Yazar "Bedeloglu, Ayse Celik" seçeneğine göre listele

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    Detecting acetone from breath using a PrFeO3-doped PANi/TiO2-coated PAN nanofiber sensor for non-invasive diabetic diagnosis
    (2023) Yesildag, Nesibe; Ünsal, Ömer Faruk; Gömeç, Ramazan; Bedeloglu, Ayse Celik
    Polyacrylonitrile (PAN) nanofibers doped with varying concentrations of perovskite praseodymium ferrite (PrFeO3) nanoparticles synthesized by calcination were successfully manufactured using a simple electrospinning process. The nanofibers were coated with layers of polyaniline-titanium dioxide (PANi-TiO2) combination using an air brush. The structure, morphology, and electrical characteristics of the nanoparticles and nanofibers were characterized by SEM, FT-IR, and electrical measurement methods. The results indicated that the produced nanofibers exhibited a strong in vitro interaction and selectivity against acetone gas, a biomarker of diabetes. Perovskite nanoparticle doped PAN nanofibers have shown approximately 43% change in resistance with acetone gas exposure. These findings suggest that PrFeO3-doped nanofibers hold promise as potential candidates for acetone gas sensors in non-invasive diabetes monitoring.
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    Development of wearable photovoltaic textile and electro-optical analysis
    (Taylor & Francis Ltd, 2025) Tacer, Buket Turak; Bedeloglu, Ayse Celik; Selbas, Resat
    In this study, photovoltaic textile structures were obtained by applying organic solar cell materials to flexible structures and textiles. For this purpose, materials suitable for flexible structures were optimized as the bottom electrode (anode) to replace ITO (indium tin oxide), and the most efficient bottom electrode was used in solar cell fabrication. ITO-coated PET (polyethylene terephthalate), PET, and textile/PET carrier layers were used as flexible structures. The photovoltaic properties of the obtained flexible structures were compared with those of solar cells made from rigid layers such as FTO (fluorine doped tin oxide) coated glass and standard glass.
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    Electromagnetic interference shielding, mechanical, and flame retardant behaviors of Ti3C2Tx-MXene/glass fabric epoxy hybrid composites
    (Elsevier Science Sa, 2024) Yilmaz, Ayten Nur Yuksel; Bedeloglu, Ayse Celik; Yunus, Doruk Erdem
    This study investigates the manufacturability and electromagnetic shielding effectiveness (EMI-SE) of Ti3C2Tx/ MXene-coated glass fabric laminated composites for aerospace applications. MXene-coated fabrics were produced using a dip-coating method. The effects of varying dipping counts (5 and 10) and different configurations of fabric arrangements on the EMI-SE of the composites in the X-band range (8.2-12.4 GHz) were investigated. Glass fabrics with 5 and 10 dips showed average surface resistances of 38.56 Omega/sq and 23.17 Omega/sq, respectively. In both the 5- and 10-dip composite sets, the total EMI-SE increased with the number of MXene-coated glass fabric layers in the composite. The 5MXC5 and 10MXC5 specimens, with conductive fabric in all layers, had average total shielding effectiveness (SET) of -18.75 dB and -23.21 dB, respectively. These values are 147.05 % and 205.80 % higher than the neat glass fiber-epoxy composite (C1). Flammability, bending, ILSS, and hardness tests were conducted on these composites. Increasing the MXene content reduced the burning rate, with 10MXC5 exhibiting a 26.31 % lower burning rate compared to C1. However, higher MXene content slightly decreased bending and ILSS values. Optical microscope examination of the fracture surfaces revealed that this decrease was due to delamination damage.
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    Enhancing mechanical and flame retardant characteristics of glass fiber-epoxy laminated composites through MXene and functionalized-MXene integration
    (Elsevier, 2024) Yilmaz, Ayten Nur Yuksel; Bedeloglu, Ayse Celik; Yunus, Doruk Erdem
    MXene, a 2D transition metal carbide and nitride with graphene-like layered structures, has become one of the preferred choice for nano-reinforcement in polymer matrix composites in recent years due to its outstanding properties such as specific surface area, excellent thermal and mechanical characteristics, and high conductivity. In this study, the glass fiber-epoxy laminated composites reinforced with Ti3C2Tx-MXene (M)/ functionalizedMXene (FM) were produced using the hand lay-up procedure followed by vacuum bagging process. The effects of varying filler amounts (0.125, 0.25, 0.375, and 0.5%) on the mechanical and flame retardancy properties of glass fiber-epoxy composites were examined. In both M and FM reinforced composites, the highest values of mechanical strengths were obtained with a 0.25% filler, while a decrease in mechanical strengths was observed beyond this reinforcement amount. The 0.25 wt% FM-reinforced composite exhibited 19.21%, 27.55%, and 12.40% higher tensile, flexural, and interlaminar shear strengths (ILSS) than the pristine glass fiber-epoxy composite (N-C). Post-test analysis revealed the presence of matrix cracks, fiber breakage, and fiber pull-out damages were observed on the surfaces of composite samples. The flame retardant properties of the composites were enhanced with the addition of MXene reinforcement, and 0.5FM-C exhibited 25.50% lower burning rate than N-C.
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    Strategic Solvent System Tuning for the Development of PVDF and TPU Nanofibers
    (2024) Ünsal, Ömer Faruk; Bedeloglu, Ayse Celik
    In this study, we have achieved the successful fabrication of polyvinylidene fluoride (PVDF) and thermoplastic polyurethane (TPU) nanofiber samples. The key element of our investigation revolved around the manipulation of solvent systems, specifically by varying the dimethyl formamide (DMF) to acetone ratio. Our primary objective was to explore the intricate interplay between the chosen solvent system and the resultant fiber morphology. To accomplish this, we employed a multifaceted approach, which encompassed the utilization of scanning electron microscopy (SEM) to provide a comprehensive visual representation of the nanofiber structures and dimensional measurements to quantify their physical attributes. Furthermore, fourier-transform infrared (FT-IR) spectroscopy was employed to delve into the molecular-level alterations induced by the solvent systems on the macromolecular morphology of the polymer nanofibers. This systematic examination not only contributes to a deeper understanding of the nanofiber fabrication process but also holds significant potential for various applications in the realm of materials science and nanotechnology.
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    The effect of MXene on the mechanical and electromagnetic interference shielding features of carbon fabric/epoxy scalable laminated composites
    (Springer, 2025) Yuksel Yilmaz, Ayten Nur; Bedeloglu, Ayse Celik; Yunus, Doruk Erdem
    In this study, the aim was to improve the interfacial properties of carbon fabric-epoxy matrix composites using MXene, a 2D material with superior characteristics, as a reinforcement. To achieve this, carbon fabrics were first surface-activated using concentrated nitric acid, followed by spraying a solution containing MXene in varying weight percentages (0.2%, 0.4%, and 0.8%). Subsequently, epoxy matrix-based laminated composites were fabricated using the vacuum infusion method. The composites were then subjected to tensile, flexural, interlaminar shear strength (ILSS), Mode-I fracture toughness, and electromagnetic interference (EMI) shielding tests. The results showed that the composite reinforced with 0.4% MXene exhibited the highest mechanical performance, demonstrating increases of 12.71%, 12.63%, and 13.13% in flexural strength, ILSS, and tensile strength, respectively, compared to the reference carbon fabric-epoxy composite. Additionally, the Mode-I fracture toughness of this composite was improved by 25.32%. Scanning electron microscopy (SEM) analysis was conducted to examine the fracture regions of the composites and ascertain the underlying damage mechanisms. The increase in the amount of MXene coated on the fabric surface did not create a significant difference in the EMI-SE values of the composites in the X-band range. The total shielding effectiveness values of the CF, ACF, 0.2MX, 0.4MX, and 0.8MX samples were calculated as - 31.13 dB, - 31.39 dB, - 31.45 dB, - 32.77 dB, and - 32.63 dB, respectively. These findings demonstrate that MXene is an effective reinforcement for improving the interfacial properties of laminated composites for scalable production.
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    The flexural and compressive properties of sandwich composites with different 3D-printed core structures
    (2024) Caran, Rabia; Yılmaz, Ayten Nur Yüksel; Ercan, Necati; Yunus, Doruk; Bedeloglu, Ayse Celik
    In this study, different core structures are produced with polylactic acid (PLA) and carbon fiber reinforced PLA (CFR-PLA) filaments using a 3D printer with fused deposition modeling (FDM) technique. An alternative new core structure is proposed to the honeycomb and square core structures commonly used in the literature. Then, sandwich composites are produced by bonding carbon fiber-epoxy plates to the lower and upper surfaces of these core structures. The effect of carbon fiber reinforcement and core types on the mechanical properties of sandwich composites was investigated. The core structures produced with carbon fiber-reinforced PLA showed lower compressive strength but higher compressive modulus than those produced with pure PLA. Among the core structures, the designed structure showed the highest compressive strength with a value of 9.867 MPa, which is 32.18% and 54.36% higher than the honeycomb and square structure. While the flexural strength and flexural stiffness of the sandwich composites increased with carbon fiber reinforcement, the designed sandwich composite showed approximately 1.40 and 3.15 times the flexural strength of the honeycomb and square sandwich composites, respectively.
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    Thermoplastic vulcanizate (TPV) hose development for fluid transfer systems of next generation vehicles
    (2025) Bek, Hande; Bedeloglu, Ayse Celik
    Electrification, weight reduction, sustainability, and carbon emissions reduction goals have gained significant importance in the automotive sector over the past decade. In the context of fluid transfer systems, thermoplastic vulcanizate (TPV) hoses offer various advantages compared to rubber hoses. TPV hoses contribute to weight reduction, being approximately 40% lighter, and exhibit sustainable characteristics due to their reprocessable nature. Moreover, they result in lower carbon emissions throughout the production and recycling cycles. Cost-wise, TPV hoses are advantageous, with improvements ranging from 40% to 55% compared to rubber hoses, making them suitable for the development and production of new automotive components. This research investigates the utilization of TPV, a member of the high-performance materials and technologies category, with a particular emphasis on its application in the automotive sector, specifically in the development and manufacturing of TPV hoses. The enhancement of polymer composites and manufacturing methods will contribute to the establishment of suitable techniques for mass production and to enhance the mechanical, thermal, and chemical stability of TPV hoses. Additionally, this study aims to target the production of reinforced automotive cooling hoses made from TPV as a competitive and sustainable alternative for next-generation vehicles. An assessment of the impact of TPV hoses on vehicles and sustainability strategies will be conducted, comparing them to EPDM hoses.