• The removal of heavy metals from refinery effluents by sulfide precipitation 

  Kartal, Levent; Şen, Aysel; Timur, Servet (BERG FAC TECHNICAL UNIV KOSICE, 2023)

  This study investigated the selective precipitation of copper (Cu2+), nickel (Ni2+) and zinc (Zn2+) ions from industrial wastewater by using sodium sulfide (Na2S). The effects of pH, time and free sulfide concentration on ...

• Single step calciothermic synthesis of nickel boride particles in molten salt 

  Kartal, Levent (Springer, 2023)

  Abstract In this study, production of nickel boride (NixB) via calciothermic reduction in molten salt has been studied. Firstly, the electrochemical behaviors of CaO and NiO in CaCl2 melt were examined by cyclic voltammetry ...

• Photoluminescence Investigation of Tb Doped Yb2O3 Phosphors Produced by Precipitation Method 

  Ünal, Fatma (2021)

  In this study, un-doped and Tb doped ytterbium oxide (Yb2O3:Tb3+) particles with different dopant rates (2, 4, 6 and 8 at. %) were produced by precipitation method, followed by subsequent calcination at 1000 °C for 2 h. ...

• ZrO2 coating via e-beam evaporation on PE separators for lithium-ion batteries 

  Sivlin, D.; Ünal, Fatma; Karahan, Deniz; Kazmanlı, Kürşat; Keleş, Özgür (Springer Heidelberg, 2021)

  In this paper, ZrO2 is deposited on a polyethylene-based separator via electron beam evaporation method. The analyses reveal that the application of the ceramic-based coating enhances the electrolyte uptake capability from ...

• Effect of Particle Morphology on Physical, Mechanical and Wear Properties of Cobalt Metal Powders 

  Bulut, Berrak; Ünal, Fatma; Baydoğan, Murat; Kayalı, Eyup Sabri (Springer India, 2021)

  Cobalt is used in applications that require high densities and good mechanical properties. Cobalt powder is used in batteries, cemented carbides, stainless steel, machine tools and also in manufacturing of metal matrix ...

• Synthesis, characterization and radioluminescence properties of erbium-doped yttria phosphors 

  Ünal, Fatma; Kaya, Faruk; Kazmanlı, Kürşat (Springer, 2021)

  Radioluminescence (RL) behaviour of erbium-doped yttria nanoparticles (Y2O3:Er3+ NPs) which were produced by sol-gel method was reported for future scintillator applications. NPs with dopant rates of 1at%, 5at%, 10at% and ...

• Fabrication and characterization of Yb-doped Y2O3 powders and thin films 

  Kaya, Elif Emil; Ünal, Fatma; Kazmanlı, Kürşat; Gürmen, Sebahattin (Carl Hanser Verlag, 2020)

  Yttrium oxide (Y2O3) and ytterbium (Yb)-doped Y2O3 particles were synthesized via the sol-gel method from the aqueous solution of their nitrate salts. The synthesized powders were then deposited on Corning glass substrates ...

• Formation of alpha/beta-Si(3)N(4 )nanoparticles by carbothermal reduction and nitridation of geopolymers 

  Bağcı, Cengiz; Yang, Qun; Kriven, Waltraud M. (Wiley, 2019)

  Silicon nitride (Si3N4) particles with various alpha/beta-Si(3)N(4 )ratios were fabricated from geopolymer (GP)-carbon compositions (M2O center dot Al2O3 center dot 4.5SiO(2)center dot 12H(2)O+18C), where M is an alkali ...

• Effects of dopant rate and calcination parameters on photoluminescence emission of Y2O3:Eu3+ phosphors: A statistical approach 

  Ünal, Fatma; Kaya, Faruk; Kazmanli, Kursat (Elsevier Sci Ltd, 2019)

  In this study, Y2O3:Eu3+ phosphorescent powders with different dopant rates were synthesized by sol-gel method. Statistical experimental design methods were used to investigate the effects of calcination temperature (800, ...

• Production of Un-Doped and Er-Doped Y2O3 Thin Films by Electron Beam Evaporation Method 

  Ünal, Fatma; Kazmanli, Kursat (Springer, 2019)

  In this study, un-doped and doped yttrium oxide (Y2O3) powders with different erbium concentrations were synthesized using sol-gel method. The synthesized powders were investigated by Raman analysis and the evolution of ...

• Production and characterization of re3+:Yb2o3 nanoparticles 

  Ünal, Fatma; Kazmanlı, Kürşat (Trans Tech Publications Ltd, 2021)

  In this study, doped ytterbium oxide (Yb2O3) nanoparticles (NPs) with different dopant type (Eu and/or Tb) and undoped were synthesized by wet chemical method using nitrate salt as a starting source. Afterwards, they were ...

• Effects of the alumina reinforcement ratio on the corrosion properties of iron based composite materials 

  Karacif, Kubilay (Carl Hanser Verlag, 2020)

  Iron based composite materials reinforced with various ceramic particles are used in operating conditions requiring features such as high hardness, strength and wear resistance. The composite materials may be subject to ...

• A New Approach for Cu and Fe/FexB Production from Chalcopyrite by Molten Salt Electrolysis 

  Kartal, Levent; Daryal, Mehmet Barış; Timur, Servet (Springer, 2020)

  In the present study, copper (Cu) and iron boride -( FexB) were produced for the first time through molten salt electrolysis using chalcopyrite -(CuFeS2) in an oxide- based borax electrolyte. Molten salt electrolysis was ...

• Modelling of relation between synthesis parameters and average crystallitesize of Yb2O3 nanoparticles using Box-Behnken design 

  Ünal, Fatma; Kaya, Faruk (Elsevier, 2020)

  A straightforward wet chemical method has been applied for the fabrication of Yb2O3nanoparticles (NPs) fromytterbium nitrate solution by using ammonium carbonate as precipitation agent. Effects of precursor molarity(0.1, ...

• Geopolimerlerden mekanokimyasal aktivasyon ile silisyum karbür tip nano parçacıkların üretilebilirliğinin araştırılması 

  Bağcı, Cengiz (Gazi Üniversitesi, 2017)

  Mekanokimyasal olarak 6, 12, 24, 48 saat süreyle aktive edilen ve M= (Na+ veya K+) olmak üzere, sodyum veya potasyum alkali metal içeren (M2OoAl2O3o4.5SiO2o12H2O+18C) geopolimer karbon kompozisyonlarının karbotermal ...

• Thermal grooving by surface diffusion: a review of classical thermo-kinetics approach 

  Akyıldız, Öncü; Oğurtanı, Tarık Ömer (Hitit University, 2017)

  In polycrystalline materials wherever a grain boundary intersects a free surface and whenever the topographic variation associated with the atomic motion is favored by total free energy dissipation, the material surface ...

• Mechanochemical activation of sodium geopolymers containing carbon-nano powder 

  Bağcı, Cengiz; Düzgün, Zehra (Gazi Üniversitesi, 2017)

  Mekanokimyasal aktivasyon için 9 veya 18 mol karbon nano-tozlar içeren iki farklı sodyum geopolymer iyi bilinen geopolymer yöntemi ile hazırlanmıştır. 9 mol karbon, geopolimer üretimi aşamasında geopolimer reçineye dahil ...

• Kaynaklı birleştirmeli konstrüksiyonların çarpılma eğilimlerinin belirlenmesi için deneysel bir yaklaşım 

  Özçatalbaş, Yusuf; Fındık, Tayfun; Kurt, Adem; Karacif, Kubilay; Özer, Alpay; Vural, Halil İbrahim (2008)

  Bu çalışmada, kaynaklı birleştirmeli konstrüksiyonların imalat sürecinde ve sonrasında oluşan çarpılma eğilimlerinin, çarpılma kuvvetleri vasıtasıyla belirlenmesi amaçlanmıştır. Bu amaçla, rijit bir kafes hücre sistemi ve ...

• A comparison on physical, structural, and photocatalytical properties of TiO2 nanopowders produced using sol-gel and flame spray pyrolysis 

  Erol, Mustafa; Sancakoğlu, Orkut; Yurddaşkal, Murat; Yıldırım, Serdar; Çelik, Erdal (2013)

  In this study, nanoscale photocatalyst TiO2 powders were synthesized via sol-gel and flame spray pyrolysis (FSP). Phase structures and ratios were analyzed by X-ray diffractometer (XRD). Size, specific surface area, and ...

• Effect of electrolytic nickel coating on fatigue life of iron based powder metal parts 

  Çinici, Hanifi; Karacif, Kubilay; Kafkas, Fırat; Çıtak, Ramazan (2011)

  Electrolytic coating is one of the methods mainly used to provide corrosion resistance for the powder metal parts. The coatings have strong effects on mechanical properties of coated parts as well as on surface properties. ...

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