Browsing by Author "Küçük Y."

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    Investigation of tribological properties of polypropylene (PP)—Acrylonitrile butadiene styrene (ABS) blends reinforced with graphene nano-platelets (GNPs)
    (Elsevier Ltd, 2023) Karteri̇ İ.; Öge M.; Küçük Y.; Özdemi̇r Öge T.; Özdemi̇r F.B.; Karataşlı M.; Çulha M.A.; Babacan T.
    The tribological response of PP-ABS/GNPs nanocomposites fabricated via extrusion and injection molding with varying wt% GNPs fractions were examined under varying normal load and sliding speed wear test parameters. The specimens with 3% GNPs and 11% GNPs respectively exhibited the lowest and highest specific wear rates and COF under all test conditions. Increased load led to significantly reduced COF values, whereas increased sliding speed led to a slight reduction in COF by contributing to the formation of a continuous transfer layer. Addition of GNPs helped to retain the worn material on the contact surface and led to improved wear resistance up to the weight fraction of 3% after which non-homogeneous dispersion of GNPs occurred. © 2023 Elsevier Ltd
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    Electrochemical determination of dopamine by poly (methyl orange) shape memory alloy modified carbon paste electrode
    (Elsevier B.V., 2024) Rajendrachari S.; Altaş E.; Erdogan A.; Küçük Y.; Gök M.S.; Khosravi F.
    We have successfully prepared 50Ni-30Ti-20Hf shape memory alloy powders using a high-energy planetary ball mill for 20 h by wet milling. The fabricated shape memory alloy powders were characterized by X-ray diffraction (XRD), and scanning electron microscope (SEM) to investigate the phases present and the morphology of the powders respectively. The use of 50Ni-30Ti-20Hf (nitinol) shape memory alloy powders as electro-catalytic materials is a unique and new idea. We are the first researchers to use nitinol powders as dopamine (DA) electrochemical sensors. For better electrochemical oxidation and higher current response of DA, we have electro-polymerized the surface of nitinol-modified carbon paste electrode (MCPE) with methyl orange (MO). Using poly(MO)-NiTiHf-MCPE, we have determined the DA using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) respectively. The calculated active surface area for BCPE, NiTiHf-MCPE, and the poly(MO)-NiTiHf-MCPE were found to be 0.044, 0.089, and 0.098 cm2 respectively. The electro-polymerized nitinol MCPE not only increased the surface area but also increased the electron transfer kinetics. Our results confirmed the participation of 2 electrons and 2 protons in the electrochemical redox reaction. © 2024 Elsevier B.V.