Dual-functional anti-biofouling coatings with intrinsic self-healing ability
CHEMICAL ENGINEERING JOURNAL(2020)
摘要
The colonization of microbe on the material surface causes serious damage to the fields of biomedicine, water purification, and biosensors, and therefore versatile and biocompatible anti-biofouling coatings are highly demanded. Here, we fabricated a dual-functional (fouling-resist and antibacterial properties) anti-biofouling selfhealing coating (DASC) with the triplex-crosslinked network (the covalent bonds, hydrogen bonds, and ionic interactions), which could be coated on 316L stainless steel substrate and demonstrated strong adhesive strength. The DASC-15 (the quaternary ammonium compounds accounts for 15 mol%) could inhibit the adhesion of biofouling due to its hydroxyethyl acrylate (HEA) and poly(ethylene glycol) methyl ether acrylate (PEGA(480)) units, and its anti-protein adhesion efficiency reached 90%. The presence of the quaternary ammonium compounds cations endowed the DASC-15 with excellent broad-spectrum antibacterial property, and the killing efficiency against Staphylococcus aureus and Escherichia coll. was approximately 99.9%. Moreover, The DASC-15 could be repaired within 15 min under ambient condition after being scratched. The mechanical property restored to 93% of its original condition, which was derived from the destruction and recombination of the supramolecular non-covalent bonds. More prominently, larger scratches with the width of 200 mu m could be repaired and the anti-biofouling property remained at the humidity of 90%. The coating is promising for biomaterial due to its strong metal adhesion, good biocompatibility, excellent anti-biofouling and outstanding self-healing properties.
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关键词
Anti-fouling,Antibacterial activity,Self-healing,Surface coating
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