Yazar "Daday, Mine Taykurt" seçeneğine göre listele

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    Development and characterization of low temperature metallic glazes in Na2O-B2O3-SiO2 (NBS) system
    (Elsevier Sci Ltd, 2019) Mirdali, Nergis Kilinc; Daday, Mustafa; Daday, Mine Taykurt
    This paper presents the results of an investigation into crystal formation in NBS system for glaze with metallic appearance experimentally produced by embedding metallic substances as AgNO3, BaCl2, CuSO4 and CuCO3 and their characterizations. Composition of NBS was calculated by using Seger Method. According to the quantity of components, crystal phases were marked on Na2O-B2O3-SiO2 ternary diagrams. The amount of AgNO3 (2 wt%) was kept constant that other metallic substances (BaCl2, CuSO4 and CuCO3) were added in an amount of 5 wt% as had an impact on the mechanism of crystalline phase growth. These glaze compositions were applied over the surface of the commercial bodies and fired at 1040 degrees C, cooled to 750 degrees C and then reduced in the reductive atmosphere in order to obtain metallic layer on glaze surfaces for 20 min. These glaze layers characterized under mineralogical, microstructural and chemical points of view by means of X-Ray Diffraction (XRD), optical microscopy (OM), Scanning Electron Microscopy coupled with Energy Dispersive X-ray (SEM-EDX) and Ulltraviolet Visible Spectroscopy (UV-Vis) techniques. The results showed that silver and copper particles/crystals developed near/on the glaze surfaces creating multicolored metallic shine. Diffusion of metallic particles/crystals shown on the glazed layers as Ag and Cu followed by nucleation and growth in a reductive atmosphere.
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    Effect of chloride salts on coagulation behaviour of chromite particles having different roughness produced by rod and ball mills
    (Taylor & Francis Ltd, 2025) Guven, Onur; Kayabasi, Halim Recep; Daday, Mine Taykurt; Birinci, Mustafa; Ozdemir, Orhan
    Coagulation is a process usedto facilitate the agglomeration of particles with the contribution of variousfactors. Although the effects and contributions of many parameters forcoagulation have been reported in the literature, to our knowledge, there arevery few detailed studies on the effects of particle roughness. In this study,the effects of particle roughness obtained with different grinding conditionsand the role of different coagulants such as NaCl, CaCl2, AlCl3, and FeCl3 andtheir contribution to the coagulation of particles were investigated in detail.The results showed that by changing the salt type and major cation type duringthe sedimentation tests, the settling rate values for ball-milled chromitesamples increased from 0.086 cm/s to 0.095 cm/s with NaCl and AlCl3 salts, respectively,while a similar trend but a slightly higher settling rate values varied from0.092 to 0.101 cm/s for rod-milled chromite samples. Accordingly, the sampleswith rougher surfaces, as the rod mill product (2.581 mu m),settled slightly faster than those with the ball mill product (1.920 mu m). From this point of view, it can be suggested that theadjustment of grinding conditions should be taken into consideration during thecoagulation of very fine-sized materials. La coagulation est un proc & eacute;d & eacute; utilis & eacute; pour faciliter l'agglom & eacute;ration des particules gr & acirc;ce & agrave; divers facteurs. Le facteur le plus important qui rend ce proc & eacute;d & eacute; possible est l'interaction des forces qui poussent et attirent les particules ensemble. Par cons & eacute;quent, plusieurs param & egrave;tres tels que le pH, la granulom & eacute;trie, le type et la concentration de coagulant, le temps, etc. peuvent influencer le succ & egrave;s de ce proc & eacute;d & eacute;. Bien que les effets et les contributions de ces param & egrave;tres aient & eacute;t & eacute; rapport & eacute;s dans la litt & eacute;rature, & agrave; notre connaissance, il existe tr & egrave;s peu d'& eacute;tudes d & eacute;taill & eacute;es sur les effets de la rugosit & eacute; des particules. & Agrave; cette fin, dans cette & eacute;tude, on a examin & eacute; en d & eacute;tail les effets de la rugosit & eacute; des particules obtenue par diff & eacute;rentes conditions de broyage et le r & ocirc;le de diff & eacute;rents coagulants, tels que NaCl, CaCl2, AlCl3 et FeCl3 au m & ecirc;me pH d'environ 8, ainsi que leur contribution & agrave; la coagulation des particules. Les r & eacute;sultats ont montr & eacute; qu'en changeant le type de sel et le type de cation majeur pendant les essais de s & eacute;dimentation, les valeurs de taux de s & eacute;dimentation pour les & eacute;chantillons de chromite broy & eacute;s par des boulets ont augment & eacute; de 0.086 cm/s & agrave; 0.095 cm/s avec les sels de NaCl et d'AlCl3, respectivement, tandis qu'une tendance similaire mais avec des valeurs de taux de s & eacute;dimentation l & eacute;g & egrave;rement plus & eacute;lev & eacute;es variait de 0.092 & agrave; 0.101 cm/s pour les & eacute;chantillons de chromite broy & eacute;s par des barres. Cela d & eacute;montre que les valeurs de taux de s & eacute;dimentation sont affect & eacute;es non seulement par la valence et le type de cation majeur, mais & eacute;galement par les valeurs de rugosit & eacute; des & eacute;chantillons. Les & eacute;chantillons avec des surfaces plus rugueuses, comme le produit du broyeur & agrave; barres (2.581 mu m), ont s & eacute;diment & eacute; l & eacute;g & egrave;rement plus rapidement que ceux avec le produit du broyeur & agrave; boulets (1.920 mu m). On peut sugg & eacute;rer que l'on devrait prendre en consid & eacute;ration l'ajustement des conditions de production lors de la coagulation de mat & eacute;riaux de tr & egrave;s petite taille.
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    Kil İçeriği Yüksek Aslantaş Baraj Gölü Çökelti Malzemesinin Seramik Üretiminde Kullanılabilirliğinin Araştırılması
    (2019) Mirdalı, Nergis Kılınç; Daday, Mustafa; Daday, Mine Taykurt
    Aslantaş Baraj Gölü, Karatepe-Aslantaş Milli Parkı ve Açık Hava Müzesi’ne komşu olan kıyılara sahipbir baraj gölüdür. Bu bölgenin tarihi değeri düşünüldüğünde, çökelen hammaddenin tanınması veseramiklerde kullanımının araştırılması önem arz etmektedir. Çökelti malzemesinin tane boyutu vedağılımı, lazer parçacık boyutu ve dağılımı ölçme cihazı ile ölçülmüştür. Hammaddenin kimyasal vemineralojik analizi X-ışını floresans (XRF) ve X-ışını kırınımı (XRD) metodu ile yapılmıştır. Numuneninısıl davranışı termogravimetrik/diferansiyel taramalı analiz cihazı (TGA/DTA) ve optik dilatometre(ODHTM) ile tespit edilmiştir. Bünye numuneleri yarı-yaş yöntemle (plastik şekillendirme) hazırlanmış,astarlar renklendirilerek farklı kompozisyonlardaki seramik çamurlarından üretilen bünyeler üzerineuygulanmıştır. Numuneler 800, 900, 1000, 1100 ve 1200 oC’de fırınlanmış ve tüm bünyelerin boyutsalküçülme değerleri ölçülmüştür. Pişirimin ardından renk değerleri CIE-L*a*b* yöntemiyle tespitedilmiştir. Alınan sonuçların ışığında, hammaddenin, seramik astar ve bünye olarak kullanılabileceğifakat içerisindeki kalsiyum karbonat miktarının yüksekliği nedeniyle ince bir katman olarak uygulananastarlarda daha iyi sonuçlar elde edileceği saptanmıştır.
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    PROFILING THE BACTERIAL DIVERSITY IN HISTORIC LIMESTONE FROM ANAZARBOS ARCHAEOLOGICAL SITE BY ADVANCED MOLECULAR AND SPECTROSCOPIC TECHNIQUES
    (University of AEGEAN, 2022) Aydın, Rozelin; İpekci, Emre; Daday, Mine Taykurt; Yüceer, Hülya; Böke, Hasan
    The architectural remains as well as sculptures, mosaics, and other artifacts in the archaeological sites are mostly made of stone and susceptible to biodeterioration by microorganisms. Bacterial communities are known to have the most effective role in biological deterioration in stones. The ancient city of Anazarbos (Anavarza), chosen as the study area, is the 1st Degree Archaeological Site in the vicinity of Dilekkaya Village, Kozan District, about 70 km north of Adana. The microbiological, chemical, mineralogical, and microstructural properties of stone samples taken from different places were studied in this research. Samples were taken from i) where no deterioration occurred, ii) where different forms of deterioration were observed, iii) archaeological deposits, iii) archaeological deposits that came from deteriorated stone samples area. Spectroscopic, thermal, and microscopic techniques applied included: X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy-Energy Dispersive System (SEM-EDS), Thermogravimetric Analysis/Differential Thermal Analysis (TG/DTA). The bacterial biodiversity was analyzed by the application of Illumina-based next-generation sequencing methods. Results show intense biological colonisations with clay minerals on limestone surfaces. A patina of clay minerals was observed on newly excavated stone surfaces, while biological colonisations have not yet intensified. The metabarcoding analysis showed 15 bacterial phyla. The Proteobacteria and Actinobacteria were the most abundant phyla in both stones and archaeological deposits samples. Human activity (intensive agriculture, animal husbandry), accumulation of rainwater in excavated areas adversely affects stones, which leads to acceleration of biological deterioration in stones. Thus, all features of the site require multi-faceted studies prior to unearthing of archaeological remains. © 2022, University of AEGEAN. All rights reserved.
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    Understanding the role of sulfurization temperature and sulfur amount in two-stage fabricated Sb2S3 thin films for photodetection
    (Elsevier, 2026) Olgar, Mehmet Ali; Keser, Yasemen Ince; Cam, Meryem; Daday, Mine Taykurt; Yilmaz, Salih; Bacaksiz, Emin; Zan, Recep
    Sb2S3 thin films were fabricated via a two-stage process for photodetector applications. In the first stage, Sb thin films deposited by sputtering were sulfurized at various temperatures (350-425 degrees C) using a fixed sulfur amount (10 mg), and in the second, the sulfur amount (10-25 mg) was varied at 375 degrees C. The effects of sulfurization conditions on the chemical composition, crystal structure, surface morphology, optical, and electrical properties were systematically studied. This study establishes the critical role of sulfurization temperature and sulfur amount in determining the structural evolution and stoichiometry of Sb2S3 thin films, thereby enabling control over their photo-sensing performance. The optimal S/Sb ratio (approximate to 1.07-1.08) and crystallinity were achieved at 375 degrees C, yielding the large-grained, lower defect-free films with preferential (hk1) orientation. Increasing the sulfur amount enhanced the S/Sb ratio up to 1.43 but introduced an undesired (hk0) orientation beyond 20 mg. The sample prepared with 15 mg sulfur (SbS-375-15) exhibited favorable morphology, a proper bandgap (1.68 eV), the highest carrier concentration, and lowest resistivity, making it the best photodetector candidate. The corresponding device showed low dark current (<1 nA), high photocurrent (similar to 10 nA), fast response (rise/fall: 11.2/12.7 ms), sensitivity of 1090 %, detectivity of 2.45 x 10(6) Jones, and an external quantum efficiency (EQE) of 0.841 %, demonstrating the strong potential of Sb2S3 for high-performance photodetectors.
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    Wheat Germ Oil for Enhanced Stability of Microencapsulated Fish Oil During Spray Drying and Optimization of Coating Component Ratios
    (Springer, 2025) Ozyurt, Gulsun; Daday, Mine Taykurt; Sakarya, Yetkin; Kuley, Esmeray
    Wheat germ oil (WGO) was added to improve resistance to oxidation and thermal deterioration in the spray drying of fish oils (FO), and appropriate coating material combinations were investigated in microencapsulation. FO and WGO blends were encapsulated using different ratios of maltodextrin (MD) and gum arabic (GA), with a fixed amount of whey protein isolate (WPI). The PV and TBARs' values of fish oil microcapsules with WGO were significantly lower than those of the control groups without WGO. After emulsification and spray drying, EPA and DHA levels were significantly lower in groups without WGO, whereas the highest EPA and DHA content was observed in the group coated with 10% WGO and a 1WPI:2MD mixture. Microencapsulation efficiency (ME) ranged from 71.20 to 78.55%, with the highest ME in the MD-coated groups instead of GA. Although no large cracks or pores were observed in any microcapsule groups, the most uniform round and granular particles were seen in the combination of 10% WGO and 1WPI:2MD coating. Thermogravimetric analysis demonstrated improved thermal stability of the core material, with shifts in peak positions suggesting interactions between wall and core materials. Increasing WGO raised thermal decomposition temperatures, enhancing stability. In conclusion, MD was found to be more suitable than GA for fish oil microencapsulation with WPI due to its higher microencapsulation efficiency, more favorable particle morphology, and greater oxidative and thermal stability.