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Öğe Fabrication and application of magnetic nanoparticles using red mud(AMER CHEMICAL SOC, 2016) Katircioglu, Zeynep; Dursun, Sami; Yavuz, Mustafa Selman[Abstract not Available]Öğe Fabrication of magnetic nanoparticles from red mud for arsenic removal(AMER CHEMICAL SOC, 2016) Katircioglu, Zeynep; Dursun, Sami; Yavuz, Mustafa Selman[Abstract not Available]Öğe Facile synthesis of "green" gold nanocrystals using cynarin in an aqueous solution(ELSEVIER SCIENCE BV, 2014) Katircioglu, Zeynep; Sakalak, Huseyin; Ulasan, Mehmet; Goren, Ahmet Ceyhan; Yavuz, Mustafa SelmanHerein we describe a water-based protocol that generates Au nanoparticles (AuNPs) by mixing aqueous solutions of HAuCl4 and cynarin (a natural product extract from artichoke leaf). Based on the observations from H-1 NMR spectrum of AuNPs, a polyol oxidation mechanism by metal ions which eventually results in AuNPs formation, is proposed. Basically, the aromatic alcohol groups (1,2-benzenediol) of cynarin are oxidized to alpha-hydroxy ketone intermediate product, and then further oxidized to the vicinal diketone final product while the Au3+ ions are reduced to its atomic form (Au-0) which leads the generation of Au nanoparticles. This new protocol has also been employed to prepare multiply twinned Pd nanoparticles and Ag cubical aggregates. Due to exclusion of organic solvent, surfactant, or stabilizer for all these synthesis, this protocol may provide a simple, versatile, and environmentally benign route to fabricate noble-metal nanoparticles having various compositions and morphologies. (C) 2014 Elsevier B.V. All rights reserved.Öğe Production of CuAlO2 in powder, bulk and nanofiber forms(KOREAN ASSOC CRYSTAL GROWTH, INC, 2015) Kaya, Ismail Cihan; Cetin, Cagla; Aydin, Hursit Safa; Katircioglu, Zeynep; Buyukbekar, Burak Zafer; Yavuz, Mustafa Selman; Uyaner, MesutA study was carried out on the production of CuAlO2 by using 3 different production routes namely, hydrothermal synthesis, conventional solid state reaction and electrospinning process. For hydrothermal synthesis, commercially available metal salts, Cu2O powder and chemically precipitated CuO nanoparticles were used as precursors. Bulk CuAlO2 samples were prepared via solid state reaction route by ball milling and high temperature sintering of CuO and Al2O3 powders. CuAlO2 ceramic mats were synthesized by electrospinning process with the assistance of polyvinylpyrolidone, as a template polymer. Highly crystalline mesh structured fibers were obtained after sintering of polymer/equal moles of copper chloride and aluminum nitrate composite in air. In the current work, solid state reaction and electrospinning processes yielded phase pure CuAlO2 in hexagonal symmetry. On the other hand, products obtained from hydrothermal synthesis were CuO, Cu2O and Al(OOH), which did not yield CuAlO2 under current experimental conditions. Detailed qualitative X-ray diffraction analysis revealed the need of specific ionic species in the solution within a narrow temperature-composition-pH window to obtain phase pure CuAlO2 employing hydrothermal conditions.Öğe Using the waste materials to generate nanoparticals and electrospun the nanofibers(AMER CHEMICAL SOC, 2015) Katircioglu, Zeynep; Dursun, Sami; Yavuz, Mustafa Selman[Abstract not Available]Öğe Water-based synthesis of Au nanoparticles by using cynarin(AMER CHEMICAL SOC, 2014) Katircioglu, Zeynep; Yavuz, Mustafa Selman; Goren, Ahmet Ceyhan[Abstract not Available]