Yazar "Seydibeyoglu, M. Ozgur" seçeneğine göre listele

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    Aviation: Thermoplastic and Thermoset Polymers in
    (Crc Press-Taylor & Francis Group, 2019) Seydibeyoglu, M. Ozgur; Erdogan, Fatma; Alyamac, Elif
    This chapter presents a review of polymers and composites used in the aviation industry with new developments and standard protocols. This chapter will enable the readers to understand the aviation industry from a polymer and materials science perspective. It helps to understand the rapid growth of the aviation industry with high demand of lightweight structures. the chapter deals with all aspects of polymers including thermoplastics, thermosets, and composites. Qualification tests and some tests are given to get a better understanding of polymeric materials used in the aviation industry. Finally, some recent new developments are presented with a futuristic outlook.
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    The effect of printing parameters on the mechanical properties of fiber-reinforced PA6 matrix composites in material extrusion-based additive manufacturing
    (Emerald Group Publishing Ltd, 2024) Dogru, Alperen; Seydibeyoglu, M. Ozgur
    PurposeThis study aims to understand the effect of the use of different proportions and types of fibers in the polyamide 6 (PA6) matrix during material extrusion-based additive manufacturing (MEX) and the effect of the manufacturing parameters on the mechanical properties. The mechanical, thermal and morphological properties of PA composites that are reinforced with carbon fiber (CF), glass fiber (GF) and as well as hybrid fiber (HF) were investigated.Design/methodology/approachIn this study, the effect of nozzle temperature and layer thickness on the mechanical properties of composite samples was investigated in terms of their behavior under tensile, impact and compression loads, manufacturing parameters as well as fiber ratio and type. The results were also consolidated by scanning electron microscopy.FindingsAt 20 Wt.% CF reinforcement PA6 samples, a tensile strength value of 125 MPa was obtained with a 60% increase in tensile strength value compared to neatPA6. The HF-reinforced ones also measured a tensile strength value of 106.69 MPa. This corresponds to an increase of 38% compared to neatPA6. The results also show that HF reinforcement can be an important component for many composites and a suitable material for use under compression loading.Originality/valuePA6, an engineering polymer, can be produced by MEX, which offers several advantages for complex geometries and customized designs. There are studies on different carbon and GF ratios in the PA6 matrix. Using these fibers together in a HF, the examination of their mechanical properties in the MEX method and the examination of the effect of GF reinforcement in the hybrid structure, which has a cost-reducing effect, has been an innovative approach. In this study, the results of the optimization of the parameters affecting the mechanical properties in the production of samples reinforced with different ratios and types of fibers in the PA6 matrix by the MEX method are presented.
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    Electrochemical Detection of a Cancer Biomarker mir-21 in Cell Lysates Using Graphene Modified Sensors
    (Wiley-V C H Verlag Gmbh, 2015) Kilic, Tugba; Erdem, Arzum; Erac, Yasemin; Seydibeyoglu, M. Ozgur; Okur, Salih; Ozsoz, Mehmet
    In the present study, the voltammetric and impidimetric detection of microRNA-21, mir-21 from cell lysates was investigated for the first time by using graphene modified disposable pencil graphite electrodes (GME). The surface characterization of GME was performed via electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Upon passive adsorption of inosine substituted antimicroRNA-21, antimir-21 probe, InP, onto the surface of GME and then solid phase hybridization of InP with mir-21, the target, the electrochemical detection was performed by using Differential Pulse Voltammetry (DPV) and EIS techniques. This developed biosensor, GME has presented a 2.77 times lower detection limit of 2.09 mg/mL (3.12 pmol) with respect to unmodified pencil graphite electrode (GE). Moreover it is capable of analyzing mir-21 in the cell lysates of mir-21 positive breast cancer cell line (MCF-7) contrast to mir-21 negative hepatoma cell line (HUH-7). The proposed electrochemical yes-no system does not require any purification and/or amplification step prior to fast detection of mir-21 from real samples.
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    Natural Fiber Reinforced Polyurethane Rigid Foam
    (Gazi Univ, 2017) Demiroglu, Sibel; Erdogan, Fatma; Akin, Ecem; Karavana, Huseyin Ata; Seydibeyoglu, M. Ozgur
    The main objective of this study was to prepare polyurethane foam reinforced with local Turkish natural resources. In this work, olive kernel and nutshell fibers were used for reinforcing the polyurethane foam. In order to characterize reinforced polyurethane samples, mechanical, chemical, thermal, and morphological methods were used. Mechanical properties of polyurethane foam were measured by compression test. With compression test, it was observed that compressive strength of polyurethane foam was increased with 2.5 wt % olive kernel. Functional groups of polyurethane foams were determined by Fourier Transform Infrared Spectroscopy. Thermal behavior of polyurethane foam was analyzed with thermogravimetric analyzer device. Among biocomposites, polyurethane foam filled with nutshell indicated higher thermal degradation than polyurethane foam filled with olive kernel. Scanning electron microscopy observations revealed that foam structure was formed with biofiber addition.
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    Valorization of waste Ti6Al4V chips for epoxy composite production: A circular economy approach
    (Wiley, 2024) Teke, Erdogan; Alyamac-Seydibeyoglu, Elif; Mocan, Merve; Seydibeyoglu, M. Ozgur
    With increasing awareness of the circular economy, utilizing waste materials from titanium alloys for polymer composites offers numerous advantages. In this study, medical-grade titanium alloy, Ti6Al4V chips were finely ground and mixed with epoxy resin to produce particulate-reinforced composites. The tensile strength showed a 32% improvement compared to the neat epoxy. Similar results were observed for the flexural test, showing a 36% improvement in the composites. Moreover, a substantial 96% increase in thermal conductivity was observed, significantly expanding the potential application areas for the epoxy-based composites. These improvements were achieved without the use of superfine nanoparticles or other expensive additives. This underscores the potential of a circular approach in the materials world, offering many new opportunities while promoting sustainability.