Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 15, Pages 5625-5632Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b01498
Keywords
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Funding
- National Key Research and Development Program of China [2016YFB0700800]
- R&D Program in Key Areas of Guangdong [2019B010941002]
- NSFC [81671824, 31700841]
- Fundamental Research Funds for the Central Universities [2682019JQ03]
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Tough and conductive hydrogels are the promising materials for various applications. However, fabrication of these hydrogels at room or low temperatures, without external stimuli, is a challenge. Herein, a novel dual self-catalytic system composed of a variety of metal ions and catechol-based molecules was developed to efficiently trigger the free-radical polymerization of tough, conductive, transparent, and self-healing hydrogels at low temperature without any external stimuli. Ferric ions (Fe3+) and dopamine (DA) were chosen as model compounds, which form stable redox pairs that act as a dual self-catalytic system to activate ammonium persulfate to generate free radicals. Consequently, the radicals could rapidly trigger the hydrogel self-gelation at low temperatures (6 degrees C) within 5 s. The dual self-catalytic system opens up a facile route to synthesize multifunctional hydrogels at mild conditions for a broad range of applications, especially in tissue engineering and wearable electronics.
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