Copper ions-mediated dynamic redox-responsive microgels synergize with silicone for efficient and sustainable antibacterial properties

The antifouling of marine facilities placed below the waterline is a key constraint to the development of the marine economy. Currently, commercial Cu 2 O-based antifouling coatings still have defects such as agglomeration, oxidation, short duration and high dosage. For this reason, we developed for the first time a triple antifouling system consisting of Cu 2 O@poly(NIPAM-co-DAm) (Cu 2 O@PND) dynamic redox microgels triggered by copper ions and polydimethylsiloxane (PDMS). The catechol groups of PND nanogels can chelate Cu 2+ and reduce it in situ to obtain Cu 2 O@PND microgels, which guarantees the stable release of Cu + . Furthermore, Cu 2 O remains stable and free from oxidation because of the electron transfer between PND and Cu 2+ . Finally, superior antifouling performance was achieved by combining the stable Cu + released from Cu 2 O, in situ conversion of PND to hydrogel, and its oxidation to produce active substances and H 2 O 2 , and PDMS coating with low surface energy.