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11. Effect of the addition of Al2O3, TiO2 and ZnO on the thermal, structural and luminescence properties of Er3+-doped phosphate glasses

Author

Lopez-Iscoa, Pablo, Petit, Laeticia, Massera, Jonathan, Janner, Davide, Boetti, Nadia G., Pugliese, Diego, Fiorilli, Sonia, Novara, Chiara, Giorgis, Fabrizio, and Milanese, Daniel

Subjects
Condensed Matter - Materials Science
Abstract

Er-doped phosphate glasses were fabricated by melt-quenching technique. The changes in their thermal, structural and luminescence properties with the addition of Al2O3, TiO2 or ZnO were studied. Physical and thermal properties were investigated through density measurement and differential thermal analysis. Structural characterization was performed using the Raman and Infrared spectroscopy. In order to study the influence of the composition on the luminescence properties of the glasses, the refractive index, the luminescence spectra and the lifetime values were measured. The results show that with the addition of Al2O3 and TiO2 the phosphate network becomes more connected increasing the glass transition temperature, whereas the addition of ZnO does not show significant changes in the optical, thermal and structural properties but it leads to a larger emission cross-section at 1540 nm as compared to the other glasses. As the site of the Er3+ is not strongly affected by the change in the glass composition, we think that the emission properties of the glasses depend on the glass structure connectivity, which has an impact on the Er3+ ions solubility., Comment: 32 pages, 9 figures, 1 table

Published
2017
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19. Contributors

Author

Almaguer-Flores, Argelia, primary, Arango-Ospina, Marcela, additional, Augurio, Adriana, additional, Boccaccini, Aldo R., additional, Cazzola, Martina, additional, Drouet, Christophe, additional, Ferraris, Sara, additional, Gaspar, J., additional, Guarino, Vincenzo, additional, Huang, Jie, additional, Iafisco, Michele, additional, Massera, Jonathan, additional, Morra, Marco, additional, Narayan, Roger, additional, Nawaz, Qaisar, additional, Parisi, Ortensia Ilaria, additional, Pascale, Silvia, additional, Pires, L.R., additional, Puoci, Francesco, additional, Ravizza, Alice, additional, Rey, Christian, additional, Rodil, Sandra E., additional, Ruffo, Mariarosa, additional, Salama, Ahmed, additional, Serra, Tiziano, additional, Shukry, Nadia, additional, Silva-Bermúdez, Phaedra, additional, Spriano, Silvia, additional, Sutthavas, Pichaporn, additional, de Oliveira, Paulo Tambasco, additional, Tognato, Riccardo, additional, van Rijt, Sabine, additional, Warchomicka, Fernando, additional, Yamaguchi, Seiji, additional, Zengin, Aygul, additional, Zhang, Bin, additional, and Zuardi, Leonardo Raphael, additional

Published
2020
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23. Characterization of biodegradable core–clad borosilicate glass fibers with round and rectangular cross‐section

Author

Hongisto, Mikko, primary, Ghanavati, Sonya, additional, Lemiere, Arnaud, additional, Hauss, Gregory, additional, Boraiah, Shashank, additional, Cornet, Louis, additional, Poulon‐Quintin, Angeline, additional, Pagnoux, Dominique, additional, Bernard, Dominique, additional, Massera, Jonathan, additional, Petit, Laeticia, additional, Jubera, Veronique, additional, and Danto, Sylvain, additional

Published
2023
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24. Evaluation of the sterilization effect on biphasic scaffold based on bioactive glass and polymer honeycomb membrane.

Author

Coquen, Audrey Deraine, Bondzior, Bartosz, Petit, Laeticia, Kellomäki, Minna, Pauthe, Emmanuel, Boissière, Michel, and Massera, Jonathan

Subjects
BIOACTIVE glasses, BIOPOLYMERS, RADIATION sterilization, APATITE, PHOTOLUMINESCENCE measurement, BONE regeneration, SHEARING force, POLYMERIC membranes
Abstract

The sterilization is a core preoccupation when it comes to implantable biomaterials. The most common in industry is the gamma sterilization; however, the radiation used in this method can induce modifications in the material properties. This study investigates the impact of such radiations on the physicochemical properties and biological toxicity of a new biomaterial based on a poly‐l‐co‐d,l‐lactide polymer honeycomb membrane and bioactive glass (BG), combined, to form an assembly (membrane/BG assembly). The investigated BGs are the S53P4, which is FDA approved and clinically used, and 13‐93B20, a BG containing boron promising for bone regeneration. Infrared and photoluminescence measurements revealed that, upon irradiation, defects are created in the BGs molecular matrix. Defects were identified to be mainly non‐bridging oxygen hole center and occur in higher proportion in the 13‐93B20 making it more sensitive to irradiation compared to the S53P4. However, the irradiation does not significantly impact the structure of the BGs. On the membrane side, the molecular weight is divided by two resulting in a lower shear stress resistance. However, the membrane honeycomb topography does not seem to be impacted by the irradiation. In contact with cells, no toxicity effect was observed, and BGs keep their bioactive properties by releasing ions beneficial to the cell fate and with no influence on apatite precipitation speed. Overall, this study showed that, despite some impact on the physicochemical properties, the irradiation does not induce deleterious effect on the membrane/BG assemblies and is therefore a suitable method for the sterilization of this novel biomaterial. [ABSTRACT FROM AUTHOR]

Published
2024
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43. Surface Properties and Antioxidant Activity of Silicate and Borosilicate Bioactive Glasses.

Author

Ferraris, Sara, Corazzari, Ingrid, Turci, Francesco, Cochis, Andrea, Rimondini, Lia, Spriano, Silvia, Massera, Jonathan, and Vernè, Enrica

Subjects
BIOACTIVE glasses, BOROSILICATES, SURFACE properties, ZETA potential, FRACTIONS, REACTIVE oxygen species, PROGENITOR cells, SILICATES
Abstract

Herein, silicate and borosilicate bioactive glasses are synthetized and characterized. The antioxidant activity, in the presence and absence of human osteoblasts' progenitor cells, of the different glass compositions, is correlated to the surface properties: wettability, zeta potential, hydroxylation degree, reactivity in simulated body fluid (SBF), and Tris buffer. An enhancing effect of boron in glass reactivity and a stabilizing role of Sr and Mg are evidenced. The scavenging potential of the analyzed bioactive glasses toward reactive oxygen species (ROS) is clearly proved. Moreover, cellular tests confirm the protective effect of the bioactive glasses toward viable cells acting as ROS/RNS species scavenger. The obtained results represent an original improvement of the knowledge concerning the intrinsic antioxidant ability of bioactive glasses with different compositions and the mechanisms involved. [ABSTRACT FROM AUTHOR]

Published
2023
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44. Mechanical Properties of Robocast Glass Scaffolds Assessed through Micro-CT-Based Finite Element Models.

Author

D'Andrea, Luca, Gastaldi, Dario, Verné, Enrica, Baino, Francesco, Massera, Jonathan, Örlygsson, Gissur, and Vena, Pasquale

Subjects
FINITE element method, ELASTICITY, FIBERS, COMPRESSION loads, CRACK propagation (Fracture mechanics), X-ray computed microtomography, POLYCAPROLACTONE
Abstract

In this study, the mechanical properties of two classes of robocast glass scaffolds are obtained through Computed micro-Tomography (micro-CT) based Finite Element Modeling (FEM) with the specific purpose to explicitly account for the geometrical defects introduced during manufacturing. Both classes demonstrate a fiber distribution along two perpendicular directions on parallel layers with a 90 ∘ tilting between two adjacent layers. The crack pattern identified upon compression loading is consistent with that found in experimental studies available in literature. The finite element models have demonstrated that the effect of imperfections on elastic and strength properties may be substantial, depending on the specific type of defect identified in the scaffolds. In particular, micro-porosity, fiber length interruption and fiber detaching were found as key factors. The micro-pores act as stress concentrators promoting fracture initiation and propagation, while fiber detachment reduces the scaffold properties substantially along the direction perpendicular to the fiber plane. [ABSTRACT FROM AUTHOR]

Published
2022
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