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Keywords = A-HSBS

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33 pages, 12074 KiB  
Article
PVP as an Oxygen Vacancy-Inducing Agent in the Development of Black 45S5 Bioactive Glass Fibrous Scaffolds Doped with Zn and Mg Using A-HSBS
by Keila C. Costa, Maria Geórgia da S. Andrade, Rondinele N. de Araujo, Adegildo R. de Abreu Junior, Marianna V. Sobral, Juan Carlos R. Gonçalves, Bianca V. Sousa, Gelmires A. Neves and Romualdo R. Menezes
Materials 2025, 18(6), 1340; https://doi.org/10.3390/ma18061340 - 18 Mar 2025
Cited by 1 | Viewed by 722
Abstract
Currently, there is an increasing demand for advanced materials that can address the needs of tissue engineering and have the potential for use in treatments targeting tumor cells, such as black bioactive materials in photothermal therapy. Thus, 3D fibrous scaffolds of black 45S5 [...] Read more.
Currently, there is an increasing demand for advanced materials that can address the needs of tissue engineering and have the potential for use in treatments targeting tumor cells, such as black bioactive materials in photothermal therapy. Thus, 3D fibrous scaffolds of black 45S5 bioactive glass were produced using the air-heated solution blow spinning (A-HSBS) technique, with polyvinylpyrrolidone (PVP) serving as a spinning aid and an oxygen vacancy-inducing agent. Glass powder with the same composition was synthesized via the sol-gel route for comparison. The samples were characterized using thermogravimetric analysis, X-ray diffraction, FTIR spectroscopy, and scanning electron microscopy, along with in vitro tests using simulated body fluid (SBF), phosphate-buffered saline (PBS), and TRIS solution. The results showed that PVP enhanced oxygen vacancy formation and stabilized the scaffolds at 600 °C. Doping with Zn and Mg ions reduced crystallization while significantly increasing the fiber diameters. Scaffolds doped with Zn exhibited lower degradation rates, delayed apatite formation, and hindered ionic release. Conversely, Mg ions facilitated greater interaction with the medium and rapid apatite formation, completely covering the fibers. The scaffolds showed no cytotoxicity in the MTT assay at concentrations of up to 200 µg/mL for HaCat cells and 0.8 mg/mL for L929 cells. This study demonstrated the effectiveness of using PVP in the production of black bioactive glass scaffolds, highlighting their potential for bone regeneration. Full article
(This article belongs to the Special Issue Materials for Drug Delivery and Medical Engineering)
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12 pages, 3147 KiB  
Article
Influence of Fast Drying on the Morphology of α-Fe2O3 and FeMnO3/α-Fe2O3 Fibers Produced by Solution Blow Spinning
by Lara Nágela Lopes Cavalcante Barros, Rondinele Nunes de Araujo, Emanuel Pereira do Nascimento, Alexandre José de Almeida Gama, Gelmires Araújo Neves, Marco Antonio Morales Torres and Romualdo Rodrigues Menezes
Nanomaterials 2024, 14(3), 304; https://doi.org/10.3390/nano14030304 - 2 Feb 2024
Cited by 1 | Viewed by 1377
Abstract
α-Fe2O3 and FeMnO3/α-Fe2O3 fibers were successfully prepared via Solution Blow Spinning (SBS). The effect of drying during the SBS process on fiber morphology was evaluated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and [...] Read more.
α-Fe2O3 and FeMnO3/α-Fe2O3 fibers were successfully prepared via Solution Blow Spinning (SBS). The effect of drying during the SBS process on fiber morphology was evaluated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2 adsorption–desorption isotherms. A slow drying promoted continuous fibers with rough surfaces and lower average diameters. However, fast drying enabled the production of fibers with low densification and many surface pores with higher BET-specific surface areas. The porous fibers produced have potential applications in energy generation and storage. Full article
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