Aydogdu, Burcu; Unal, Ilkay

In this study, zinc oxide nanoparticles (ZnONPs) were synthesized using Cinnamomum verum extract from different zinc salts such as zinc acetate, zinc nitrate, zinc sulfate, and zinc chloride. The synthesized ZnONPs were characterized using X-ray diffraction (XRD), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscopy (TEM). Additionally, The photocatalytic activities of ZnO nanoparticles were tested in the presence and absence of sunlight. Cinnamomum verum extract was analyzed for DPPH radical scavenging activity and total phenolic content (TPC). The study results showed that the type of zinc salt used significantly affects the morphology, size, and crystal structure of the ZnO nanoparticles. ZnONPs synthesized from zinc acetate (ZnONPsA) showed superior photocatalytic activity in the presence and absence of sunlight.

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Simsek, Tuncay; Güler, Seval Hale

In this study, equimolar nanocrystalline Fe-Si-Cu (at.%) and Fe-Si-Nb (at.%) alloys were synthesized under an Argon atmosphere by a mechanical alloying method. Experimental parameters were determined as 350 rpm, 10:1 BPR, 120 hours. Phase structures of the synthesized alloys were investigated by X-Ray diffractometry, morphology and elemental analyzes were investigated by SEM-EDS, and magnetic properties were investigated by vibrating sample magnetometer (VSM) technique at room temperature. The crystallite size of the Fe-Si-Cu alloy was found to be 102.3, 22.5, 15.9 and 8.6 nm at the beginning of grinding, after 30, 60 and 120 hours grinding, respectively, and the lattice strains were 0.164%, 0.510%, 0.672% and 1.165%, while the Fe-Si-Cu alloy For the Nb alloy, the crystallite sizes were calculated as 140.8, 42.9, 16.8 and 7.8 nm, and the lattice strains were calculated as 0.134%, 0.301%, 0.639% and 1.271%. According to the magnetism results, the saturation magnetization (Ms) of the Fe-Si-Cu (at.%) alloy was found to be 3146 emu/g, while the saturation magnetization of the Fe-Si-Nb (at.%) alloy was found to be 8.91 emu/g. It was determined that Nb addition to the Fe-Si alloy system caused an increase in the coercivity values.

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