Bactericidal Activity Study of ZrO₂-Ag₂O Nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Microbiology

Background:

• Bacterial resistance to antibiotics is a growing global health concern.
• Silver nanoparticles (AgNPs) show antibacterial properties but face challenges.
• Developing novel antibacterial agents with improved efficacy is crucial.

Purpose of the Study:

• To synthesize and characterize zirconium oxide (ZrO2), silver oxide (Ag2O), and ZrO2-Ag2O nanoparticles.
• To evaluate the antibacterial activity of these nanoparticles against various bacteria.
• To investigate the role of ZrO2 in enhancing the antibacterial properties of Ag2O.

Main Methods:

• Sol-gel method for nanoparticle synthesis.
• X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Dynamic Light Scattering (DLS), and Fourier Transformed Infrared Spectroscopy (FTIR) for characterization.
• Agar diffusion assay for antibacterial activity testing.

Main Results:

• Monoclinic ZrO2, cubic Ag2O, and mixed ZrO2-Ag2O phases were confirmed by XRD.
• Spherical nanoparticles were observed via SEM, with DLS indicating sizes of 76 nm (ZrO2), 50 nm (Ag2O), and 14-42 nm (ZrO2-Ag2O).
• ZrO2-Ag2O nanoparticles exhibited significantly enhanced antibacterial activity against all tested bacteria (Bacillus subtilis, Streptococcus mutans, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, Klebsiella oxytoca) compared to pure ZrO2 and Ag2O.

Conclusions:

• ZrO2-Ag2O nanoparticles represent a promising antibacterial agent with superior efficacy.
• The enhanced activity is attributed to the chemical stability provided by ZrO2, as indicated by zeta potential measurements.
• This study offers a potential solution to combat antibiotic resistance through novel nanomaterials.