Yazar "Ozcan, Fatih" seçeneğine göre listele

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    Fabrication of protein scaffold by electrospin coating for artificial tissue
    (ELSEVIER SCIENCE BV, 2016) Ozcan, Fatih; Ertul, Seref; Maltas, Esra
    Protein nanofiber scaffolds were produced by electrospin coating for biomedical applications. Therefore, protein such as bovine serum albumin, gobulin and hemoglobin were used as scaffold for tissue engineering. The nanofiber diameters were found to be 75 nm of globulin, 117 nm for hemoglobin and 220 nm for BSA. The protein nanofibers were characterized by using Fourier transform infrared spectroscopy, Scanning electron microscopy, Transmission electron microscopy and Atomic force microscopy. (C) 2016 Elsevier B.V. All rights reserved.
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    Humic-makeup approach for simultaneous functionalization of polyacrylonitrile nanofibers during electrospinning process, and dye adsorption study
    (TAYLOR & FRANCIS INC, 2016) Gezici, Orhan; Guven, Idris; Ozcan, Fatih; Ertul, Seref; Bayrakci, Mevlut
    A useful methodology is represented to functionalize polyacrylonitrile nanofibers by using humic acid as a makeup agent in electrospinning process. Both morphology and surface chemistry of polyacrylonitrile nanofiber mats were understood to be influenced by incorporation of humic acid into the structure. Physicochemical changes were evidenced by Fourier transform infrared spectroscopy, scanning electron microscope, and surface charge measurements. Unlike some anionic dyes (i.e., methyl orange, methyl red, and Congo red), there was an enhancement in crystal violet (a cationic dye) adsorption after incorporation of humic acid. The Langmuir model fitted well to crystal violet data, and monolayer adsorption capacity was calculated as 81.6 mg/g (r(2) = 0.998).
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    Synthesis and characterization of boron doped bismuth-calcium-cobalt oxide nanoceramic powders via polymeric precursor technique
    (ELSEVIER SCI LTD, 2013) Aytimur, Arda; Uslu, Ibrahim; Cinar, Emre; Kocyigit, Serhat; Ozcan, Fatih; Akdemir, Ahmet
    In this study, boron doped calcium stabilized bismuth cobalt oxide nanocrystalline ceramic powders were successfully prepared from aqueous boric acid containing calcium bismuth cobalt acetate/poly(vinyl alcohol) hybrid precursor polymer solutions. Then, obtained ceramic powders were characterized via FT-IR. XRD, and SEM techniques. According to X-ray results, fcc and bcc phases coexist in the samples of the nanocrystalline ceramic powders. fcc peaks became sharper and bcc peak decreased with increasing boron content. Structural parameters for face centered cubic structure were calculated using the Scherrer equation. Moreover, dislocation densities and microstrain values were calculated for the nanocrystalline powder samples. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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    Synthesis and Preparation of Novel Magnetite Nanoparticles Containing Calix[4]arenes With Different Chelating Group Towards Uranium Anions
    (TAYLOR & FRANCIS INC, 2015) Ozcan, Fatih; Bayrakci, Mevlut; Ertul, Seref
    In this study, four new magnetite nanoparticle containing different chelating groups as ester, amide and azacrown moieties at the lower rim of calix[4]arenes were prepared by the reaction of formylated calix[4]arenes and amino propyl modified magnetite nanoparticles (APTMS-MN). All of the newly synthesized and prepared compounds were characterized by using different analytical techniques such as nuclear magnetic resonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and thermogravimetric analyses (TGA). Furthermore, uranium binding abilities of newly prepared magnetite nanoparticles were evaluated by using solid-liquid phase extraction process and obtained results showed that magnetite nanoparticles containing picolinamide units exhibited superior and more efficient extraction percentage for uranium ions at lower pH values.
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    Synthesis of calixamide nanofibers by electrospinning and toxic anion binding to the fiber structures
    (PERGAMON-ELSEVIER SCIENCE LTD, 2015) Bayrakci, Mevlut; Ozcan, Fatih; Ertul, Seref
    This study reports the synthesis of three novel polyacrylonitrile (PAN) nanofibers based calixamide containing pyridine groups by electrospinning. The structures of the newly prepared nanofibers were clarified using spectroscopic techniques. Analysis indicated that preparation of nanofibers based calixamide was successfully achieved. The presence of calixarene molecules in the nanofiber backbones was confirmed by Fourier transform infrared (FTIR-ATR), scanning electron microscope (SEM), and thermogravimetric analyses (TGA and DSC). The toxic anion binding studies exhibited that the nanofiber-based calixamide could be efficiently used for the binding of chromate anions as a model toxic oxoanion. Nanofiber based calixamide may be a good candidate as a filter material for water purification and waste treatment owing to their very large surface area as well as the inclusion complexation capability of all surfaces associated with the calixarene skeleton. (C) 2015 Elsevier Ltd. All rights reserved.