Yazar "Ozyilmaz, Ali Tuncay" seçeneğine göre listele

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    The application of polycarbazole, polycarbazole/nanoclay and polycarbazole/Zn-nanoparticles as a corrosion inhibition for SS304 in saltwater
    (Elsevier Science Sa, 2015) Ates, Murat; Ozyilmaz, Ali Tuncay
    Polycarbazole (PCz), polycarbazole/nanoclay and polycarbazole/Zn-nanocomposites were chemically and electrochemically synthesized on a stainless steel (SS304) electrode. The modified electrodes were characterized by electrochemical methods (CV and chronoamperometry), Fourier transform infrared spectroscopy (FTIR)-attenuated transmission reflectance (ATR), scanning electron microscopy (SEM)-energy dispersive X-ray analysis (EDX), four point probe, electrochemical impedance spectroscopy (EIS), and equivalent circuit model of R-s(Q(c)(R-c(Q(p)R(ct)))). The electrochemical behavior of the modified films on SS304 was assessed by open circuit potential monitoring, potentiodynamic polarization and EIS measurements to test the corrosion protection efficiency against 3.5% NaCl solution. PCz, PCz/nanoclay and PCz/nanoZn films obtained by chemical method coated on SS304 electrode exhibited better corrosion protection performance compared to the films obtained by the electrochemical method. This result may be attributed to the effective formation of a thin and protective layer. The highest protection efficiency (PE=99.81%) was obtained for chemically synthesized PCz films. (C) 2015 Elsevier B.V. All rights reserved.
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    The Formation of Passive Layers on Zinc Based Platings
    (Slovensko Kemijsko Drustvo, 2016) Ozyilmaz, Ali Tuncay; Ozyilmaz, Gul; Karahan, Ismail Hakki
    Zinc-iron (ZnFe) and zinc-iron-cobalt (ZnFeCo) platings were achieved on carbon steel applying 3 mA current values. Then, oxalate (OX) and tartrate (Tart) passive layers obtained in sodium oxalate and sodium tartrate medium were formed on carbon steel, ZnFe and ZnFeCo plated carbon steel. SEM images showed that the passive layers on CS, CS/ZnFe and CS/ZnFeCo electrodes exhibited different crystal structures. Corrosion tests revealed that the ZnFeCo particles provided a significant barrier efficiency on CS layer when compared with ZnFe alloy plating. Furthermore, OX layers on ZnFe and ZnFeCo plated carbon steel electrodes exhibited better physical barrier behavior on than those of Tart layers in longer periods
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    Glucose-Sensitive Biosensor Design by Zinc Ferrite (ZnFe2O4) Nanoparticle-Modified Poly (o-toluidine) Film
    (Natural and Engineering Science, 2023) Ozyilmaz, Ali Tuncay; Bayram, Esiye Irem
    Glucose oxidase (GOD) immobilized poly(o-toluidine) (POT) coated Pt electrode was designed for glucose-sensitive biosensor. Since POT film structure affects enzyme activity, parameters of enzyme immobilization and POT synthesis conditions were optimized. Optimal monomer concentration for POT film synthesis was determined as 40 mM and the scanning rate was determined as 50 mV/s. As for the immobilization process results, GOD, glutaraldehyde (GAL) and chitosan (Chi) concentrations were decided as 2 mg/ml 0.10%, and 0.5% for the Pt/POT electrode. Zinc ferrite nanoparticle (ZnFe2O4NP) was immobilized together with POT film in the presence of GOD enzyme. It was revealed that ZnFe2O4NP increased the current responses and stability of the Pt/POT electrode. © 2023, Natural and Engineering Science. All rights reserved.
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    Nanoparticle and Schiff Base Compound in Poly(O-Aminobenzyl Alcohol) Coating for Protection of 316L Stainless Steel against Corrosion
    (Trans Tech Publications Ltd, 2022) Ozyilmaz, Ali Tuncay; Celik, Cumali; Ozgen, Begum
    The electrochemical synthesis of poly (o-aminobenzyl alcohol) (PABA) coatings containing three different amounts of NiZnFe 4 O 4 nanoparticle (NP) with and without 0.25 mM Schiff base (ORG) on stainless steel (SS) was carried out in 0.15 M LiClO 4 containing acetonitrile (ACN) solution. The synthesis curves of PABA-NP and poly (o-aminobenzyl alcohol -Schiff basenanoparticle (PABA-ORG-NP) films exhibited the different current and monomer oxidation potential values indicating the presence of NP and ORG compounds. Besides, the addition of ORG to the NP -containing synthesis solution resulted in an increase in the electropolymerization rate of the PABA film compared to the NP -containing medium alone. Indeed, scanning electron microscopy (SEM) images of PABA-NP and PABA-ORG-NP also showed that their morphological structures were different. According to results of the evaluation of the impedance analysis, it was seen that PABA-NP and PABA-ORG-NP films provided significant physical barrier behavior to the SS electrode, in 3.5% NaCl solution. PABA-NP 25 and PABA-ORG-NP 25 coatings exhibited more protection behavior against the move of corrosive substances to SS. The presence of both NP and ORG in the polymer coating further improved the superior protection property of the PABA film, for a longer time.
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    Optimization of Graphite-Mineral Oil Ratio With Response Surface Methodology in Glucose Oxidase Based Carbon Paste Electrode Design
    (Natural and Engineering Science, 2022) Yağız, Esra; Ozyilmaz, Gül; Ozyilmaz, Ali Tuncay
    In this study, construction of amperometric glucose biosensor was carried out by immobilizing of glucose oxidase (GOD) on carbon paste electrode (CPE) which was coated with polyaniline (PANI) by cyclic voltammetry technique. Since the current values to be measured depending on the glucose concentration will be affected by the graphite:mineral oil composition of the electrode, this parametres were optimized by response surface methodology (RSM). For this, State Ease Design Expert 8.0.7.1. (Serial Number: 0021-6578) software software was used applying Optimal Design. By using data obtained, Design Expert software suggested quadratic model to predict current values in terms of working parameters. In study, experimentally measured current values and predicted values by model were considerably found compatable and suitability of model was supported by ANOVA test. © 2022, Natural and Engineering Science. All rights reserved.
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    Poly(2-chloroaniline) and poly(aniline-co-2-chloroaniline) films on ZnFe alloy plating
    (Emerald Group Publishing Ltd, 2018) Akdag, Abdurrahman; Ozyilmaz, Gul; Ozyilmaz, Ali Tuncay
    Purpose The purpose of this paper is to evaluate and compare the protective, anticorrosion behaviors and electrochemically synthesis of poly(2-chloroaniline) (PCANI) and poly(2-chloroaniline-co-aniline) P(CANI-co-ANI) films on thin zinc-iron plated carbon steel (CS). Design/methodology/approach Zinc-iron (ZnFe) alloy plating was successfully achieved on CS applying 3 mA constant current value. The PCANI and P(CANI-co-ANI) films on ZnFe-plated CS electrode were synthesized by cyclic voltammetry technique using monomer(s) containing 0.20 M sodium oxalate solution. The CS/ZnFe electrodes with and without PCANI or P(CANI-co-ANI) films were characterized using SEM and anodic linear sweep voltammograms. The anticorrosive behaviors of uncoated and coated electrodes were studied in 3.5 per cent NaCl solution by corrosion techniques which include open circuit potential measurements, the anodic polarization curves and alternative current electrochemical impedance spectroscopy (EIS) technique. Findings The protection efficiency values (E per cent) for CS/ZnFe, ZnCS/ZnFe/PCANI and CS/ZnFe/P(CANI-co-ANI) electrodes were calculated as 71.05, 84.53 and 92.79, respectively, after 168 h of immersion time. The results showed that P(CANI-co-ANI) coating on ZnFe-plated CS electrode exhibited higher corrosion resistance and provided better barrier property in comparison with PCANI coating and ZnFe alloy plating, in longer exposure time. Originality/value A number of reports on the synthesis and characterization of PANI have appeared in the literature during the past decade, but there is no such publication of PCANI. At the same time, the synthesis of PCANI onto the surface of metal alloy coating being the first of this kind, no such proceedings have been reported in the literature so far.
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    Poly(N-methylpyrrole) Film on ZnNi Plated Carbon Steel Electrode
    (Slovensko Kemijsko Drustvo, 2017) Akdag, Abdurrahman; Ozyilmaz, Ali Tuncay
    In this study, zinc-nickel (ZnNi) particles were electrochemically deposited on carbon steel (CS) electrode applying constant current of 1 mA with chronopotentiometry technique. Poly(N-methylpyrrole) (PNMP) film on CS/ZnNi electrode was synthesized with cyclic voltammetry technique from 0.10 M N-methylpyrrole containing 0.20 M sodium oxalate solution. The corrosion performances of coated and uncoated electrodes in 3.5% NaCl solution were evaluated with the help of AC impedance spectroscopy (EIS) and anodic polarisation curves. Scanning electron microscopy (SEM) and linear sweep voltammetry (LSV) were used to characterization of coatings. It was shown that the ZnNi particles exhibited important barrier effect on CS substrate. The highest 298350 ohm value of polarization resistance showed that PNMP film on the CS/ZnNi electrode exhibited an effective barrier property and electrocatalytic behaviour protection of substrate for longer exposure time.
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    Poly(O-aminobenzyl alcohol) films with and without organic compound on aisi 316 surface; synthesis and the corrosion performances
    (Turkish Chemical Society, 2020) Ozyilmaz, Ali Tuncay; Ozgen, Begüm; Celik, Cumali
    In this work, we obtained the anticorrosive properties of polymer films (SS/PABA and SS/PABA-ORG) synthesized on stainless steel surface by adding an organic substance to aniline derived o-aminobenzyl alcohol monomer synthesis medium. Firstly, we prepared the polymer coating bath by dissolving 0.15 M o-aminobenzyl alcohol monomer in the electrolyte solvent containing acetonitrile and 0.15 M LiClO4. From this bath, poly (o-aminobenzyl alcohol) (PABA) film was synthesized in 30 segments by cyclic voltammetry (CV) technique at a scanning rate of 50 mV/s at a potential range of-0.20/1.80 V on the AISI 316 (SS) working electrode in contrast to the platinum electrode. For the synthesis of organic structure doped polymer film (PABA-ORG), we repeated the same synthesis process by dissolving C21H27NO2(k) (ORG) at low concentration in the same bath. We investigated the corrosion performances of bare SS, SS/PABA, and SS/PABA-ORG substrates, using open circuit potential – time, anodic polarization, and AC impedance techniques in the solution of corrosion study. As a result, we observed that the organic additive added to the synthesis medium caused changes in the synthesis behavior of PABA. Corrosion performance tests showed that PABA and PABA-ORG films increased the corrosion protection performance of the SS electrode, and we observed a reduction of the corrosion rate of the SS electrode. © 2020, Turkish Chemical Society. All rights reserved.
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    Poly(o-anisidine) on brass
    (Korean Inst Chem Engineers, 2008) Ozyilmaz, Ali Tuncay; Ozyilmaz, Gul; Yilmaz, Ercan; Colak, Nureddin
    The electrochemical synthesis of poly(o-anisidine) (POA) was achieved on brass (CuZn) electrode by applying two scan rates (50 and 20 mVs(-1)). The synthesized polymer films were strongly adherent and homogeneous in both cases. Their corrosion performance was investigated by AC impedance spectroscopy (EIS) technique, anodic polarization plots and open circuit potential-time curves, in 3.5% NaCl solution. It was clearly seen that poly(o-anisidine) films provided a significant physical protection for longer exposure time. It was shown that polymer film coated at high scan rate (CuZn/POA-H) exhibited better barrier property against the attack of corrosive agents when compared with polymer film obtained at low scan rate (CuZn/POA-L). It was found out that poly(o-anisidine) film synthesized at high scan rate caused a significant increase in corrosion resistance by its catalytic behavior on formation of protective oxide layers on the surface in longer time.
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    Synthesis of Poly (Aniline-Co-O-Anisidine) Film in Electrolyte Mixture and Its Anticorrosion Behavior
    (Natural and Engineering Science, 2021) Ozyilmaz, Ali Tuncay
    Poly (aniline-co-o-anisidine) of copolymer coating was synthesized on copper surface (Cu) in an aqueous solution containing 90 ml of 0.20 M NaOX + 10 ml of 0.20 M oxalic acid. The copper substrate in NaOX solution containing oxalic acid had a fairly reliable passive surface mainly due to the formation of copper (II) oxalate layer. The addition of oxalic acid to working electrolyte contributed to both the amount of copolymer deposition (growth) and that of copolymer coated per unit time of electropolymerization (growth rate). The corrosion performances of copolymer coatings were investigated in 3.5 % NaCl solution with anodic polarization curves and electrochemical impedance spectroscopy. The results showed that oxalic acid led to the diminishing of the permeability of copolymer film. The copolymer coating exhibited an effective barrier property on copper electrode and provided a remarkable anodic protection to substrate for longer exposure time. © 2021, Natural and Engineering Science. All rights reserved.