Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1789082 | Current Applied Physics | 2009 | 5 Pages |
Abstract
Bactericidal activity of high concentration Ag nanoparticles immobilized on surface of an aqueous sol-gel silica thin film was investigated against Escherichia coli and Staphylococcus aureus bacteria. Size of the surface nanoparticles was estimated in the range of 35-80Â nm by using atomic force microscopy. Due to accumulation of the silver nanoparticles at near the surface (at depth of 6Â nm and about 40 times greater than the silver concentration in the sol), the synthesized Ag-SiO2 thin film (with area of 10Â mm2) presented strong antibacterial activities against E. coli and S. aureus bacteria with relative rate of reduction of the viable bacteria of 1.05 and 0.73Â hâ1 for initial concentration of about 105Â cfu/ml, respectively. In addition, the dominant mechanism of silver release in long times was determined based on water diffusion in surface pores of the silica film, unlike the usual diffusion of water on the surface of silver-based bulk materials. Therefore, the Ag nanoparticles embedded near the surface of the SiO2 thin film can be utilized in various antibacterial applications with a strong and long life activity.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
O. Akhavan, E. Ghaderi,