Browsing by Author "Tosun M."

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Determination of the physicochemical properties and ¹³C/¹²C isotope ratios of some honeys from the northeast Anatolia region of Turkey
(2018-06-01) Cengiz M.M.; Tosun M.; Topal M.
In the study, the honey was subjected to analyses after being taken from different producers immediately after the end of the production season. 13C/12C analysis was performed on the samples using an isotope ratio mass spectrometer (EA-IRMS) combined with an elemental analyzer. In all of the honey samples, the δ13C value was found to be more negative than −23.5‰ and even the C4 sugar ratio was found to be lower than 7%. The results from the physicochemical analysis of the samples were determined to be 15.9 ± 1.6% for the moisture content, 82.8 ± 1.1 for brix, 0.183 ± 0.02 mS/cm for conductivity, 24.4 ± 4.0 meq/kg for total acidity, 546 ± 80 mg/kg for proline, and 14.5 ± 3.5 for diastase activity. In addition, the sugar content was determined to be 38.8 ± 1.8% for fructose, 30.2 ± 1.7% for glucose, 69.1 ± 3.3% for fructose + glucose, and 1.29 ± 0.5 for fructose/glucose. When the analysis results were evaluated according to the relevant standards and codex, it was evident that the honey samples produced within the region are of very good quality.
Structural and mechanical properties of (Co/Mg) co-doped nano ZnO
(2015-06-01) Asikuzun E.; Donmez A.; Arda L.; Cakiroglu O.; Ozturk O.; Akcan D.; Tosun M.; Ataoglu S.; Terzioglu C.
The (Co/Mg) co-doped ZnO systems (ZnMgCoO) were synthesized as polycrystalline nanoparticles using the sol-gel technique. The effects of Co/Mg co-addition to the structural and mechanical properties of ZnO nanoparticles were investigated. Microstructural properties, such as phases, crystal structures and grain sizes are characterized by using X-Ray Diffraction (XRD) analysis and Scanning Electron Microscope (SEM). The microhardness values of the samples were evaluated by the Vickers tester. In the samples of the Co>Mg ratio, Indentation Size Effect (ISE) behaviors were observed. On the other hand, in the samples of the Mg>Co ratio, Reverse Indentation Size Effect (RISE) was observed. These were analyzed in detail utilizing the models for materials hardness analysis found in literature.
Structural and mechanical properties of ZnMgO nanoparticles
(2014-01-10) Tosun M.; Ataoglu S.; Arda L.; Ozturk O.; Asikuzun E.; Akcan D.; Cakiroglu O.
This study reports the effect of annealing temperature on the structure and mechanical properties of Zn0.95Mg0.05O bulk samples by using digital Vickers microhardness tester, X-ray diffraction analysis, scanning electron microscopy and electron dispersive X-ray measurements. The samples were prepared using Zn and Mg based alkoxed by the sol-gel technique and annealed at various temperatures (500, 600, 700 and 800°C). Vickers microhardness, elastic modulus, yield strength and fracture toughness values of Zn0.95Mg0.05O bulk samples were separately calculated and compared with each other. The experimental results of hardness measurements were analyzed using Meyer's law, Proportional Specimen Resistance (PSR) and Elastic/Plastic Deformation (EPD) models and Hays-Kendall (HK) approach. Finally, it was seen that HK approach is the most successful model for the microhardness analysis of these materials. © 2013 Elsevier B.V.