Advanced titanium dioxide-polytetrafluorethylene (TiO2-PTFE) nanocomposite coatings on stainless steel surfaces with antibacterial and anti-corrosion properties

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

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Abstract

Bacterial infection and corrosion are two of the most common causes of the failure for the use of biomedical metallic implants. In this paper, we developed a facile two-step approach for synthesizing a TiO2-PTFE nanocomposite coating on stainless steel substrate with both antibacterial and anticorrosion properties by using a sol-gel dip coating technique. A sub-layer of bioinspired polydopamine (PDA) was first coated on the stainless steel substrate to improve the adhesion and reactivity, then TiO2-PTFE was uniformly co-deposited onto the PDA sub-layer. Both PTFE and TiO2 contents had a significant influence on the surface energy of the TiO2-PTFE coating. The coating with the total surface energy of 26 mJ/m2 exhibited minimal bacterial adhesion against both Gram-negative Escherichia coli WT F1693 and Gram-positive Staphylococcus aureus F1557, which was explained using the extended DLVO theory. Benefiting from the synergistic effect between TiO2 and PTFE, the TiO2-PTFE coating showed improved corrosion resistance in artificial body fluids compared with the sole TiO2 coating or PTFE coating. The TiO2-PTFE coating also demonstrated extraordinary biocompatibility with fibroblast cells in culture, making it a prospective strategy to overcome current challenges in the use of metallic implants.
Original languageEnglish
Pages (from-to)231-241
Number of pages11
JournalApplied Surface Science
Volume490
Early online date8 Jun 2019
DOIs
Publication statusPublished - 1 Oct 2019

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Stainless Steel
Polytetrafluoroethylene
Polytetrafluoroethylenes
titanium oxides
Titanium dioxide
stainless steels
Nanocomposites
corrosion
nanocomposites
Stainless steel
Corrosion
coatings
Coatings
surface energy
Interfacial energy
adhesion
Adhesion
body fluids
staphylococcus
fibroblasts

Keywords

  • Titanium dioxide
  • Polytetrafluoroethylene
  • Surface energy
  • Antibacterial activity
  • Corrosion

Cite this

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title = "Advanced titanium dioxide-polytetrafluorethylene (TiO2-PTFE) nanocomposite coatings on stainless steel surfaces with antibacterial and anti-corrosion properties",
abstract = "Bacterial infection and corrosion are two of the most common causes of the failure for the use of biomedical metallic implants. In this paper, we developed a facile two-step approach for synthesizing a TiO2-PTFE nanocomposite coating on stainless steel substrate with both antibacterial and anticorrosion properties by using a sol-gel dip coating technique. A sub-layer of bioinspired polydopamine (PDA) was first coated on the stainless steel substrate to improve the adhesion and reactivity, then TiO2-PTFE was uniformly co-deposited onto the PDA sub-layer. Both PTFE and TiO2 contents had a significant influence on the surface energy of the TiO2-PTFE coating. The coating with the total surface energy of 26 mJ/m2 exhibited minimal bacterial adhesion against both Gram-negative Escherichia coli WT F1693 and Gram-positive Staphylococcus aureus F1557, which was explained using the extended DLVO theory. Benefiting from the synergistic effect between TiO2 and PTFE, the TiO2-PTFE coating showed improved corrosion resistance in artificial body fluids compared with the sole TiO2 coating or PTFE coating. The TiO2-PTFE coating also demonstrated extraordinary biocompatibility with fibroblast cells in culture, making it a prospective strategy to overcome current challenges in the use of metallic implants.",
keywords = "Titanium dioxide, Polytetrafluoroethylene, Surface energy, Antibacterial activity, Corrosion",
author = "Shuai Zhang and Xinjin Liang and Gadd, {Geoffrey Michael} and Qi Zhao",
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T1 - Advanced titanium dioxide-polytetrafluorethylene (TiO2-PTFE) nanocomposite coatings on stainless steel surfaces with antibacterial and anti-corrosion properties

AU - Zhang, Shuai

AU - Liang, Xinjin

AU - Gadd, Geoffrey Michael

AU - Zhao, Qi

PY - 2019/10/1

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N2 - Bacterial infection and corrosion are two of the most common causes of the failure for the use of biomedical metallic implants. In this paper, we developed a facile two-step approach for synthesizing a TiO2-PTFE nanocomposite coating on stainless steel substrate with both antibacterial and anticorrosion properties by using a sol-gel dip coating technique. A sub-layer of bioinspired polydopamine (PDA) was first coated on the stainless steel substrate to improve the adhesion and reactivity, then TiO2-PTFE was uniformly co-deposited onto the PDA sub-layer. Both PTFE and TiO2 contents had a significant influence on the surface energy of the TiO2-PTFE coating. The coating with the total surface energy of 26 mJ/m2 exhibited minimal bacterial adhesion against both Gram-negative Escherichia coli WT F1693 and Gram-positive Staphylococcus aureus F1557, which was explained using the extended DLVO theory. Benefiting from the synergistic effect between TiO2 and PTFE, the TiO2-PTFE coating showed improved corrosion resistance in artificial body fluids compared with the sole TiO2 coating or PTFE coating. The TiO2-PTFE coating also demonstrated extraordinary biocompatibility with fibroblast cells in culture, making it a prospective strategy to overcome current challenges in the use of metallic implants.

AB - Bacterial infection and corrosion are two of the most common causes of the failure for the use of biomedical metallic implants. In this paper, we developed a facile two-step approach for synthesizing a TiO2-PTFE nanocomposite coating on stainless steel substrate with both antibacterial and anticorrosion properties by using a sol-gel dip coating technique. A sub-layer of bioinspired polydopamine (PDA) was first coated on the stainless steel substrate to improve the adhesion and reactivity, then TiO2-PTFE was uniformly co-deposited onto the PDA sub-layer. Both PTFE and TiO2 contents had a significant influence on the surface energy of the TiO2-PTFE coating. The coating with the total surface energy of 26 mJ/m2 exhibited minimal bacterial adhesion against both Gram-negative Escherichia coli WT F1693 and Gram-positive Staphylococcus aureus F1557, which was explained using the extended DLVO theory. Benefiting from the synergistic effect between TiO2 and PTFE, the TiO2-PTFE coating showed improved corrosion resistance in artificial body fluids compared with the sole TiO2 coating or PTFE coating. The TiO2-PTFE coating also demonstrated extraordinary biocompatibility with fibroblast cells in culture, making it a prospective strategy to overcome current challenges in the use of metallic implants.

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