Yazar "Aksu Canbay, Canan" seçeneğine göre listele

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    Optical and electrical characterization of the metal oxide composites by hydrothermal method
    (Aksaray Üniversitesi, 2019) Aksu Canbay, Canan; Hamad, Rekawt Khdir; Özkul, İskender
    Metal oxide and metallic composites are commonly used in material science. Oxides can perform different physical features by small shift during synthesis. That commonly tends innovative results. In this study copper phthalocyanine based four different composite semiconductor materials fabricated by hydrothermal method. The samples were analyzed by optical and electrical characterization measurements. Reflectance, band gap values and conductivity results obtained and presented as graphics with discussion.
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    Shape memory alloys phenomena: classification of the shape memory alloys production techniques and application fields
    (Springer, 2019) Özkul, İskender; Kurgun, Mehmet Ali; Kalay, Ece; Aksu Canbay, Canan; Aldaş, Kemal
    The shape memory alloy, referred to as the material of the future, is the first to come to mind in the class of smart materials. Shape memory alloys are already present in many important areas. In the medical field, glasses frame material, the material of intravenous stents, jet engines in the aviation area, and bridges in the construction area can be mentioned. Although the shape memory effect is found in different material types such as ceramics and polymer, shape memory alloys are the most commonly used among these materials. The atomic-bond types of the alloys provide long-lasting and durable properties compared to other material types. The extraordinary mechanics of solid-state transformation and the kinematics of the bonds between atoms exhibit a unique nature formation. Discovered too late in the history of humanity, this feature changed the material understanding of the last 80 years and enabled industrial application to have a very important function coming from intelligent material types. In this study, a detailed study on the mechanical characterization of shape memory alloys in microstructure, types of shape memory effect, shape memory alloy, phase transformations and applications are presented.
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    Sodium-induced phase shift in α-NaMnO2 and electrochemical properties of the full cells using hard carbon anodes derived from regional olive leaves
    (Springer, 2025) Doğan, Ebru; Özcan, Sibel; Aksu Canbay, Canan; Karta, Mesut; Depci, Tolga; Altın, Serdar
    In this study, we investigated the effect of excess sodium (Na) in a NaMnO2 structure using one-step heat treatment at 900 °C followed by quenching in liquid nitrogen (N₂). According to the X-ray diffraction (XRD) analysis, there was a competition between the monoclinic and orthorhombic phases, and we found that there were two monoclinic phases with similar structural properties. Therefore, we focused on revealing the formation of two isostructures of the monoclinic phase triggered by Na ions. We found that the lattice parameters and β angle changed from 113° to 105° in the samples with increasing Na content. Structural analysis of the powders using the XRD data was conducted using Rietveld refinement, and the phase ratios for all samples were calculated. The sample with x = 1.3 showed a 95% α-phase. To understand the formation of the two isostructures, we performed Density functional theory (DFT) calculations to examine their band structure, stability, and formation energy. A structural analysis of the excess Na-doped samples was performed using common techniques, and it was found that excess Na caused the formation of a coating on the grains in the form of sodium oxide. To validate this prediction, we conducted inductively coupled plasma mass spectrometry (ICP-MS), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy coupled with energy dispersive X-ray (SEM–EDX) analyses using the basic properties of these techniques and their interactions with materials. In the second part of the study, we produced HC from locally sourced olive leaves and investigated their structural properties. The electrochemical properties of the electrode materials were examined using a half-cell configuration as electrodes with Na metal and a full-cell configuration using x = 1.3 cathode and HC anode. A direct-contact pre-sodiation strategy was used as the anode in the full-cell measurements. It was found that the full cells had initial capacity values of 150 mAh/g for the voltage range 1.5–4.3 V and 120 mAh/g for the voltage range 1.5–3.5 V.