Abstract
An investigation of the crystallization kinetics of 45S5 Bioglass® using differential scanning calorimetry is presented in this paper. Thermal analysis was performed using the Friedman method. The activation energy and the Avrami index were calculated. The glass samples were subjected to additional controlled heat treatment at 620 °C in order to obtain bioactive glass-ceramics with enhanced mechanical properties. X-ray powder diffraction (XRD) measurements indicated the formation of the glass-ceramic structures of three cyclosilicates: Na4Ca4(Si6O18) or Na6Ca3(Si6O18) or Na16Ca4(Si12O36). Based on middle infrared region (MIR) results, it can be concluded that the crystalline phase present in the tested materials was Na6Ca3(Si6O18) (combeite). Material was doped with Eu3+ ions, which act as a spectroscopic probe for monitoring the structural changes in the glass matrix. The decreasing value of the fluorescence intensity radio parameter indicated symmetry around the europium ions and, thus, the arrangement of the glass structure. The bioactive properties of the examined glass-ceramics were also determined. The bioactive glass fibers doped with Eu3+ were manufactured using two different methods. Its structural and luminescent properties were examined.
Highlights
Since 1969, 45S5 Bioglass® has been the first and the best know bioactive glass and it is widely used as a bone and tissue replacement because of its excellent biocompatibility [1,2,3]
The kinetics of the crystallization of the fabricated 45S5 glass were analyzed by the Friedman method and the Avrami index was calculated as 1.43 ± 0.09
A double peak in the histogram of the activation energy was found, and the activation of the crystallization energy was calculated as EA =
Summary
Since 1969, 45S5 Bioglass® has been the first and the best know bioactive glass and it is widely used as a bone and tissue replacement because of its excellent biocompatibility [1,2,3]. A bioactive glass, which means that this material is osteoconductive and osteoproductive and exhibits the highest rate of hydroxyapatite (HA) formation in vitro and in vivo that are necessary for tissue engineering applications [4,5,6]. Glass-ceramics are characterized by lower surface reactivity than typical glasses because of the decreasing of the Si-OH groups on their surfaces
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