Morphology and Phase Identification of Bioactive Freeze-Dried β-CaSiO₃

Abstract:

Freeze-dried β-wollastonite (β-CaSiO₃) powders were synthesized via sol-gel, combined with autoclaved, sintered and finally freeze-dried at -50 °C for 12 h using rice straw ash and calcined limestone as the starting materials. To prepare β-CaSiO₃, the precursor ratio of SiO₂:CaO was set at 45:55. Pure β-CaSiO₃ was obtained after sintering at 950 °C for 3 h. The bioactivity of freeze-dried β-CaSiO₃ was investigated by soaking the cylinderical shape samples in simulated body fluid (SBF) up to 21 days. The surface compositional, morphological and structural changes of the samples before and after soaking were analyzed via X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM) coupled with EDS. Sintered freeze-dried β-CaSiO₃ has a porous structure and changed to cauliflower-like after soaking in simulated body fluid solution. After 21 days of soaking process, an amorphous calcium phosphate (ACP) and calcium deficient hydroxyapatite (CDHA) were formed with the molar ratio of Ca/P between 1.76 to 1.63.

• Periodical: Key Engineering Materials (Volume 694)
• Pages: 72-77
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.694.72
• Online since: May 2016
• Authors: Hamisah Ismail, Shun Xiang Yau, Roslinda Shamsudin*, Muhammad Azmi Abdul Hamid, Rozidawati Awang
• Keywords: Bioactive, Freeze-Dried β-CaSiO₃, Morphology

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