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    Öğe
    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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    Öğe
    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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    Öğe
    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.