Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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  • Article
    Citation - WoS: 32
    Citation - Scopus: 33
    Variation of Structural and Optical Properties of Tio2 Films Prepared by Dc Magnetron Sputtering Method With Annealing Temperature
    (Elsevier Ltd., 2020) Gürakar, Sibel; Horzum, Şeyda; Ot, Hakan; Horzum, Şeyda; Serin, Tülay; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    TiO2 thin films are deposited by direct current magnetron sputtering method on the silicon and quartz substrates. The effect of annealing temperature on the film properties are analysed by using X-ray diffraction (XRD), Raman scattering, atomic force microscopy (AFM), scanning electron microscopy (SEM) and optical spectroscopy measurements. Raman and XRD results reveal that the crystal structure of the TiO2 film is strongly affected by the annealing temperature. The crystal structure of the coated film is changed from amorphous to anatase structure after annealing at 500 degrees C. Anatase and rutile phases of TiO2 start to coexist after annealing at 800 degrees C. Rutile phases of TiO2 become dominant for film annealed at 900 degrees C. SEM and AFM images uncover that the morphology, grain size and surface roughness of TiO2 films vary with the annealing temperature. The optical band gap decreases from 3.35 to 2.90 eV as the phase transforms from amorphous to rutile.
  • Article
    Citation - WoS: 20
    Citation - Scopus: 22
    Photocatalytic Antimicrobial Effect of Tio2 Anatase Thin-Film–coated Orthodontic Arch Wires on 3 Oral Pathogens
    (TUBITAK, 2014) Özyıldız, Figen; Güden, Mustafa; Hazar, Ayşe Serpil; Güden, Mustafa; Ölmez, Sultan; Aras, Işıl; Karaboz, İsmail; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The aim of this study was to introduce antimicrobial activity to stainless steel orthodontic arch wires by coating them with TiO2 in anatase form. Stainless steel (0.016 × 0.022 inch), D-rect (0.016 × 0.022 inch), and multistranded hammered retainer wires (0.014 × 0.018 inch) were coated with TiO2 anatase by the sol-gel dip coating method. The wires were assessed for their photocatalytic antimicrobial activity against Streptococcus mutans, Candida albicans, and Enterococcus faecalis. After illumination under UVA (315– 400 nm) at 1.0 mW/cm2 for 1 h, the reduction efficiencies of the anatase-coated arch wires were calculated by using colony-forming unit counts. All anatase-coated arch wires showed remarkable inhibitor effects against the test microorganisms under UVA. The most efficient wire on S. mutans was the stainless steel wire, with a 99.99% reduction in growth, but multistranded hammered retainer wire was the most active against both C. albicans and E. faecalis, with 98.0% and 91.68% reduction rates, respectively. TiO2-coated arch wires exposed to UVA illumination showed significant antimicrobial activity when compared with uncoated samples and coated, but not UVA-exposed, samples. Our results suggest that the antimicrobial effect of TiO2-coated arch wires in long-lasting orthodontic treatments would be beneficial for the prophylaxis of caries.