Yazar "Bulut, Niyazi" seçeneğine göre listele

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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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    Experimental and theoretical characterization of Dy-doped hydroxyapatites
    (Springer, 2023) Isen, Fatih; Kaygili, Omer; Bulut, Niyazi; Ates, Tankut; Osmanlioglu, Fatih; Keser, Serhat; Tatar, Beyhan
    The effects of adding Dy to the hydroxyapatite (HAp) structure were investigated experimentally and theoretically. The as-obtained experimental results with an increasing amount of Dy are as follows. X-ray diffraction, Raman, and Fourier transform infrared measurements verified the HAp structure for each specimen. The crystallinity, lattice parameters, lattice stress, strain, and anisotropic energy density were affected. Thermal stability and stoichiometry were not affected. It was observed that all the Dy-doped HAps have smaller crystallite size values compared to the un-doped HAp. The cell viability obtained from mouse fibroblast cell (L929) was higher than 82%, indicating all the samples were biocompatible. The theoretical findings, obtained from the density functional theory (DFT) calculations, exhibited a continuous decrease in the bandgap from 4.7109 to 3.7982 eV, an increase in the density from 3,155 to 3,189 kg m(-3), and an increase in the linear absorption coefficient.
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    Exploring the Influence of Various Solvents on the Structural, Optical, and Spectroscopic Properties of MgO
    (Tayfun UYGUNOĞLU, 2024) Kareem, Rebaz Obaıd; Ahmad, Bast; Bulut, Niyazi; Demirci, Tuna; Ercan, Ismail; Ercan, Filiz; Ateş, Tankut
    Magnesium oxide (MgO) samples were manufactured at different temperatures using various solvents of water and ethanol. MgO structure was also modeled and its vibration modes were calculated. The kind of solvent as-used in the synthesis and calcination temperature caused changes in the lattice parameter, crystallinity, and crystallite size. The crystallite size increased with increasing production temperature for both series of the MgO. The morphology and bandgap energy were also affected significantly by the solvent and calcination temperature.
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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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    Investigation of the structural, thermal, magnetic and cell viability properties of Ce/Sr co-doped hydroxyapatites
    (Elsevier B.V., 2023) Ateş, Hülya Güneş; Kaygılı, O.; Bulut, Niyazi; Osmanlıoğlu, F.; Keser, S.; Tatar, B.; Mahmood, B.K.
    The present study aims to give a more detailed report on the structural, thermal, magnetic and in vitro cell viability properties of the hydroxyapatites (HAps) co-doped with Sr and Ce at different amounts. Besides these experimental analyses, this study also includes the theoretical calculation results obtained from the modeled systems for the as-prepared samples. Diamagnetic behavior was observed for all the samples, as well as their high cell compatibilities. All the samples showed a thermally stable behavior, and the mass change mechanism and specific heat capacity were affected by the amount of the co-dopants. The bandgap value and linear absorption coefficient varied with the amount of both co-dopants. © 2023 Elsevier B.V.
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    Structural, spectroscopic, dielectric, and magnetic properties of Fe/Cu co-doped hydroxyapatites prepared by a wet-chemical method
    (Elsevier, 2022) Ercan, Ismail; Kaygili, Omer; Kayed, Tarek; Bulut, Niyazi; Tombuloglu, Huseyin; Ince, Turan; Koysal, Oguz
    In this study, the effects of Cu and Fe additives on the structural, dielectric, magnetic, thermal and morphology of hydroxyapatite (HAp) samples were investigated and reported in detail for the first time. The prepared systems were also modeled and examined theoretically. It can be said that both additives affect the thermal behavior of the HAp structure. The addition of Cu affected the morphology of submicron-sized particles with spherical-like shapes with a low degree of agglomeration. Diffuse reflection data revealed that the energy band gap values decreased as Cu was added to the Fe-based HAp structure. The dielectric constant (epsilon') had high values at low frequencies in all samples and decreased with increasing frequency. It could be concluded that Fe/Cu incorporation to hydroxyapatites enhanced its thermal, magnetic, and dielectric properties required for mimicking natural HAps to open a successful venue for medical application in the healing regeneration of bone.