Toward bioactive yet antibacterial surfaces

Area of Science:

• Biomaterials Science
• Nanotechnology
• Surface Chemistry
• Cell Biology

Background:

• Developing antibacterial, biocompatible, and bioactive surfaces remains a significant challenge in biomedical engineering.
• Existing materials often fail to balance potent antimicrobial properties with favorable cellular interactions.
• Silver (Ag) is a promising element for antimicrobial applications, but its optimal integration into composite materials needs further investigation.

Purpose of the Study:

• To determine the ideal Ag concentration and agglomeration state within bioactive TiCaPCON nanocomposite films.
• To achieve strong bactericidal effects without compromising material biocompatibility and bioactivity.
• To investigate the synergistic effects of Ag nanoparticles and Ag+ ions on bacterial inhibition and osteoblast cell behavior.

Main Methods:

• Fabrication of TiCaPCON films using magnetron sputtering with subsequent Ag+ ion implantation or co-sputtering with Ag.
• Surface characterization including morphology, chemical composition, roughness, and wettability analysis.
• Evaluation of Ag+ ion release, antibacterial/antifungal activity against Escherichia coli and Neurospora crassa, and osteoblast (MC3T3-E1) cell response (adhesion, proliferation, differentiation).

Main Results:

• Optimized Ag content and agglomeration in TiCaPCON films demonstrated high efficacy against E. coli.
• The developed surfaces supported excellent osteoblastic cell adhesion, spreading, proliferation, and differentiation.
• Characterization confirmed the influence of Ag+ ions and nanoparticles on both bacterial inhibition and cellular responses.

Conclusions:

• Ag-doped TiCaPCON nanocomposite films offer a promising solution for creating multifunctional surfaces.
• The study successfully established optimal conditions for Ag integration, balancing potent antibacterial activity with enhanced biocompatibility and bioactivity.
• These findings suggest potential applications in orthopedic and dental implants where infection prevention and bone integration are crucial.