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    Hydrothermal synthesis and characterization of vanadium-doped titanium dioxide nanotubes
    (Springer, 2020) Aydin, M. Turkay Aytekin; Hoşgün, Halit Levent
    Undoped and vanadium (V)-doped titanium dioxide nanotubes (TNTs and VTNTs, respectively) were synthesized by hydrothermal method for biological applications. The fabricated nanotubes were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Raman spectroscopy, nitrogen adsorption-desorption isotherms, transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The XRD and vibrational spectra results showed as-prepared nanotubes were complete anatase phase. The characterization of the morphology of the as-obtained nanotubes reveals that the samples are tubular in shape and the starting spherical titanium particles were fully transformed into a tubular material. The TEM and SEM results are in good agreement with XRD, FT-IR, and Raman analysis. The purpose of this study is to produce and characterize the vanadium-doped titanium dioxide nanotubes, such that this material can be employed for biomedical applications. TEM and SEM findings cleared that vanadium doping does not affect significantly the structure of titanium dioxide nanotubes which are uniform and compact.
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    Starch consolidation of SiC ceramics: processing and low-temperature sintering in an air atmosphere
    (Taylor & Francis Ltd, 2020) Kalemtaş, Ayşe; Topates, Gulsum; Aydin, M. Turkay Aytekin; Ozey, Nigar
    Highly porous SiC ceramics containing borax decahydrate were produced by a starch consolidation method in which corn starch was used as a shaping and pore-forming additive. Four different compositions were prepared with different SiC:borax decahydrate ratios and corn starch content. Mixtures with a solid ratio of 55 wt.% were cast in non-porous molds and heated at 80 degrees C for shaping. The starch consolidation technique enabled the shaping of SiC ceramics with different forms and sizes. Simultaneous thermogravimetry and differential thermal analysis of the SiC-borax decahydrate mixture showed that melting took place at below 600 degrees C, as a result of which sintering was carried out at the relatively low temperature, of 600 degrees C in the air using borax decahydrate as a sintering additive. Phase analysis showed that oxidation of SiC did not take place, since no cristobalite phase was detected. Density measurement and mercury porosimetry studies showed that highly porous (70-89% porosity) SiC ceramics with pore size values ranging from 14 to 18 mu m were produced. SEM microstructures of each composition revealed that a strong neck had been formed between the SiC particles in spite of the low sintering temperature.
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    Synthesis, characterization and antibacterial activity of silver-doped TiO2 nanotubes
    (Pergamon-Elsevier Science Ltd, 2018) Aydin, M. Turkay Aytekin; Hoşgün, Halit Levent; Dede, Alper; Guven, Kiymet
    One-dimensional titanium dioxide (TiO2) nanotubes (TNTs) doped with silver (Ag) (% 5) were synthesized via two-step hydrothermal method. These nanotubes were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The impact of Ag-doped TiO2 nanotubes as antibacterial agents against three strains of Gram positive Staphylococcus aureus and a strain of Gram negative Escherichia coli was also investigated. XRD, FT-IR and Raman spectroscopy results showed that nanotubes were complete anatase phase. The potential biocidal effect of nanotubes to different S. aureus strains and E. coli was obtained. (C) 2018 Elsevier B.V. All rights reserved.
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    Synthesis, characterization and photocatalytic activity of boron-doped titanium dioxide nanotubes
    (Elsevier Science Bv, 2019) Hoşgün, Halit Levent; Aydin, M. Turkay Aytekin
    Two-step hydrothermal method was used to prepare undoped and boron-doped one-dimensional titanium dioxide (TiO2) nanotubes. Structural properties, thermal stability and microstructural features of the fabricated undoped titanium dioxide nanotubes (TNTs) and boron-doped titanium dioxide nanotubes (BTNTs) were characterized by X-ray diffraction, Raman, Fourier transform infrared spectroscopy, nitrogen adsorption-desorption isotherms, scanning and transmission electron microscopy techniques. The photocatalytic activity of the fabricated nanotubes was evaluated by using methylene blue degradation. Boron addition to the titanium dioxide nanotubes up to 5% increased the photocatalytic methylene blue degradation efficiency. The achieved highest degradation efficiency was 81% and it was determined that higher (>5%) boron doped into the titanium dioxide nanotubes resulted in a decreased degradation efficiency. (C) 2018 Elsevier B.V. All rights reserved.