ntibacterial and Hydrophilic Properties of Tio2 and Tio2-Ag Coatings on Tile Surface: the Influence of Different Ratios

In this study, tiles were coated with TiO2 and TiO2-Ag in different weight percentages by sol-gel and immersing method. The structural characteristics of the samples by XRD and EDS showed the rutile phase of TiO2 and Ag2O3. Microstructural studies using FESEM showed that the grain size decrease d with increasing of titanium dioxide and silver nitrate. The antibacterial properties of the samples with different amounts of silver nitrate and titanium dioxide were investigated by two types of gram-positive bacteria Staphylococcus aureus ATCC 6538 and gram-negative bacteria Escherichia coli ATCC 25922 under visible light. The results showed that the percentage of reduction of S. aureus and E. coli bacteria by TiO2-Ag coatings was 99% and 98%, respectively. The wettability behavior of the coatings was obtained by measuring the contact angle. Doping silver nanoparticles with titanium dioxide reduces the contact angle and the samples behavior changes from hydrophilic to super-hydrophilic.