Person: ERYILMAZ, OĞUZ
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ERYILMAZ
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OĞUZ
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Publication Metadata only Effect of silane coupling treatments on mechanical properties of epoxy based high-strength carbon fiber regular (2 x 2) braided fabric composites(WILEY, 2021) SANCAK, ERHAN; Eryilmaz, Oguz; Sancak, ErhanBraiding technique is one of the most cost-effective and versatile methods to manufacture braided preforms for producing textile reinforced composites. Carbon fiber is one of the most common reinforcing fibers having high strength and modulus used in high-performance composites. In this study, epoxy resin was modified with 3-aminopropyltriethoxysilane (APTES) and 3-aminopropylmethyldimethoxysilane (APMDMS) in order to enhance interfacial adhesion between matrix and carbon fiber. Composites were produced by vacuum-assisted resin infusion method using braided fabrics which were manufactured from a high-strength standard modulus type of carbon fiber (T700S) by using a radial braiding machine. Epoxy resin was treated with silane at different concentrations from 0.0% to 1.0%. According to the mechanical results, the ideal (optimum) concentration of APTES and APMDMS for the matrix modification has been around 0.5 wt% of the epoxy system. Also, the mechanical properties of APTES-treated epoxy composites are slightly higher than those of APMDMS-treated epoxy composites at the same concentration. When it is compared to silane untreated composite, 0.5 wt% of APTES/APMDMS silane treated epoxy/carbon braided composites have led to an increase of 7.71/6.16% and 7.65/6.05% in tensile and flexural strength while the corresponding increase has resulted in 17.48/13.51% and 16.63/13.33% in terms of tensile and flexural modulus, respectively. Impact testing results indicate that 0.5 wt% of APTES and APMDMS composites are improved 6.87% and 4.31% compared to untreated composites, respectively.Publication Metadata only Inline contactless optical measuring of glass fiber properties and retrofitting an adaptive cooling system for glass fiber production(2022-10-17) DOĞAN, BARIŞ; ERYILMAZ, OĞUZ; Eberhardt B., Akdere M., Doğan B., Eryılmaz O.Various reinforcing materials are used for fiber-reinforced plastics or composites, e.g. glass fibers, carbon fibers or natural fibers. In terms of volume, glass fiber reinforced plastics (GRP) dominate the composites market with a share of approx. 95% of the total market volume [1]. Glass fibers, along with carbon fibers, are thus the most important fibers in the global economic market. In conventional glass fiber production, the individual filaments are cooled as quickly as possible after leaving the bushing to prevent crystallization of the glass and thus achieve high tensile strength. In more modern plants, cooling fins are often used for this purpose. These are brought as close as possible to the heated bushing (approx. 1250 °C) to cool the exiting glass as quickly and efficiently as possible. The flow rate of the coolant is usually only adjusted manually and not actively controlled. As a result, homogeneous cooling over the entire bus ring surface is not possible and the individual filaments exhibit a higher dispersion in their mechanical properties. The aim of the GLASSCOOLER project is to develop a new system component for active cooling of the individual filaments and the necessary measurement and control units. By optically measuring all fibers during solidification and adaptively controlling the cooling, it is possible to reduce the variation in mechanical properties across all filaments and thus achieve higher overall strength. In addition, documentation of fiber properties during the manufacturing process is enabled and quality checks are automated.Publication Metadata only Evaluation of the interaction between proliferation, oxidant-antioxidant status, Wnt pathway, and apoptosis in zebrafish embryos exposed to silver nanoparticles used in textile industry(WILEY, 2018) ALTURFAN, EBRU IŞIK; Eryilmaz, Oguz; Ates, Perihan Seda; Unal, Ismail; Ustundag, Unsal Veli; Bay, Sadik; Alturfan, Ahmet Ata; Yigitbasi, Turkan; Emekli-Alturfan, Ebru; Akalin, MehmetAntimicrobial textile products are developing rapidly as an important part of functional textiles. Silver nanoparticles (AgNPs) are nanotechnology products with antimicrobial properties. However, exposure to nanoparticles in daily life is an important issue for public health, still being updated. Aim was to evaluate the effects of AgNPs on the development of zebrafish embryos focusing on Wnt pathway, proliferation, oxidant-antioxidant status, and apoptosis. The expressions of ccnd1 and gsk3 beta were determined by RT-PCR, whereas beta-catenin and proliferative cell antigen (PCNA) expressions were determined immunohistochemically. Lipid peroxidation, superoxide dismutase, and glutathione-S-transferase activities were determined spectrophotometrically. Apoptosis was determined using acridine orange staining. Oxidant status, apoptosis, immunohistochemical PCNA, and beta-catenin staining increased, whereas ccnd1 and antioxidant enzyme activities decreased in AgNPs-exposed embryos in a dose-dependent manner. Our results indicate the interaction of possible mechanisms that may be responsible for the toxic effects of AgNPs in zebrafish embryos.Publication Metadata only Preimpregnated natural fiber preforms(Elsevier Science, Oxford/Amsterdam , 2023-06-01) YILDIZ, ZEHRA; ERYILMAZ, OĞUZ; Yildiz Z., Eryilmaz O.Publication Metadata only Braided natural fiber preforms(Elsevier Science, Oxford/Amsterdam , 2023-06-01) ERYILMAZ, OĞUZ; SANCAK, ERHAN; Eryilmaz O., Sancak E.Publication Open Access Sustainable fabric printing by using pre-consumed cellulosic textile wastes: The effect of waste particle content(2024-04-05) YILDIZ, ZEHRA; KARTAL, İLYAS; KOÇAK, EMİNE DİLARA; ERYILMAZ, OĞUZ; YILDIZ Z., KARTAL İ., KOÇAK E. D., Ozer B., Kus B. N., ERYILMAZ O.The textile industry generates significant amounts of waste, including yarn/fiber fluffs, fabric scraps, offcuts, etc. These wastes can be recycled and repurposed for usage in screen printing which is a versatile and cost-effective printing technique by producing high-quality prints. In this study, pre-consumed colored cotton wastes were milled into 30–70 μm particle size by using a miller. Then the colored waste particles were included in a commercial printing paste and applied on cotton fabrics via screen printing. Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analysis, and energy dispersive spectrometer (EDS) were employed to observe the chemical changes in the printed textile fabrics. The printed fabrics were evaluated through color, wash/rub fastness, tensile strength, surface wettability, tactile, and air permeability properties. The dispersion quality of the waste particles on textile fabrics was observed by using light microscopy and scanning electron microscopy (SEM) images. The overall results demonstrate that a 10% amount of waste fibrous particle inclusion to the printing paste gave optimum results by means of dispersion quality of wastes, air permeability, and handle properties. Above 10% waste amounts, the waste particles cannot be dissipated well on the fabric surface, resulting in agglomerated and non-uniform printed areas. These findings hold substantial potential for promoting sustainable coloring applications by using colored pre-consumed textile wastes within the textile industry while maintaining high-quality fabric products.