Tankut Ates
Fırat University
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Featured researches published by Tankut Ates.
Materials Science and Engineering: C | 2015
Omer Kaygili; Serhat Keser; Mustafa Kom; Yesari Eroksuz; Sergey V. Dorozhkin; Tankut Ates; Ibrahim Hanifi Ozercan; Cengiz Tatar; F. Yakuphanoglu
The objective of this study is to present a detailed report related to the synthesis and characterization of strontium substituted hydroxyapatites. Based on this purpose, hydroxyapatite (HAp) bioceramics with different amounts of strontium (e.g., 0, 0.45, 0.90, 1.35, 1.80 and 2.25 at.%) were prepared using a sol-gel method. The effects of Sr substitution on the structural properties and biocompatibility of the samples were studied by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) techniques, in vitro and in vivo tests. All the samples composed of the nanoparticles ranging from 21 to 27 nm. The presence of Sr at low levels influenced the crystal size, crystallinity degree, lattice parameters and volume of the unit cell of the HAp. Both in vitro conditions and soaking period in simulated body fluid (SBF) significantly affected these properties. Especially, the (Ca+Sr)/P molar ratio gradually decreases with increasing soaking period in SBF. Animal experiments revealed the bone formation and osseointegration for all samples, and as compared with other groups, more reasonable, were observed for the sample with the lowest Sr content.
Materials Science and Engineering: C | 2014
Omer Kaygili; Serhat Keser; R.H. Al Orainy; Tankut Ates; F. Yakuphanoglu
The synthesis and characterization of sol-gel derived hydroxyapatite (HAp) were investigated with the effects of the addition of polyvinyl alcohol (PVA) to the structural and material in vitro behavior. All samples were soaked in simulated body fluid (SBF) for 14 and 28 days. The characterization of bioceramics before and after immersing in SBF was carried out by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, differential thermal analysis (DTA), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) techniques. After the simulated body fluid period, the crystal structure and phase of HAp samples did not change significantly. The characteristic bands of hydroxyl, phosphate and carbonate groups were detected. HAp exhibited a thermal stability of room temperature to 1000 °C. The surface morphologies of the samples show an evident change with the soaking period in SBF.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2014
Omer Kaygili; Tankut Ates; Serhat Keser; Ahmed A. Al-Ghamdi; F. Yakuphanoglu
The hydroxyapatite (HAp) samples in the presence of various amounts of ethylenediamine tetraacetic acid (EDTA) were prepared by sol-gel method. The effects of EDTA on the crystallinity, phase structure, chemical, micro-structural and dielectric properties of HAp samples were investigated. With the addition of EDTA, the average crystallite size of the HAp samples is gradually decreased from 30 to 22 nm and the crystallinity is in the range of 65-71%. The values of the lattice parameters (a and c) and volume of the unit cell are decreased by stages with the addition of EDTA. The dielectric parameters such as relative permittivity, dielectric loss and relaxation time are affected by the adding of EDTA. The alternating current conductivity of the as-synthesized hydroxyapatites increases with the increasing frequency and obeys the universal power law behavior. The HAp samples exhibit a non-Debye relaxation mechanism. The obtained results that the dielectrical parameters of the HAp sample can be controlled by EDTA.
Materials Science and Engineering: C | 2015
Omer Kaygili; Sergey V. Dorozhkin; Tankut Ates; N. Canan Gursoy; Serhat Keser; F. Yakuphanoglu; A. Birkan Selçuk
Hydroxyapatite (HAp) samples doped with 0, 2 and 4 at.% of yttrium (Y) were characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy attached with energy dispersive X-ray (EDX) spectroscopy, antimicrobial activity tests and dielectric studies. The hydroxyl groups observed in FTIR spectra confirmed the formation of HAp phase in the studied samples. The crystallite size, crystallinity degree and lattice parameters of the samples were changed with Y content. The volume of the unit cell was gradually decreased with the addition of Y. Undoped and Y-containing HAp samples were screened to determine their in vitro antimicrobial activities against the standard strains. It was found that no samples have any antimicrobial effect. The relative dielectric permittivity and dielectric loss are affected by Y content. While the alternating current conductivity increases with increasing frequency, it decreases with increasing Y content.
Sensors and Actuators A-physical | 2013
Tankut Ates; Cengiz Tatar; F. Yakuphanoglu
Ceramics International | 2014
Omer Kaygili; Sergey V. Dorozhkin; Tankut Ates; Ahmed A. Al-Ghamdi; F. Yakuphanoglu
Powder Technology | 2013
Omer Kaygili; Serhat Keser; Tankut Ates; Ahmed A. Al-Ghamdi; F. Yakuphanoglu
Ceramics International | 2013
Omer Kaygili; Serhat Keser; Tankut Ates; F. Yakuphanoglu
Journal of Inorganic and Organometallic Polymers and Materials | 2014
Omer Kaygili; Serhat Keser; Sergey V. Dorozhkin; F. Yakuphanoglu; Ahmed A. Al-Ghamdi; Sevda Kirbag; Duygu Sertkaya; Tankut Ates; N. Canan Gursoy
Materials Science and Engineering: C | 2015
Omer Kaygili; Serhat Keser; Tankut Ates; Cengiz Tatar; F. Yakuphanoglu