abstract
The influence of two divalent cations, Cu2+ and Mn2+, on the structure, sintering, and crystallization of glasses and glass-ceramics in the diopside-calcium pyrophosphate system (90 wt.% diopside (CaMgSi2O6), 10 wt.% calcium pyrophosphate (Ca2P2O7)) was investigated. Glasses with 1, 3, and 5 wt% MnO or CuO additives were prepared by melt-quenching and characterized by XRD, Si-29 and P-31 NMR, DTA, and FTIR This revealed that the silicate network is predominantly coordinated in Q(2) (Si) units for all glasses, while phosphorus tends to inhabit an orthophosphate (Q(0)) environment. All glasses had a high rate of bioactivity after immersion in simulated body fluid. A slight depolymerization was observed in the doped glasses leading to lower T-g values in comparison with the parent glass. All glass-ceramics exhibited the formation of diopside as the primary crystalline phase after sintering at 850 degrees C/1 h. In comparison with the parent glass, the doped glasses featured significantly larger processing windows (T = T-c-T-g), ensuring good sinterability. Further, with increasing doping levels, the glasses exhibited a gradual decrease in T-p and T, suggesting an increased tendency toward devitrification. All Cu- and Mn-containing glasses exhibited the formation of hydroxyapatite, making them good candidates for biomedical applications and tissue engineering.
keywords
SIMULATED BODY-FLUID; LIME-SILICA GLASS; BIOACTIVE GLASSES; IN-VITRO; MAS-NMR; MANGANESE; COPPER; BIOCERAMICS; PHOSPHATE; BEHAVIOR
subject category
Materials Science
authors
Ben-Arfa, BAE; Salvado, IMM; Ferreira, JMF; Pullar, RC
our authors
Basam Abobaker Emhmed Ben-Arfa
Researcher
Isabel Margarida Miranda Salvado
Associate Professor
José Maria da Fonte Ferreira
Retired Professor
Rob Pullar
CollaboratorGroups
G4 - Renewable Materials and Circular Economy
G5 - Biomimetic, Biological and Living Materials
acknowledgements
R.C. Pullar wishes to thank the FCT Grant SFRH/BPD/97115/2013 for supporting this work. This work was developed in the scope of the project CICE-CO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable cofinanced by FEDER under the PT2020 Partnership Agreement.