A sol-gel based silver nanoparticle/polytetrafluorethylene (AgNP/PTFE) coating with enhanced antibacterial and anti-corrosive properties

Shuai Zhang, Xinjin Liang, Geoffrey Michael Gadd , Qi Zhao (Lead / Corresponding author)

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Abstract

In this research, a silver nanoparticle/polytetrafluorethylene (AgNP/PTFE) coating for metallic implants was fabricated using a facile layer-by-layer coating method. PTFE nanoparticles were immobilized in a sol-gel matrix and dip-coated onto 316L stainless steel via a mussel-inspired approach followed by AgNP deposition. Benefiting from the synergistic effect of antibacterial AgNP and non-stick PTFE, the AgNP/PTFE coating exhibited superior antibiofilm activity against Escherichia coli WT F1693 and enhanced corrosion resistance. Compared with surfaces only coated with PTFE, the AgNP/PTFE coated surfaces were capable of sustained release of silver ions, inhibiting up to ∼50% bacterial biomass accumulation after 7 days. To understand the anti-adhesion mechanism, both classic DLVO and XDLVO theories were used to model and explain bacterial adhesion. Despite concerns that an over-release of silver ions may cause toxic effects towards mammalian cells, the coating procedures offered ease of control over the silver loading, making it potentially useful for preventing metallic implant-associated infections.

Original languageEnglish
Article number147675
Number of pages10
JournalApplied Surface Science
Volume535
Early online date29 Aug 2020
DOIs
Publication statusE-pub ahead of print - 29 Aug 2020

Keywords

  • silver
  • polytetrafluoroethylene
  • biofilm
  • antibacterial activity
  • corrosion
  • Silver
  • Polytetrafluoroethylene
  • Corrosion
  • Biofilm
  • Antibacterial activity

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