Person: ÖZTÜRK, SERKAN
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ÖZTÜRK
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SERKAN
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Publication Non-gemini dicationic surfactants with alkylthio group as corrosion inhibitor for mild steel in HCI solution(Springer, 2022-09-13) Öztürk, Serkan; ÖZTÜRK, SERKAN; Fen Edebiyat Fakültesi; Kimya Bölümü; AAH-1812-2021Two non-geminine dicationic surfactants containing long chain -dodecyl and heptadecylthio groups were synthesized and their structures were confirmed by spectroscopic methods (FT-IR and NMR). At different concentrations of synthesized inhibitors (5, 25, 50 and 100 ppm) their effectiveness against corrosion of mild steel was investigated by weight loss method for different immersion times (1-4 day) in 1.0 mol L-1 HCl solution. In addition, inhibition efficiencies were investigated in HCl solutions with different concentrations (1.0, 2.0 and 4.0 mol L-1) at 50 ppm inhibitor concentration. While they exhibited good inhibitory properties at all immersion times, they showed the best inhibition activities at 4 days of immersion. In corrosion inhibition tests performed in 2.0 to 4.0 mol L-1 HCl solutions, dicationic surfactant containing dodecylthio group showed higher protection. The critical micelle concentrations of the two synthesized compounds and the surface tension at this concentration were determined, and scanning electron microscopy (SEM) images of metal surfaces were obtained to support the corrosion results.Publication 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, 2019-03-01) Öztürk, Serkan; Yıldırım, Ayhan; Gece, Gökhan; Türkdemir, Haluk; ÖZTÜRK, SERKAN; YILDIRIM, AYHAN; TÜRKDEMİR, MEHMET HALUK; Fen Edebiyat Fakültesi; Kimya Bölümü; 0000-0002-9396-1403; 0000-0002-2328-9754; W-8924-2019; AAH-1812-2021; JJY-2268-2023Novel 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.Publication Synthesis and surface characterization studies of polyether-linked symmetric higher sulfanyl-1,3,4-oxadiazoles(Taylor, 2015-09-02) Yıldırım, Ayhan; Öztürk, Serkan; YILDIRIM, AYHAN; ÖZTÜRK, SERKAN; Fen Edebiyat Fakültesi; Kimya Bölümü; 0000-0002-2328-9754; 0000-0002-9396-1403; W-8924-2019; AAH-1812-2021The synthesis and the characterization of a series of novel symmetric double length alkyl-chained sulfanyl-1,3,4-oxadiazoles functionalized with a polyether head group are reported. In addition, surface characterization studies were conducted on the metal surface of these synthesized compounds. The metal surfaces were characterized by contact angle measurements via the sessile-drop method, and 3D images of the metal surface were obtained using an optical profilometer. The surface studies showed that the inhibitor molecule increases the hydrophobic character and decreases the wettability of the metal surface.Publication An efficient Ni(II) laurate promoted heterocyclization of symmetrical thioureas with maleic anhydride and mechanistic approach toward higher substituted thiazolidine-4-one-5-acetic acids(Wiley, 2022-07-14) Yıldırım, Ayhan; Öztürk, Serkan; YILDIRIM, AYHAN; ÖZTÜRK, SERKAN; Fen Edebiyat Fakültesi; Kimya Bölümü; 0000-0002-2328-9754; AAH-1812-2021; W-8924-2019For the first time, readily available Ni(II) laurate catalyzed thia-Michael addition of symmetrical N,N-disubstituted thioureas to maleic anhydride and subsequent cyclization in toluene afforded novel thiazolidine-4-one-5-acetic acids with good yields in a short reaction time. The efficiency and low cost of the renewable, eco-friendly laurate based homogenous Lewis acid catalyst and the fact that cyclization proceeds in a much shorter time means that this synthetic method is interesting from a green chemistry point of view. The catalyst can be reused for many times without any significant loss of activity.Publication Synthesis of di- and tricationic surfactants and comparison of their activity on oxidation of metal in hcl media(Maik Nauka/interperiodica/springer, 2023-11-02) Öztürk, Serkan; ÖZTÜRK, SERKAN; Gültekin, Zafer; GÜLTEKİN, ZAFER; Akgül, Gülsen; Alper, Mürsel; ALTINÖLÇEK GÜLTEKİN, NURAY; ALPER, MÜRSEL; Fen Edebiyat Fakültesi; Psikoloji BölümüIn this study, two surfactants with the same long chain were synthesized. One shows dicationic and the other tricationic properties. Various spectroscopic methods such as FT-IR, H-1 NMR and C-13 NMR were used to confirm the structures of the synthesized surfactants. The inhibition activities of two synthesized surfactants against mild steel corrosion in 1.0 M HCl solution were determined using the weight loss method. The 24-h corrosion tests on metal coupons immersed in acidic solutions were carried out using different inhibitor concentrations and similar and successful inhibition was obtained for both surfactants. Current density was determined by potentiodynamic polarization at a single inhibitor concentration to compare with the inhibition efficiency results obtained by decrease in weight method. Based on the current density, the inhibition efficiencies of the surfactants were calculated by Tafel extrapolation method. The inhibition efficiency results obtained by both weight loss and Tafel method were close and consistent. According to both methods, the corrosion inhibition of dicationic surfactant was slightly better than that of tricationic surfactant. By determining the critical micelle concentration for the two surfactants, some physicochemical parameters such as surface tensions and free energy of micelle formation at this concentration were calculated and correlated with their corrosion inhibitory activity. Scanning electron microscopy was used to ascertain the surface roughness conditions of metals submerged in an acidic solution, thus visually proving that surfactants protect the metal surface from corrosion.Publication Synthesis, characterization, and studies of the interfacial and anticorrosion properties of a ternary cationic ionic liquid on carbon steel in a molar concentration of hydrochloric acid: Experimental and computational insights(Elsevier, 2023-11-17) Gerengi, Hüsnü; Solomon, Moses M.; Gece, Gökhan; Olasunkanmi, Lukman O.; ÖZTÜRK, SERKAN; Yıldırım, Ayhan; YILDIRIM, AYHAN; Fen Edebiyat Fakültesi; Kimya BölümüCorrosion in acidic environments is a serious industrial challenge that must be addressed and cationic ionic liquid play a critical role in tackling the wet corrosion menace for the metal industry. For this purpose, a novel ternary cationic ionic liquid namely N1-(3-(11-(octadecyldimethylammonio)undecanamido)propyl)-N1,N1,N2,N2,N2pentamethylethane-1,2-diaminium tribromide (Mono-18-11-di-N) is synthesized and elucidated for anticorrosion activity on St37-2 grade steel in a molar concentration of hydrochloric acid medium. The structural elucidation of Mono-18-11-di-N was achieved by FT-IR, 1H NMR, and 13C NMR methods while the electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), dynamic-EIS, density functional theory (DFT) calculations, and Monte Carlo (MC) simulation techniques were adopted in the anticorrosion evaluation. The Critical Micelle Concentration (CMC) of Mono-18-11-di-N is 0.000491 M and at CMC, the surface tension is 21.86 dyn cm 1 inferring good surface activity properties. Mono-18-11-di-N is effective against the wet corrosion of St37-2 steel. It can, at 20 mg/L decrease the corrosion rate of the metal from 0.57 mm/y to 0.11 mm/y and enhance the polarization resistance from 363 omega cm2 to 1908 omega cm2. A corrosion rate of 0.03 mm/ y and an inhibition efficiency of 93% is achievable after 24 h of immersion at 25 degrees C. Additionally, surface morphological examination using scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), optical profilometer (OP), and atomic force microscope (AFM) methods prove the adsorption of Mono -18-11-di-N molecules on the substrate surface. Moreover, DFT and MC simulations revealed that Mono-18-11-di -N relies on lone pairs of electrons in bromide anion, oxygen, and nitrogen atoms to adsorb parallel to the St37-2 surface and protect it against corrosion.Publication Newly synthesized pyridinium salt based tricationic surfactants as corrosion inhibitor for carbon steel in 1.0 m hcl medium(Maik Nauka/interperiodica/springer, 2023-09-13) Gece, Gökhan; Gerengi, Hüsnü; Öztürk, Serkan; ÖZTÜRK, SERKAN; Yıldırım, Ayhan; YILDIRIM, AYHAN; Fen Edebiyat Fakültesi; Kimya Bölümü; 0000-0002-2328-9754; 0000-0002-9663-4264; W-8924-2019; AAH-1812-2021Two 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.