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    Novel bionanocomposites of chitosan-based blend containing LaB6: Thermal, dielectric, and biological properties
    (Wiley, 2023) Erol, Ibrahim; Hazman, Omer; Aksu, Mecit; Uygur, Ilyas
    In the presented study, a strategy that will offer alternative usage areas by strengthening the physicochemical properties of the green polymer chitosan (CS) is aimed. For this purpose, a compatible blend of CS (CS-PFPAMA) with poly 2-(4-fluorophenyl)-2-oxoethyl-2-methylprop-2-enoate (PFPAMA), a methacrylate-based synthetic polymer, was prepared by hydrothermal method. Miscibility and compatibility of the CS-PFPAMA blend were confirmed by the single glass transition temperature (T-g) determined by differential scanning calorimetry (DSC). Then, lanthanum hexaboride (LaB6) nanoparticles (NPs) prepared by the chemical method were successfully added to the CS-PFPAMA blend at different weight ratios by hydrothermal method. Morphological characterizations of CS-PFPAMA blend and produced nanocomposites were performed with Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectroscopy, and atomic force microscopy, and thermal characterizations were made with thermogravimetric analysis and DSC. The thermal stability and T-g values of the obtained CS-PFPAMA blend and nanocomposites were lower than the values of the CS. However, LaB6 NPs increased the dielectric properties of the CS-PFPAMA blend. Thus, the potential use of the produced nanocomposites in electronic devices may be in question. According to the results of antibiogram tests performed by the disk diffusion method, it was determined that nanocomposites showed a serious resistance against Escherichia coli and Staphylococcus aureus pathogens. In addition, both antioxidant and oxidant properties of nanocomposites showed values close to the reference material used. The determined biological properties indicate that the CS-based nanocomposites can be used as biomaterials.
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    Synthesis of novel PVA-PFPAMA nanocomposites by the hydrothermal method: Evaluation of thermal, antimicrobial, and anticarcinogenic properties
    (Elsevier Science Sa, 2023) Erol, Ibrahim; Hazman, Omer; Ozkan, Mehmet; Uygur, Ilyas; Khamidov, Gofur; Gerengi, Husnu
    In this study, a mixture of poly 2-(4-fluorophenyl)-2-oxoethyl-2-methylprop-2-enoate (PFPAMA) and PVA was first prepared and characterized using the hydrothermal method. Copper (II) oxide nanoparticles (CuO NPs) prepared by solution plasma process (SPP) were hydrothermally incorporated into the PVA-PFPAMA blend at 3 %, 5 %, and 7 %. FTIR spectroscopy was used to identify the functional groups of the obtained materials. Morphological and structural analysis of the materials was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and atomic force microscopy (AFM). The glass transition temperatures (Tg) of the materials were investigated by differential scanning calorimetry (DSC), and their thermal stability by thermogravimetric analysis (TGA). All materials showed excellent antimicrobial effects against E. coli, S. aureus, and C. albicans strains. It was also found that the anticarcinogenic activity increased with the proportion of CuO NPs in the nanocomposites. The results showed that the thermal and biological properties of the nanocomposites were positively affected after the inclusion of CuO NPs in the PVA-PFPAMA blend. The synergistic effects of PFPAMA and CuO NPs improved the overall performance of the materials.