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Öğe Evaluation of the corrosion inhibiting efficacy of a newly synthesized nitrone against St37 steel corrosion in acidic medium: Experimental and theoretical approaches(Elsevier Science Bv, 2018) Gerengi, Husnu; Solomon, Moses M.; Ozturk, Serkan; Yildirim, Ayhan; Gece, Ender Gökhan; Kaya, ErtugrulA novel amphiphilic nitrone, N-phenyl-1-(4-((11-(pyridin-1-ium-1yl) undecanoyl) oxy)phenyl)methanimine oxide bromide (NP-1-4-11-PUOPMOB) has been synthesized from a fatty acid derivative as a starting material. Structural characterization of the new compound has been realized by spectroscopic techniques (FTIR, H-1 NMR, and C-13 NMR). The corrosion inhibition effect of the compound for St37 steel corrosion in 1 M HCl medium has been investigated using experimental (weight loss, electrochemical impedance spectroscopy, potentiodynamic polarization, dynamic electrochemical impedance spectroscopy) and theoretical approaches complemented by surface morphological examination using energy dispersive X-ray spectroscopy, scanning electron microscope, and atomic force spectroscopy. Results from both chemical and electrochemical techniques reveal that the presence of the nitrone in the acid solution impedes St37 steel corrosion. The inhibition efficiency obtained at 125 ppm and 150 ppm concentrations for all methods is found to be over 90%. NP-1-4-11-PUOPMOB behaves as a mixed type corrosion inhibitor according to the potentiodynamic polarization studies. The adsorption of NP-1-4-11-PUOPMOB molecules onto the metal surface follows Langmuir adsorption isotherm and the calculated K-ads (equilibrium constant of the adsorption process) value reflects strong interaction. There is evidence of NP-1-4-11-PUOPMOB adsorption on the metal surface from SEM, EDAX, and AFM studies. Experimental and theoretical results are in good agreement.Öğe Flexible Semicrown Ether-Linked Symmetric Cationic Gemini Surfactants: Synthesis and Evaluation as Catalysts for Acceleration of Diastereoselective [3+2] Cycloaddition Reaction in Reversed Phase Micellar Media(Wiley, 2019) Ozturk, Serkan; Yildirim, Ayhan; Gece, Ender Gökhan; Turkdemir, HalukNovel cationic gemini surfactants with a hydrophilic oligo-oxyethylene spacer group were synthesized and their physicochemical properties were identified. Computational studies for these compounds were also performed; molecular geometry, frontier molecular orbitals, and quantum chemical parameters were calculated using density functional theory (DFT). After exploration for catalytic activity, it was found that these surfactants can efficaciously accelerate the [3 + 2] cycloaddition reactions in reversed phase micellar media.Öğe Newly Synthesized Pyridinium Salt Based Tricationic Surfactants as Corrosion Inhibitor for Carbon Steel in 1.0 M HCl Medium(Pleiades Publishing Ltd, 2023) Ozturk, Serkan; Gece, Gokhan; Yildirim, Ayhan; Gerengi, HusnuTwo pyridinium salt based tricationic surfactants were synthesized using quarternization reaction. The characterization of the surfactants were done by spectroscopic methods (FT-IR and NMR). Some pysicochemical properties like critical micelle concentration, surface tension at critical micelle concentration, Gibbs free energy of micelization, foam height, foam stability and emulsion stability were measured. The anticorrosion properties of the synthesized compounds were investigated by gravimetric measurements. In corrosion tests, where both compounds showed inhibitory activity against the corrosion of carbon steel in 1.0 M HCl environment, while the inhibition efficiency of the compound containing 6 carbon atoms in the long chain was determined in the range of 62-76%, those of the compound containing 8 carbon atoms in the long chain was found in the range of 85-93%. On the other hand, density functional theory (DFT) calculations were applied to arrive at basic molecular/electronic level scale details about the synthesized compounds, in addition to the surface images of the metal obtained by scanning electron microscopy to support the corrosion prevention results.Öğe Resistance of di-cationic surfactant containing pyridinium ions to metal oxidation in 1.0 M HCl medium(Elsevier, 2025) Ozturk, Serkan; Gultekin, Zafer; Akgul, Gulsen; Gece, Gokhan; Olasunkanmi, Lukman O.In order to prevent metal corrosion in low-carbon steel, which is exposed to faster corrosion in acidic environments, a di-cationic surfactant containing two pyridinium ions with high anti-corrosion potential was synthesized in this study. The structural characterization of the new compound was carried out by spectroscopic techniques (FT-IR and NMR). As a result of corrosion tests performed with electrochemical techniques such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) for different inhibitor concentrations (2, 10 and 50 ppm) in 1.0 M HCl solution at 25 degrees C, it was found that the anti-corrosion effect increases with increasing inhibitor concentration. The adsorption of the surfactant to the metal surface has been proven by the contact angles measured for pure water dripping on the metal surface. From the equilibrium constant and Gibbs free adsorption energy calculated by Langmuir adsorption isotherm, it was determined that this di-cationic surfactant has a high adsorption ability and adheres to the surface by chemical adsorption. The chemical indices of conceptual density functional theory (DFT) were also examined to develop an understanding of how molecular/electronic factors can alter inhibition efficiency of inhibitor compound. In addition to this process, a Monte Carlo Simulation study was also performed. The corrosion protection of the metal was visually examined by scanning electron microscopy (SEM) analysis, the elemental percentage of the metal surface was revealed by electron dispersive X-ray spectroscopy (EDX) analysis and the average roughness of the surface was determined by atomic force microscopy (AFM) analysis.
