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Öğe Ce/Sm co-doped hydroxyapatites: synthesis, characterization, and band structure calculation(Springer, 2020) Kaygılı, Ömer; Vural, Gülay; Keser, Serhat; Yahia, İ.S.; Bulut, Niyazi; Ateş, Tankut; Köytepe, Süleyman; Temüz, Mehmet Mürşit; Ercan, Filiz; İnce, TuranIn this paper, Ce/Sm co-doped hydroxyapatites (HAps) were synthesized by a wet chemical route. The amount of Ce was kept at constant at the value of at.% 0.4, and the second dopant of Sm was used at different amounts of at.% 0, 0.6, 1.2, and 1.8, respectively. The effects of these co-dopants on the crystal structure, morphology, and thermal properties of HAp were determined experimentally using X-ray diffraction (XRD), scanning electron microscopy (SEM), differential thermal analysis (DTA), and thermogravimetric analysis (TGA). Furthermore, the band structure of the prepared samples was modeled theoretically using the quantum calculations of the density of states and band structure. A gradual increase from 26.56 to 36.23 nm in the crystallite size was observed. Although the amounts of the co-dopants of Ce and Sm did not affect the thermal stability and microstructure of HAp, its crystal structure-related parameters were affected by the amount of these co-additives. The partial substitution of both co-dopants was detected. The 0.4Ce-1.2Sm-HAp sample may be considered as the best crystal structure with a steady-state. It was seen that the band structure and density of states were also affected by these co-dopants. The bandgap value decreased gradually from 4.6078 to 4.0477 eV due to these dopants.Öğe Characterization of SrO samples produced at two different temperatures(Niyazi BULUT, 2021) Ince, Turan; Ateş, Tankut; Bulut, Niyazi; Keser, Serhat; Kaygili, Omer[Abstract Not Available]Öğe Experimental characterization and theoretical investigation of Zn/Sm co-doped hydroxyapatites(Elsevier, 2022) Hssain, Ala Hamd; Bulut, Niyazi; Ateş, Tankut; Köytepe, Süleyman; Kuruçay, Ali; Kebiroğlu, Hanifi; Kaygılı, ÖmerIn this study, the wet chemical method was used to synthesize Zn-doped hydroxyapatite (HAp) samples, and the effects of varying the amount of Sm addition on structural, thermal, and biocompatibility in vitro properties were studied. In addition, a density functional theory was used for modeling the as-synthesized samples to obtain the theoretical calculation results. XRD results confirmed the formation of biphasic compositions for all samples, and FTIR data supported the formation of the functional groups of hydroxyl and phosphate. More than 98% of samples showed the formation of the HAp phase. The addition of Sm resulted in an increase in the secondary phase of the ?-TCP from 0.60% to 1.49%. The lattice parameters (aandc),unit cell volume (V), lattice strain(?), and lattice stress? varied when Sm was added as a dopant. The crystallite size and crystallinity decreased as the Sm content increased, however, the anisotropic energy density gradually increased. Thermal analysis results confirmed that all samples seemed to be thermally stable. The addition of Sm did not result in any notable morphological modifications. Cell viability values of theZn-based HAp sharply decreased as a result of an increase in the Sm additive. Theoretical studies show that when the amount of Sm in the Zn-based HAp structure increases, the bandgap energy decreases from 4.68 to 4.40eV. An increasing density and decreasing unit cell volume have been observed, as confirmed by the theoretical results. In addition, there was a decrease in crystallinity as well as an increase in anisotropic energy density.Öğe Exploring Electronic and Structural Properties of Titanium-Doped Chlorapatite: A Theoretical and Experimental Investigation(Niyazi BULUT, 2023) Keser, Serhat; Ateş, Tankut; Bulut, Niyazi; Kaygılı, Omer[Abstract Not Available]Öğe Farklı Element Katkılı Sodyum Fosfat Camlarının Sentez ve Karakterizasyonu(Bilecik Şeyh Edebali Üniversitesi, 2021) Keser, Serhat; Tatar, Cengiz; Ateş, Tankut; İnce, Turan; Kaygılı, ÖmerBu çalışmada, yaş kimyasal yöntemi ile üretilen Ba ve Li katkılı sodyum fosfat (NaPO3) camları karakterize edildi. Ba katkılı numunelerin tamamının ve en yüksek Li katkısına sahip numunenin amorf yapıya sahip olduğu görüldü. Bunların haricindeki tüm numunelerin kristal yapıya sahip olduğu gözlendi. Fourier dönüşümlü kızılötesi (FTIR) spektroskopisi sonuçları NaPO3 yapısının oluşumunu desteklemektedir. Morfoloji, katkıların türü ve bunların miktarından etkilendi.Öğe Fe ve Ti katkılı Çift Fazlı Kalsiyum Fosfatların Sentez ve Karakterizasyonu(Malatya Turgut Özal Üniversitesi, 2021) Ateş, Tankut; İnce,Turan; Acar, Serdar; Kaygılı, Ömer; Bulut, Niyazi; Keser,Serhat; Köytepe, SüleymanBu çalışmada, Ti katkısının Fe esaslı çift fazlı kalsiyum fosfat malzemelerinin yapısal, morfolojik ve termal özellikleri üzerine etkileri araştırılmıştır. X-ışını kırınımı (XRD) analizi, üretilen numunelerin hem hidroksiapatit (HAp) hem de beta trikalsiyum fosfat (?-TCP) fazlarına sahip olduğunu doğrulamaktadır. Ayrıca, Ti katkısındaki artışla ?-TCP fazının miktarının arttığı görülmektedir. Fourier dönüşümlü kızılötesi (FTIR) spektroskopisi sonuçları, numunelerdeki karakteristik fonksiyonel grupların varlığını doğrulamaktadır. Ti miktarı morfolojiyi etkilemektedir. Numunelerin ısıl davranışları birbirine benzerdir ve oda sıcaklığından 1000 °C’ye kadar tüm numuneler termal olarak kararlıdırlar. Bu sıcaklık aralığında numunelerdeki kütle kayıpları % 1,63’e eşit veya altındadır.Öğe Investigation of structural properties of Pr-doped hydroxyapatites synthesized via an ultrasonic-assisted wet chemical method(Niyazi BULUT, 2023) Ateş, Tankut; Bulut, Niyazi; Kaygılı, Omer; Keser, Serhat[Abstract Not Available]Öğe Investigation of the effects of glycerol addition as a catalyst on the morphology and structural properties of Gd/Er co-doped hydroxyapatite(Niyazi BULUT, 2024) Mohammed, Bast Ahmed; Ateş, Tankut; Mahmood, Bahroz Kareem; Kareem, Rebaz Obaıd; Keser, Serhat; Bulut, Niyazi; Kaygılı, Omer[Abstract Not Available]Öğe Investigation of the effects of immersion period of simulated body fluid on the morphology and structural properties of Fe/Ni co-doped chlorapatites(Niyazi BULUT, 2023) Keser, Serhat; Ateş, Tankut; Bulut, Niyazi; Kaygılı, Omer[Abstract Not Available]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; Ateş, Tankut; Kaygılı, Ömer; Bulut, Niyazi; Köytepe, Süleyman; Alahmari, Fatimah; Ercan, İsmail; Hssain, Ala Hamdn 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.Öğe Kobalt Katkılı Kalsiyum Manganez Oksit Numunelerin Sentez ve Karakterizasyonu(Malatya Turgut Özal Üniversitesi, 2020) Ateş, Tankut; Köytepe,Süleyman; Kaygılı,ÖmerBu çalışmada, kobalt katkılı kalsiyum manganez oksit numunelerinin faz bileşimleri, kristal yapıları, yüzey morfolojileri ve termal özellikleri karakterize edildi. Co miktarının bu oksit yapı üzerindeki etkileri belirlendi. X-ışını kırınımı (XRD) sonuçları, kalsiyum manganez oksit fazlarının oluşumuna işaret etmektedir. Fourier dönüşümlü kızılötesi (FTIR) analizleri, her bir numune için peroksit yapısının oluşumunu doğrulamaktadır. Termal analiz sonuçları, üretilen numunelerin termal olarak kararlı olduklarını göstermektedir. Numunelerin taramalı elektron mikroskobu (SEM) gözlemleri ve enerji dağılımlı X-ışını (EDX) analizleri, Co katkısının morfolojiye etki ettiğini ve kalsiyum manganez oksit yapıya nüfuz ettiğini desteklemektedir.Öğe Quercetin and Gallic Acid containing Hydroxyapatites: Synthesis and Characterization(Niyazi BULUT, 2024) Ateş, Tankut; Keser, Serhat; Köytepe, Süleyman; Bulut, Niyazi; Kaygılı, Omer[Abstract Not Available]Öğe Structural, spectroscopic, dielectric, and magnetic properties of Fe/Cu co-doped hydroxyapatites prepared by a wet-chemical method(Elsevier, 2022) Ercan, İsmail; Kaygılı, Ömer; Kayed, Tarek; Bulut, Niyazi; Tombuloğlu, Hüseyin; İnce, Turan; Al Ahmari, Fatımah; Kebiroğlu, Hanifi; Ateş, Tankut; Almofleh, Atheel; Fırdolaş, Fatih; Köysal, Oğuz; Al-Suhaimi, Ebtesam Abdullah; Ghrib, Taher; Sözeri, Hüseyin; Yıldız, Mesut; Ercan, Filiz; Ateş, TankutIn 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 (??) 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.Öğe Synthesis and characterization of Ag-doped CeO2 powders(Springer Nature, 2021) Ateş, TankutIn this study, the experimental characterization of cerium oxide (CeO2) powders doped with Ag at various amounts of 1, 2, 3, and 4 at.% was done using X-ray diffraction (XRD), differential thermal analysis (DTA), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, Raman analysis, scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and vibrating sample magnetometry (VSM). The formation of the single phase of CeO2, having the cubic crystal structure, for all samples was observed. The phase structure was not affected by the as-used Ag contents. The addition of Ag caused an increase in the lattice parameter and a decrease in the crystallinity. In addition to these, non-gradual changes in the crystallite size were observed. The thermal stability for each sample was seen for each sample until 1000 °C. The morphology composed of the microparticles was observed. The magnetization and magnetic susceptibility values were affected by the amount of Ag dopant.Öğe Synthesis and Characterization of CeO2 samples doped with Bi(Niyazi BULUT, 2024) Ateş, Tankut; Keser, Serhat; Bulut, Niyazi; Kaygılı, Omer[Abstract Not Available]Öğe Synthesis and Characterization of Co-Doped SnO2 Samples(Bilecik Şeyh Edebali Üniversitesi, 2020) Ateş, Tankut; Kaygılı, Ömer; Bulut, Niyazi; Okur, Havva Esma; Keser, Serhat; Yahia, İ.S.; Köytepe, Süleyman; Seçkin, Turgay; Özcan, İmren; İnce, TuranThe un-doped and Co-doped SnO2 samples having high crystallinity were successfully prepared. The effects of Co content on the structural, thermal and morphological properties of SnO2 were investigated. Changes in the crystallite size and unit cell parameters were detected with adding of Co. The phase composition did not alter with the addition of Co. Both X-ray diffraction and Fourier transform infrared results confirmed the formation of the SnO2 structure for each sample. The thermal stability of the as-produced samples from room temperature to 900 °C was observed. The morphology was affected by Co content, and energy dispersive X-ray results verified the introduction of Co into the SnO2 structure.Öğe Synthesis and Characterization of Silver- and Dysprosium-doped Zinc Oxide Structures(Niyazi BULUT, 2025) Ateş, Tankut; Keser, Serhat; Bulut, Niyazi; Kaygili, OmerIn this study, silver (Ag) and dysprosium (Dy) doped zinc oxide (ZnO) samples were prepared using the wet chemical route, and characterized by X-ray diffraction (XRD), scanning electron microscopy, and energy dispersive X-ray (EDX) spectroscopy. For all the samples, a single phase of ZnO was observed. The addition of these dopants and their amounts affected the lattice parameters, bond lengths, and bond angles of the ZnO structure. The morphology was affected by the amount of these elements as used in this study. The EDX spectroscopy results supported the incorporation of these dopants into the ZnO lattice.Öğe The effects of duration of ultrasonication on the morphology and structural properties of Ni-doped hydroxyapatite structure(Niyazi BULUT, 2022) Ateş, Tankut; Keser, Serhat; Bulut, Niyazi; Kaygılı, Omer[Abstract Not Available]Öğe The effects of pH on the morphology and structural properties of Er/Yb co-doped hydroxyapatite(Niyazi BULUT, 2024) Mohammed, Bast Ahmed; Ateş, Tankut; Mahmood, Bahroz Kareem; Kareem, Rebaz Obaıd; Keser, Serhat; Bulut, Niyazi; Kaygılı, Omer[Abstract Not Available]Öğe Theoretical and experimental characterization of Pr/Ce co-doped hydroxyapatites(Elsevier, 2021) İbrahimzade, Lala; Kaygılı, Ömer; Dündar, Serkan; Ateş, Tankut; Dorozhkin, Sergey V.; Bulut, Niyazi; Köytepe, Süleyman; Ercan, Filiz; Gürses, Canbolat; Ercan, Filiz; Hssain, Ala HamdThis study presents a more extensive report on the experimental and theoretical characterization of the Ce-doped hydroxyapatite (HAp) samples additionally doped with Pr at varying amounts. To achieve this goal, four Ce-containing (a constant amount of 0.35 at.%) HAps additionally doped with Pr at various amounts (0.35, 0.70, 1.05, and 1.40 at.%) were synthesized via a combustion method. Besides, all these samples were modeled theoretically by using a density functional theory (DFT). Theoretical results showed that the bandgap energy decreased continuously from 4.5156 to 4.3097 eV. For all samples, the linear attenuation (or absorption) coefficient increased with the increasing amount of Pr and this parameter had a decreasing trend with the increase in the photon energy. An increase in the theoretical density and the lattice parameter c and a decrease of both the lattice parameter a and the unit cell volume were found. After analyzing the experimental data, the following results were observed: X-ray diffraction (XRD) and Fourier transform infrared (FTIR) data verified the formation of HAp phase (above 94% for all the samples) as the major phase and beta-tricalcium phosphate (?-TCP) as the minor one. The amount of ?-TCP phase was found to increase from 3.4 to 5.9% with the addition of Pr. Similar to the theoretical findings, an increasing trend for the density and decreasing one for the unit cell volume were detected. Both a decrease in the crystallinity and an increase in the anisotropic energy density were found. The results of the thermal analysis supported the thermal stability of all the samples. The cell viability was found to be affected by Pr-content.
