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    Crystallinity Improvement of Co3O4 by Adding Thiourea
    (2020) Ercan, Filiz; Mahmood, Bahroz Kareem; Agıd, Riyadh Saeed; Bulut, Niyazi; Ercan, Ismail; Yahıa, I.S.; Ateş, Tankut
    Tricobalt tetraoxide (Co3O4) samples having different thiourea/Co molar ratio of 0, 5 and 10 were prepared by wetchemical synthesis. The effects of thiourea content on the crystal structure-related parameters of Co3O4 weredetermined. The increase in the amount of thiourea caused a gradual decrease in the lattice parameters and specificsurface area and an increase in the crystallinity and crystallite size. The experimental analysis results showed thatthiourea content can be used to control the crystal structure-related parameters of Co3O4.
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    The effects of Zn/Fe co-dopants on the structural, thermal, magnetic, and in vitro biocompatibility properties of calcium pyrophosphate ceramics
    (Elsevier, 2022) Kebiroğlu, Hanifi; Ateş, Tankut; Bulut, Niyazi; Ercan, İsmail; Ercan, Filiz; Açarı, İdil Karaca; Köytepe, Süleyman
    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.
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    Investigation of structural, spectroscopic, dielectric, magnetic, and in vitro biocompatibility properties of Sr/Ni co-doped hydroxyapatites
    (Elsevier Sci Ltd, 2022) Ercan, Filiz; Kayed, Tarek S.; Kaygılı, Ömer; Bulut, Niyazi; Almohazey, Dana; Ateş, Tankut; Al-Ahmari, Fatimah Saad
    In this study, the changes caused by Ni and Sr additives on the structural, thermal, dielectric, and magnetic properties of hydroxyapatite (HAp) samples were examined and reported for the first time in detail. Some effects of the Sr/Ni site disorder on the crystallographic, dielectric, and magnetic properties in Sr/Ni-HAp have been examined, as well as their cytotoxicity effects. The addition of Ni affected the morphology of nanoparticles with a low agglomeration increase. Our results showed that the dielectric constant (epsilon') and dielectric loss (epsilon '') have greater values at low frequencies than at higher frequencies for all the samples. It can be concluded that Ni and Sr additions to the HAp structure contribute to the development of thermal, magnetic, and dielectric properties required to mimic natural HAp in the study conducted with the idea of creating a medical application area for bone healing and regeneration. The cytotoxicity test of the produced nanoparticles and the evaluation of the results were also performed using human foreskin fibroblasts (HFF). The viability of cells after treatment for 48 h ranged between 50 and 75%. While 0.37Ni-0.37Sr-HAp and 1.11Ni-0.37Sr-HAp were similar to 0.37Sr-HAp, 0.74Ni-0.37Sr-HAp had the highest cellular viability. At 0.1 mg/mL, 0.74Ni-0.37Sr-HAp had a viability of 79.97% compared to the untreated control cells. Our Sr/Ni-HAp nanoparticles have promising medical applications in bone healing and regeneration.
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    Synthesis and Structural Characterization of Y-doped Pyramidal ZnO Powders
    (2020) Seçkin, Turgay; Köytepe, Süleyman; Okur, Havva Esma; Ercan, Filiz; Ercan, Ismail; Ateş, Tankut; Yahıa, I.S.
    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 concentrationof Y dopant. For each Y-doped sample, randomly-oriented pyramidal morphology and the formation of a minorityphase of Y2O3 were observed. A gradual increase in both lattice parameters and unit cell volume was detected withincreasing Y content. All samples were found to be thermally stable in the temperature interval of 25-950 °C.