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    A thorough examination of gadolinium (III)-containing silicate bioactive glasses: synthesis, physical, mechanical, elastic and radiation attenuation properties
    (Springer Science and Business Media Deutschland GmbH, 2022) Deliormanlı, Aylin M.; Ensoylu, Mertcan; Issa, Shams A.M.; Rammah, Y.S.; Almisned, Ghada; Tekin, Hüseyin Ozan
    Gadolinium (III)-containing (1, 3 and 5 wt.%) silicate-based bioactive glass powders were synthesized by sol–gel method and subsequently die pressed to fabricate disc-shape glass samples. Sintering was performed at 690 °C for 1 h in air atmosphere. Physical, structural, and mechanical properties (compressive strength and Vickers hardness) of the fabricated glass pellets were investigated. Results showed that prepared glass samples were amorphous after sintering and any detrimental effect of Gd2O3 was not observed on the densification. An increase in bulk density and in compressive strength was obtained as the gadolinium (III) concentration was increased. On the other hand, a significant influence of the rare-earth element on the Vickers hardness was not seen. For the sample containing gadolinium (III) at highest concentration, Vickers hardness was measured to be 3.25 ± 0.23 GPa. Our findings indicate that increasing the quantity of Gadolinium (III) significantly affects the gamma-ray attenuation qualities of bioactive glass samples. The addition of Gadolinium (III) improved the attenuation qualities of the bioactive glass samples across a broad energy range. As a result, it can be concluded that Gadolinium (III) and its monotonic effect may be used to modify the basic features of bioactive glass samples. In addition, it can be concluded that this monotonic effect may be employed to optimize the circumstances of use of associated bioactive materials based on their requirements in medical and engineering applications. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
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    Two-dimensional molybdenum disulfide/polymer-coated bioactive glass scaffolds for tissue engineering: Fabrication, structural, mechanical, bioactivity, and radiation interaction properties
    (Elsevier Sci Ltd, 2023) Deliormanli, Aylin M.; Ensoylu, Mertcan; ALMisned, Ghada; Tekin, H. O.
    Molybdenum disulfide (MoS2)-based nanostructures are widely used in environmental protection and biomedicine owing to their biological, physical, chemical, electrical, and mechanical properties. In this study, polycaprolactone (PCL)- and polylactide-co-glycolide (PLGA)-coated bioactive glass scaffolds containing MoS2 nanoparticles are prepared, and their usability in bone tissue engineering applications is evaluated. Borate bioactive glass scaffolds are fabricated using the replication method and coated with PCL or PLGA solutions (5 wt %) containing MoS2 (0.1, 0.2, 0.5, 1, and 2 wt%) nanoparticles. The structural and mechanical properties of the scaffolds and their bioactivity in simulated body fluids are investigated comprehensively. The ionization-radiation-shielding properties are investigated using Monte Carlo simulations. The results show that the polymer coating layer and presence of MoS2 nanoparticles in the polymer matrix improves the mechanical properties of the scaffolds. The addition of MoS2 nanoparticles to the structure increases the hydroxyapatiteforming ability of bioactive glass-based composites. Additionally, the prepared composite scaffolds exhibit high radiation-shielding ability owing to the presence of MoS2 nanoparticles embedded in the polymer matrix that shields the glass surface. Bioactive glass composite scaffolds containing MoS2 nanoparticles demonstrate promising potential for bone regeneration and radiation-shielding applications.