Effect of aging condition on the synthesis of 54s4p bioactive glass through sol-gel rout
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Date
2019-05
Authors
Deborah Odette Moizin
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Abstract
The golden standard 45S5 BG has been intensively studied by many
researchers. However, a recent novel composition of bioactive glass which is 54S4P
(54 wt.% SiO2, 22 wt.% CaCO3, 20 wt.% Na2O, 4 wt.% P2O5) was successfully
fabricated through melt-derive method. Melt-derived 54S4P BG had lower melting
temperature compared to 45S5 BG and its properties had shown to be comparable with
45S5 BG. 54S4P BG was fabricated through sol-gel method and the effect of aging
on the structural, bioactivity, and morphology of 54S4P BG was studied by varying
the aging condition. The aging time was varied for 3 days, 7 days, 10 days and 14 days
at room temperature. Whereas, the aging temperature was varied for 3 days at room
temperature, 40 ˚C and 60 ˚C. The DSC-TGA result confirmed the stabilization
temperature of 54S4P bioactive glass at 700 ˚C. XRD showed combeite high
(Ca4Na4O18Si6) was the major crystalline phase. Results obtained from XRD and FTIR
before the immersion in HBSS showed sharper and more definite peaks at decreasing
aging time due to lower water content. But increasing aging temperature showed
stronger and more intense peaks due to the formation of larger and coarser particles.
SEM only showed the existence of needle-like crystals belonging to Ca4Na4O18Si6 in
samples aged at lower temperature, room temperature. The existence of HA can be
confirmed though FTIR, FESEM-EDX and pH evolution after immersion of 54S4P
BG in HBSS. Hence, 54S4P has great potential to be used in the medical field.