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    Photocatalytic antibacterial performance of Sn4+-doped TiO2 thin films on glass substrate
    (Elsevier, 2009) Sayilkan, Funda; Asilturk, Meltem; Kiraz, Nadir; Burunkaya, Esin; Arpac, Ertugrul; Sayilkan, Hikmet
    Pure anatase, nanosized and Sn4+ ion doped titanium dioxide (TiO2) particulates (TiO2-Sn4+) were synthesized by hydrothermal process. TiO2-Sn4+ was used to coat glass surfaces to investigate the photocatalytic antibacterial effect of Sn4+ doping to TiO2 against gram negative Escherichia coli (E. coli) and gram positive Staphylococcus aureus (S. aureus). Relationship between solid ratio of TiO2-Sn4+ in coatings and antibacterial activity was reported. The particulates and the films were characterized using particle size analyzer, zeta potential analyzer, Brunauer-Emmett-Teller (BET), X-ray diffractometer (XRD), SEM, AAS and UV/VIS/NIR techniques. The results showed that TiO2-Sn4+ is fully anatase crystalline form and easily dispersed in water. Increasing the solid ratio of TiO2-Sn4+ from 10 to 50% in the coating solution increased antibacterial effect. (C) 2008 Elsevier B.V. All rights reserved.
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    Photocatalytic degradation of Congo Red by hydrothermally synthesized nanocrystalline TiO2 and identification of degradation products by LC-MS
    (Elsevier, 2008) Erdemoglu, Sema; Aksu, Songuel Karaaslan; Sayilkan, Funda; Izgi, Belgin; Asilturk, Meltem; Sayilkan, Hikmet; Frimmel, Fritz
    Degradation of Congo Red (CR) dye in aqueous solutions was investigated by means of photocatalysis of TiO2 which was hydrothermally synthesized at 200 degrees C in 2 h, in anatase phase with 8 nm crystallite size. Efficiency of TiO2 in photocatalytic degradation under visible irradiation was studied by investigating the effects of amount of TiO2, irradiation time, initial CR concentration and pH. It was found that complete decolorization is achieved within 30 min of irradiation. Effects of nitrate and sulphate ions and humic acid on the degradation were also tested. The results were compared with Degussa P-25 TiO2 at the same degradation conditions. Degradation products were detected using LC-MS technique. The probable pathways for the formation of degradation products were proposed. (C) 2008 Published by Elsevier B.V.
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    Siliconcarbide Embedded Hybrid Nanocomposites as Abrasion Resistant Coating
    (Springer, 2010) Arslan, Osman; Arpac, Ertugrul; Sayilkan, Hikmet
    Siliconcarbide (SiC) ceramic powder incorporated inorganic-organic nanocomposites were prepared by sol-gel spin coating method. Coating properties and abrasion resistance of the hybrid polymers were examined by scanning electron microscopy (SEM), EDX analysis, FT-IR spectroscopy, thermogravimetric differential thermal analysis (TG-DTA). Mechanical tests like surface static corrosion analysis, abrasion test, scratch-tape test, adhesion test, chemical and solvent resistance, surface hardness were performed in order to evaluate the coatings for possible industrial applications. Prepared polymers were applied onto the aluminium substrates. Results revealed that industrially available SiC ceramic powder incorporated inorganic-organic nanocomposites can be prepared with an easy and controlled way using sol-gel method and applied onto the aluminium surfaces by spin coating without using primer solution and shows excellent abrasion resistance.