Ceramics-Silikáty 54, (3) 219 - 224 (2010) |
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ANTIBACTERIAL SiO₂–Ag SOL-GEL LAYERS ON FLAT GLASSES |
Hradecká Helena, Matoušek Josef |
Institute of Chemical Technology Prague, Department of Glass and Ceramics
Technická 5, 166 28 Prague, Czech Republic
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Keywords: Sol-gel layers, Silica-silver layers, Antibacterial layers |
Sol-gel method was used to prepare SiO₂ layers with addition of Ag on Float and Fourcault glass substrates. By modifying
procedures described in literature and by optimizing conditions of layers preparation (time of sol ageing, temperature and
time of layers temperature treatment) homogenous layers were obtained, either colorless or with various intensity of yellow
coloring. Quality and homogeneity of the layers were investigated by means of optical microscopy while the color intensity
was evaluated by spectrophotometry. Antibacterial properties of the layers were tested with the use of Escherichia coli
bacteria. The results have shown antibacterial effect of the layers prepared on Float glass substrate. The layers prepared on
the Fourcault glass substrate did not show any antibacterial capability. Chemical changes caused by interaction of the layers
with the glass substrate during thermal treatment are discussed. Also chemical durability of the layers in distilled water was
followed. It was found that the layers are attacked by distilled water (60 °C) after relatively short time of exposition. |
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