This work focuses on the photocatalytic performances and antibacterial activity of nitrogen doped TiO 2 nanosystems with three and five layers obtained by a sol-gel route, followed by thermal treatment in oxygen or ammonia atmosphere at temperatures between 400 and 1000°C. Subsequently, the antibacterial activity of the obtained nanosystems on the Escherichia coli cells are determined and discussed. The obtained results show a significant dependence of the functional performances on the system's composition. In particular, the antimicrobial activity of nitrogen-doped TiO 2 films is correlated with the temperature of thermal treatment and illumination time with visible artificial light.
The current work focuses on the effect of silica and titania nanotubes and their synthesis conditions on the potential antibacterial activity. Since most investigations are oriented towards carbon nanotubes, we focused on studying the biological activity of oxide nanotubes obtained under different synthesis and different thermal treatment conditions. The antibacterial activity against Bacillus sphericus, Bacillus subtilis, Escherichia coli and Virgibacillus halodenitrificans were examined by the plate counting method. The biological activity was evaluated as dehydrogenase activity. The results revealed that titania nanotubes exhibit a higher antibacterial activity as compared with silica. This activity could be correlated with differences in the structure and morphology of these two types of nanotubes investigated.
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