In vitro surface reaction in SBF of a non-crystalline aluminosilicate (geopolymer) material
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Geopolymer is a non-crystalline material based on aluminosilicate reaction exhibiting ceramic-like properties. It showed the possibility to use geopolymer as biomaterials by soaking in SBF solution to induct carbonate apatite onto the surface of samples. Carbonate apatite possesses good biocompatibility and bioactivity. The aims of this research were to study the geopolymer synthesis as a biomaterial to replace bones and the effects of Ca/P ratio on bioactivity properties of metakaolin-based geopolymers. For in vitro bioactivity test, the samples were soaked in SBF to study the influence of Ca(OH)2 contents on the surface reaction. The 14, 28, and 90 day-soaked sample surfaces were investigated using SEM, XRD, and FTIR characterization. The compressive strength of samples was also tested. The SEM micrographs revealed that the increase of Ca/P ratio resulted in the increase of the carbonate apatite on sample surfaces. FTIR results confirmed that the formation of Ca10(PO4)3(CO3)3(OH)2 was investigated.
KeywordsMetakaolin-based geopolymer Calcium addition SBF soaking Carbonate apatite Bioactivities
This study received funding from the Thailand Graduate Institute of Science and Technology (TGIST), NSTDA, Thailand (TG-33-11-56-006D) and the Kasetsart University Research and Development Institute (KURDI), Bangkok, Thailand. Support from the Department of Materials Engineering, Faculty of Engineering and the Graduate School, Kasetsart University is also gratefully acknowledged.
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