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Fabrication of PTFE + TiO2/Ag coatings on 316L/polydopamine with advanced mechanical, bio-corrosion, and antibacterial properties for stainless steel Catheters

Sheikhzadeh, M. S ; Sharif University of Technology | 2024

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  1. Type of Document: Article
  2. DOI: 10.1080/09205063.2024.2365047
  3. Publisher: 2024
  4. Abstract:
  5. This study explores the corrosion resistance and antibacterial properties of a PTFE + TiO2/Ag coating applied to 316 L stainless steel. To enhance adhesion, a polydopamine interlayer was chemically deposited onto the steel surface. The PTFE + TiO2 coating was subsequently applied through immersion, followed by the deposition of silver nanoparticles using a chemical method. Optimization of the polydopamine interlayer involved varying temperature, time, stirring speed, and drying parameters. The optimal conditions for the polydopamine interlayer were determined to be 60 °C for 1 h, 300 rpm stirring, and 24-h drying in a freeze dryer. Analytical results demonstrated that both the PTFE + TiO2 and PTFE/PTFE + TiO2/Ag coatings exhibited exceptional corrosion resistance, with corrosion currents of 3.3 × 10−5 and 3.2 × 10−4 μA/cm2, respectively. Antibacterial assessments showcased the remarkable ability of the PTFE/PTFE + TiO2/Ag coating, containing 5% silver content, to effectively inhibit bacterial penetration within a 6.5 mm radius. Furthermore, this coating displayed a water contact angle of 143°, classifying it as a hydrophobic coating. The photocatalytic efficiency (Rs) was determined to be 3.18 × 10−3 A/W, a performance level comparable to that of a standard UV sensor. These findings underscore the substantial enhancements in corrosion resistance, antibacterial performance, and hydrophobic characteristics achieved with the PTFE + TiO2/Ag coating, particularly through the novel optimization of the polydopamine interlayer. This coating exhibits great promise for multifunctional protective applications in diverse fields, particularly demonstrating its suitability for implants and bio-coatings. © 2024 Informa UK Limited, trading as Taylor & Francis Group
  6. Keywords:
  7. Hydrophobic coating ; Silver nanoparticles ; Anti-Bacterial Agents ; Escherichia coli ; Indoles ; Materials Testing ; Mechanical Phenomena ; Metal Nanoparticles ; Stainless Steel ; Surface Properties ; Titanium ; Corrosion resistant coatings ; Hydrophobicity ; Steel corrosion ; TiO2 nanoparticles ; Titanium dioxide ; Dopamine ; Polytetrafluoroethylene ; Titanium dioxide nanoparticle ; Biocompatible coated material ; Indole derivative ; Polydopamine ; 316L ; Antibacterial properties ; Bio-corrosion properties ; Nano-composite coating ; Polydopamine interlayer ; Resistance properties ; Abrasion resistance ; Adhesion ; Atomic force microscopy ; Attenuated total reflectance Fourier transform infrared spectroscopy ; Biocompatibility ; Coating thickness ; Contact angle ; Controlled study ; Dip coating ; Energy dispersive X ray spectroscopy ; Freeze drying ; Hydrophilicity ; Immersion ; In vitro study ; Particle size ; Photocatalysis ; Polarization ; Polymerization ; Sol-gel ; Temperature ; Wettability ; Catheter ; Drug effect ; Staphylococcus aureus
  8. Source: Journal of Biomaterials Science, Polymer Edition ; Volume 35, Issue 13 , 2024 , Pages 2020-2048 ; 09205063 (ISSN)
  9. URL: https://www.tandfonline.com/doi/full/10.1080/09205063.2024.2365047