Yazar "Yiğitoğlu M." seçeneğine göre listele

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    Adsorption behavior of copper(II) ion from aqueous solution on methacrylic acid-grafted poly(ethylene terephthalate) fibers
    (John Wiley & Sons Inc, New York, NY, United States, 2000) Coşkun R.; Yiğitoğlu M.; Saçak M.
    The adsorption behavior of methacrylic acid-grafted poly(ethylene terephthalate) fibers was studied toward the copper(II) ion in aqueous solutions by a batch equilibriation technique. The influence of treatment time, temperature, pH of the solution, metal ion concentration, and graft yield were considered. One hour of adsorption time was found sufficient to reach adsorption equilibrium for the copper(II) ion. It was found that the adsorption isotherm of Cu(II) fits Langmuir-type isotherms. The adsorption process is not affected by the temperature when treated with low ion concentration, but is remarkably decreased at a high ion concentration. The heat of adsorption value was calculated as 0.71 kcal/mol. It was found that the reactive fibers are stable and regenerable by acid without losing their activity.
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    Öğe
    Preparation and characterization of pH-sensitive alginate-g-poly(N-vinyl-2-pyrrolidone)/gelatin blend beads
    (Korean Society of Industrial Engineering Chemistry, 2017) İnal M.; Işıklan N.; Yiğitoğlu M.
    In this study, pH-sensitive alginate-g-poly(N-vinyl-2-pyrrolidone)/gelatin (SA-g-PVP/Gel) blend beads were produced as controlled release system. Structural features of the SA-g-PVP/Gel beads were characterized by FTIR, X-RD, DSC, SEM and mercury intrusion-porosimetry. In vitro nifedipine (NFD) release was investigated at pH 1.2 for 2 h and followed by immersing at pH 7.4 for 6 h. Effects of diverse parameters such as grafting of PVP, copolymer/gelatin blend ratio, concentration of cross-linker and drug amount on the release of NFD were investigated. The NFD release from SA-g-PVP/Gel beads demonstrated pH-sensitivity of drug release. Cytotoxicity experiments of SA-g-PVP and SA-g-PVP/Gel beads displayed their biocompatible character. © 2017 The Korean Society of Industrial and Engineering Chemistry
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    Removal of cadmium (II) from aqueous solutions using sporopollenin
    (2004) Arslan Metin; Temoçin Zülfikar; Yiğitoğlu M.
    Sorption of cadmium ion from aqueous solution by sporopollenin, a polymer obtained from Lycopodium clavatum, was investigated. The influences of adsorption time, temperature, pH of solution, and Cd(II) concentration on the adsorbed amount were investigated. 45 minutes of adsorption time was found to be sufficient to reach equilibrium. The adsorption capacity of sporopollenin was found to be 82.3 ?mol·g-1. The heat of adsorption value was calculated as 15.3 J·mol-1. Influences of HCl, H 2SO4, HCl+H2SO4, and EDTA solutions on desorption were investigated.
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    Synthesis, characterization and wound healing ability of PET based nanofiber dressing material coated with silk sericin capped-silver nanoparticles
    (Elsevier Ltd, 2021) Gün Gök Z.; Yiğitoğlu M.; Vargel İ.; Şahin Y.; Alçığır M.E.
    In this study, silver nanoparticles coated with sericin (S-AgNPs) were adsorbed on poly (ethylene terephthalate)-g-poly(hydroxyethylmethacrylate) (PET-g-HEMA) nanofibers and the use of the obtained material as wound dressing was investigated. PET fibers were firstly grafted with HEMA for varying hydrophobic nature of PET. A wound dressing material was obtained from polymer solution of this copolymer with electrospinning under certain conditions. Then, negatively charged S-AgNPs were adsorbed on the surface of the nanofiber membranes. Scanning electron microscope (SEM), UV–Vis, X-ray fluorescence (XRF), thermal, mechanical, antibacterial and cytotoxicity analyzes of the modified membranes have been examined. It was found that the modified nanofibers with S-AgNPs had antimicrobial effects on gram positive and gram negative bacteria. The viability rates of the cells incubated with the modified material extract did not decrease below 70% after 1 and 3 days incubation in MTT test. In-vivo studies aimed at evaluating the performance of modified nanofiber surface were performed using Sprague-Dawley male rats. The healing process of deep burn wounds created in rats with different materials was monitored during the 21 days and it was found that the produced nanofibers was more effective in wound healing than the control group and had a healing rate close to a commercially used cover material. © 2020 Elsevier B.V.