Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 1Citation - Scopus: 1Plasma-Enhanced Cvd Synthesis and Cytotoxic Evaluation of Graphitic Carbon Embedded – Fe3O4 Nanoparticles(Elsevier Sci Ltd, 2025) Balci-Cagiran, Ozge; Mertdinc-Ulkuseven, Siddika; Solati, Navid; Onbasli, Kubra; Yagci-Acar, Havva; Agaogullari, DuyguThis study reports the synthesis of graphitic carbon embedded - Fe3O4 nanoparticles using a novel method that enables a low-temperature rapid process and includes cytotoxicity tests to evaluate their potential use in biomedical applications. In this study, graphitic carbon was grown on Fe3O4 core using a plasma-enhanced chemical vapor deposition (PE-CVD) system under an Ar-H-2-CH4 gas plasma at 650 degrees C for 15 min. X-ray diffractometry (XRD) and Raman spectroscopy investigations confirmed that Fe3O4 nanoparticles were embedded in graphitic carbon (Fe3O4@C). Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), along with transmission electron microscopy (TEM) equipped with EDS, also supported the carbon formation and nano-sized structure of the synthesized particles. Fe3O4@C nanoparticles exhibited soft magnetic properties with saturation magnetization (M-s) and coercivity (H-c) values of 69.27 emu/g and 97 Oe, respectively. Cytotoxicity assessment on HeLa and MCF7 cancer cells suggested biocompatibility at and below a dose of 100 mu g/mL after 24 h of exposure but a drop in cell viability at higher doses and longer incubation times, more on cancer cell lines than the healthy L929 cells. These results suggest that Fe3O4@C nanoparticles might be potential candidates for biomedical applications, including drug delivery, photothermal therapy, and magnetically-triggered operations.Article Citation - WoS: 2Citation - Scopus: 4Identification of Turkish Extra Virgin Olive Oils Produced in Different Regions by Using Nmr (h-1 and C-13) and Irms (c-13/C-12)(Wiley, 2023) Sevim, Didar; Köseoğlu, Oya; Ertaş, Hasan; Özdemir, Durmuş; Ulaş, Mehmet; Günnaz, Salih; Çelenk, Veysel UmutIsotope ratio mass spectroscopy (IRMS) and nuclear magnetic resonance (NMR) spectroscopy techniques are two of the analytical methods that are used to characterize food products. The aim of this study is to classify extra virgin olive oil (EVOO) samples collected from different regions of Turkey based on H-1 and C-13 NMR spectra along with IRMS d(13)C carbon isotope ratio data by using chemometrics multivariate data analysis methods. A total of 175 EVOO samples were analyzed in 2014/15 and 2015/16 harvest seasons. Multivariate classification and clustering models were used to identify geographical and botanical origins of the EVOOs. IRMS results showed that there was no significant difference in terms of d(13)C values between the years in terms of harvest year (p > 0.05), only extraction phase and variety were statistically significant factors (p < 0.05). The interactions of the factors showed that the harvest year x variety interaction is important. The outcomes of this research clearly indicated that considering the partial least squares discriminant analysis result with NMR spectra, the percent success of the model in the South Marmara, North Aegean, and South Aegean region samples were 95%, 95.7%, and 96.4% in the model set, respectively. The results showed that by using classification and clustering models, geographic marking and labeling of these oils can be carried out regardless of differences in year and production systems (2 and 3 phase extraction system) according the NMR analysis.Article Citation - WoS: 3Citation - Scopus: 3Continuous Production of Hyperbranched Polyhydrocarbons by Electrochemical Polymerization of Chlorinated Methanes(Royal Society of Chemistry, 2022) Seo, Jae Hong; Nam, Hyun Ju; Rajendiran, Rajmohan; Seong, Won Kyung; Jiang, Yi; Kim, Min Hyeok; Büyükçakır, OnurA continuous production of polyhydrocarbon (PHC) by electrochemical polymerization of chlorinated hydrocarbons is presented. Monomer loading and product transfer were controlled by changing flow direction in a home-built continuous flow system that facilitates preparation, work-up, and scale-up of electrochemical polymerization. The polymerization can be tuned by adjusting reaction time, cell configuration, molar ratio of input chemicals, and the solvent type. CH2Cl2, CHCl3, and CCl4 were used to synthesize PHC. The reduction of the monomers at the cathode was studied by cyclic voltammetry and chronoamperometry. We investigated the structure and composition of PHCs from FT-IR and NMR spectra along with elemental analysis. Sufficient amounts of product are generated by continuous production and characterization of the product PHCs by a wide variety of methods is possible. Particularly, structural analysis by various C-13 NMR techniques suggests a new pathway for the synthesis of hyperbranched PHCs by electrochemical polymerization.Article Citation - WoS: 10Citation - Scopus: 7Assessment of Melt Cleanliness of Secondary 5000 Aluminum Alloy Via Non-Metallic Inclusions Characterization(Springer, 2023) Li, Cong; Dang, Thien; Huang, Jinxian; Huang, Chunfa; Li, Jianguo; Friedrich, Bernd; Gökelma, MertolThe extensive energy consumption of primary aluminum production stimulates increasing need of producing primary-quality alloys with secondary sources, during which process amount of non-metallic inclusions (NMIs) in the alloy must be strictly controlled. In the present study funded by AMAP Open Innovation Research Cluster, NMIs generated during remelting a 5000 Al-Mg alloy was investigated to offer benchmarking characters of NMIs with respect to type, morphology, size, composition, and concentration. Under different remelting conditions NMIs formed in the melt ahead of solidification were concentrated using Porous Disc Filtration Apparatus (PoDFA) and characterized microstructurally and quantitatively. Investigated conditions included heating cycle, organic contaminations, and refractory materials. Results suggested oxide films and cuboid particles as typical oxides with, respectively, different compositions. The amount of formed oxides declined with the increase of heating rate. With respect to aluminum carbide (Al4C3), organic contaminations were confirmed to lead to an increased amount of its formation. The carbon-containing refractory material contributed more significantly than organic contaminations on the formation of Al4C3 at melt temperatures over 760 & DEG;C. Formulas were derived based on trial results to enable translation of NMIs PoDFA value [mm(2)/kg] into their mass fraction [ppm] in the melt.