Role of the Surface Composition and Structure of Titanium(IV) Oxide in the Manifestation of Antimicrobial Properties in Poly-N-vinylamide/Titanium(IV) Oxide Hybrid Materials

Resumo

Hydrolysis of TiOSO₄ · xH₂SO₄ · yH₂O and TiOSO₄ · xH₂O, performed in the presence of poly-N-vinylcaprolactam (PVCL) or poly-N-vinylpyrrolidone (PVP) and in an aqueous medium, has provided for the first time samples containing nanophases of, respectively, η-modification of TiO_2 – x · nH₂O ( intercalates TiO_2 – x · (nH₂O, PVCL) or TiO_2 – x · (nH₂O, PVP)) and with anatase structure (TiO₂). The samples have been characterized by X-ray diffraction and X-ray photoelectron spectroscopy. They are found to have different antimicrobial activities. A relationship is established between the antimicrobial activity and the structural features of titanium(IV) oxide; concentration of hydrated titanium dioxide in the samples; and the content of free water and hydroxyl and \({\text{SO}}_{4}^{{2 - }}\) groups on the surface of anatase and η-phase nanoparticles, respectively. The choice of polymer does not affect the antimicrobial activity.