Yazar "Ercan, Ismail" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • Küçük Resim Yok
    Öğe
    The effects of Mn and/or Ni dopants on the in vitro/in vivo performance, structural and magnetic properties of ?-tricalcium phosphate bioceramics
    (Elsevier Sci Ltd, 2019) Ates, Tankut; Dorozhkin, Sergey, V; Kaygili, Omer; Kom, Mustafa; Ercan, Ismail; Bulut, Niyazi; Firdolas, Fatih
    The present study describes the effects of dopants of Mn and/or Ni on the structural, magnetic and in vivo/in vitro performances of beta-tricalcium phosphate (beta-TCP) bioceramics synthesized by a sol-gel method. Both types of dopants caused significant effects on the structure-related parameters of beta-TCP, including the crystallite dimensions and lattice parameters. The magnetic properties of as-prepared samples were found to be affected by the type and amount of the dopant(s). The in vitro antimicrobial activities of doped beta-TCPs against American Type Culture Collection (ATCC) reference bacterial and fungal strains were evaluated. Among them, only 1.35Ni-TCP displayed an effective antimicrobial activity against Gram-positive bacteria (50 mu g/mL Minimum Inhibitory Concentration (MIC) range), while other types of doped beta-TCPs did not possess with such effect. The in vivo tests showed that each formulation could be a good nominate for bone healing and bone treatment.
  • Küçük Resim Yok
    Öğe
    The effects of urea content on the structural, thermal and morphological properties of MgO nanopowders
    (Elsevier Sci Ltd, 2018) Ercan, Ismail; Kaygili, Omer; Ates, Tankut; Gunduz, Bayram; Bulut, Niyazi; Koytepe, Suleyman; Ozcan, Imren
    In the present study, we have looked into the effects of the amount of the combustion fuel of urea on the morphological, thermal and morphological properties of MgO structure. To this goal, three Magnesium Oxide (MgO) samples were synthesized by the combustion method and the as-mentioned properties were characterized by the experimental analysis techniques of X-Ray Diffraction (XRD), Differential Thermal Analysis (DTA), Thermogravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM). The functional groups in the samples were also determined using Fourier Transform Infrared (FTIR) spectrometry. The crystallinity percent values for each sample were found to be about in the range of 94-96%. The crystallite sizes of the samples were computed to be in the ranges of 26-37 nm and 23-32 nm for Scherrer and Williamson-Hall methods, respectively. The increasing quantity of urea caused a gradual growth in the lattice parameter of Magnesium Oxide structure. The thermal properties and morphology were affected by the urea content.
  • Küçük Resim Yok
    Öğe
    The effects of Zn/Fe co-dopants on the structural, thermal, magnetic, and in vitro biocompatibility properties of calcium pyrophosphate ceramics
    (Elsevier, 2022) Kebiroglu, Hanifi; Ates, Tankut; Bulut, Niyazi; Ercan, Ismail; Ercan, Filiz; Acari, Idil Karaca; Koytepe, Suleyman
    In the present work, calcium pyrophosphate (CPP) samples co-doped with Zn and Fe were prepared by using a wet chemical method, and their thermal, magnetic, structural, morphologic, and in vitro biocompatibility properties were investigated for the first time. X-ray diffraction (XRD) results showed that a continuous decreasing trend in two lattice parameters, unit cell volume, and average crystallite size was observed with the increasing Zn content. Zn content affected the magnetic and thermal behaviors, cell viability property of the CPP, as well as morphology. The sample containing 0.22 at.% Zn and 0.22 at.% Fe showed the best biocompatibility among all the samples, and the higher amount of Zn caused the lower cell viability. The bandgap of the CPP decreased with adding of Zn, while the linear absorption coefficient value increased.
  • Küçük Resim Yok
    Öğe
    An experimental and theoretical investigation of the structure of synthesized ZnO powder
    (Elsevier Science Bv, 2018) Kaygili, Omer; Ercan, Ismail; Ates, Tankut; Keser, Serhat; Orek, Cahit; Gunduz, Bayram; Seckin, Turgay
    ZnO powder has been synthesized, characterized experimentally and its theoretical modeling carried out by density functional theory (DFT). The experimental and theoretical results were compared with each other and with the available data in the literature. A detailed crystal structure analysis was carried out using X-ray diffraction (XRD) data. Experimental and theoretical FTIR analysis, energy gap and density of states and electronic band structure calculations have been done for a complete characterization of the material. The surface morphology has been investigated by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. It has been found that the electron excitation of ZnO can occur most probably at the Gamma-Gamma point, where the energy gap has the lowest value between the valance and conduction bands.
  • Küçük Resim Yok
    Öğe
    Investigation of the effects of Ni-doping on the structural and thermal properties of ZnAl2O4 spinels prepared by wet chemical method
    (Springer, 2021) Ercan, Filiz; Ates, Tankut; Kaygili, Omer; Bulut, Niyazi; Koytepe, Suleyman; Alahmari, Fatimah; Ercan, Ismail
    In this study, a more detailed characterization of the un-doped and Ni-doped ZnAl2O4 spinel structures prepared via a facile wet chemical route was carried out. Significant effects of the additive of Ni on the ZnAl2O4 structure were observed. For all the samples, the ZnO phase was detected as the second phase, and the third phase of NiO was observed for two samples having the highest Ni content. X-ray diffraction (XRD) results showed that the crystallinity percent, lattice parameter, and volume of the unit cell decreased continuously with adding of Ni. Fourier transform infrared (FTIR) spectra verify the formation of the ZnAl2O4 structure for all the samples. The thermal behaviors, including the recrystallization temperature and mass losses, of the ZnAl2O4 structure, were also affected by the amount of Ni. The morphology varied with adding of Ni. These properties were not reported before.
  • Küçük Resim Yok
    Öğe
    Structural and thermal properties of Zn-containing magnesium aluminate spinels obtained by wet chemical method
    (Sciendo, 2019) Kaygili, Omer; Bulut, Niyazi; Ates, Tankut; Ercan, Ismail; Koytepe, Suleyman; Seckin, Turgay; Tatar, Cengiz
    In the present study, the dopant effect of Zn on the crystal structure, thermal properties and morphology of magnesium aluminate (MgAl2O4) spinel (MAS) structure was investigated. A pure and two Zn-containing MASs (e.g. MgAl1.93Zn0.07O4 and MgAl1.86Zn0.14O4) were synthesized for this purpose via a wet chemical method, and the as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, differential thermal analysis (DTA), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy techniques. It was found that the crystal structure, thermal properties and morphology of the MAS system change with the increase in the amount of Zn. MgO phase formation was observed. The values of the lattice parameter, unit cell volume and crystallite size increased, and the crystallinity percentage decreased. The morphology was also affected by adding of Zn.
  • Küçük Resim
    Öğe
    Synthesis and Structural Characterization of Y-doped Pyramidal ZnO Powders
    (2020) Kebiroğlu, Hanifi; Kaygılı, Ömer; Bulut, Niyazi; Okur, Havva Esma; Ercan, Ismail; Ercan, Ismail; Yahıa, I.S.; Ateş, Tankut; Köytepe, Süleyman; Seçkin, Turgay; İnce, Turan
    Abstract: The present study focuses on the structural changes in ZnO powder induced by doping of a rare earth metal of Y. For this aim, we synthesized four ZnO samples with different Y-content using the combustion reaction method. X-ray powder diffraction (XRPD) technique and scanning electron microscopy (SEM) results confirm that the asinvestigated structural parameters and morphology of the ZnO structure were affected directly by the concentration of Y dopant. For each Y-doped sample, randomly-oriented pyramidal morphology and the formation of a minority phase of Y2O3 were observed. A gradual increase in both lattice parameters and unit cell volume was detected with increasing Y content. All samples were found to be thermally stable in the temperature interval of 25-950 °C.