21774038, 91856128]
- Fundamental Research Funds for the Central Universities [2019XX05]
- Brigham Research Institute
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Hybrid systems of hydrogels and metals with tough bonding may find widespread applications. Here, a simple and universal method to obtain strong adhesion between hydrogels and diverse metal surfaces, such as titanium, steel, nickel, tantalum, argentum, and aluminum, with adhesion energy up to >1000 J m(-2) is reported. To achieve such, the metal surfaces are instantly modified with a linker molecule via soaking, dip-coating, or drop-casting. The designed linker molecule has a carboxylic acid group to bind with a metal surface, and a methacrylic group to crosslink with a hydrogel, thus bridging the interface between them. In addition, by introducing a stimulus-responsive disulfide bond into the linker molecule, the on-demand debonding between toughly bonded hydrogel and metal surface, which is enabled by reductive cleavage of the disulfide chemical linkage, is also demonstrated. More interestingly, after the reductive debonding, the resulting metal surface with free thiol groups can be easily rebonded with a second hydrogel without any further surface modification. The strategy may provide unique opportunities in designing hybrid devices that are suitable for complex and dynamic environments.
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