Silver-enriched microdomain patterns as advanced bactericidal coatings for polymer-based medical devices

Area of Science:

• Biomaterials Science
• Nanotechnology
• Surface Engineering

Background:

• Polymers are crucial in medicine, with expanding applications.
• Silver nanoparticles (AgNPs) possess antibacterial properties but can exhibit toxicity.
• Developing safe and effective antibacterial materials is essential for biomedical applications.

Purpose of the Study:

• To create hexagonal domains doped with silver nanoparticles (AgNPs) on polyetheretherketone (PEEK) surfaces using laser ablation.
• To evaluate the antibacterial efficacy of the Ag-doped PEEK composites against common pathogens.
• To assess the cytotoxicity of the Ag-doped PEEK composites.

Main Methods:

• Fabrication of hexagonal domains on PEEK using a KrF excimer laser (248 nm) and a grid.
• Surface characterization using Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM).
• Surface chemistry analysis via X-ray Photoelectron Spectroscopy (XPS).
• Quantification of released silver ions (Ag+) using Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
• Antibacterial efficacy testing against Escherichia coli and Staphylococcus aureus.
• Cytotoxicity assessment.

Main Results:

• Successfully formed hexagonal domains doped with AgNPs on the PEEK surface.
• Demonstrated significant antibacterial activity of Ag-doped PEEK against E. coli and S. aureus.
• Confirmed the release of Ag+ ions from the composite material.
• Cytotoxicity tests indicated a favorable safety profile.

Conclusions:

• Laser-based fabrication of AgNP-doped PEEK offers a promising method for creating effective antibacterial biomaterials.
• The developed Ag-doped PEEK composites present a novel strategy for combating bacterial infections in biomedical settings.
• This approach balances potent antibacterial action with acceptable cytotoxicity, advancing materials design for medical applications.