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Detailed Program
Paper Number : BI-O10
Time Frame : 16:13~16:25
Presentation Date : Thurse day, 27, November
Session Name : Biomaterials
Session Chair 1# : H. S. Yoon
Session Chair 2# : K. Uetsuki
Morphology of hydroxyapatite prepared from single crystals of calcium compounds
Ill Yong KIM
Nagoya University
Morphological control on hydroxyapatite (HAp, Ca10(PO4)6(OH)2) crystals is one of very important prospects on development of bioactive ceramic materials. Hydrothermal processing has been the subject of much attention for preparation of HAp because it allows formation of HAp crystals with various morphology. HAp morphology formed through the hydrothermal processing depends on the solubility of starting materials because the growth of HAp crystals was decided by dissolution of starting materials [1-3]. In the previous report, the possibility of orientation of HAp crystals was shown [2]. The orientation of HAp crystals could be formed the homogeneous dissolution from single crystal of calcite. The purpose of the present study is to investigate feasibility of well-crystallized HAp crystals with controlled morphology from single crystals of various calcium compounds through a hydrothermal processing. Single crystals of calcium compounds such as calcite (CaCO3), fluorite (CaF2), calcium tartrate tetrahydrate (Ca(C4H4O6)•4H2O) were examined in this study. The single crystals were applied to hydrothermal treatment in a phosphate solution for 24 h. Rod-shaped HAp formed on the surface of calcite. Oriented structure of rod-shaped HAp was constructed after hydrothermal treatment of {104} planes on calcite single crystal. Plate-shaped HAp formed on the fluorite while aggregation of nano-sized HAp on the calcium tartrate tetrahydrate was observed after hydrothermal processing. The HAp crystals formed on the single crystals was not morphologically changed with increasing the treatment periods. The difference in the solubility of the starting materials well affected the morphology of HAp formed on their surfaces under the hydrothermal condition, and thus the specific dissolution rate of calcium compound allowed orientation of the rod-shaped HAp crystals.

References:

[1] T. Goto, I. Y. Kim, K. Kikuta and C. Ohtsuki, J. Ceram. Soc. Japan, 120 (2012)131.
[2] I. Y. Kim, K. Kikuta and C. Ohtsuki, Kor, J. Mater. Res. 22 (2012) 397.
[3] I. Y. Kim, K. Kikuta and C. Ohtsuki, Ceram. Int. 40 (2014) 14385.
Acknowledgements : Acknowledgement: This work was supported by Grant-in-Aid for Scientific Research on the Innovative Areas: “Fusion Materials (no. 2206)” from the Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT).