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Proceedings Paper

Influence of solution concentration on controlled crystallization of calcium phosphate
Author(s): C. L. Ma; F. Qian; H. B. Lu
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Paper Abstract

To investigate the influence of solution concentration on controlled crystallization of calcium phosphate, controlled crystallization in the presence of stearic acid monolayer from solutions of hydroxyapatite with different [Ca2+] have been studied by SEM, TEM with ED, IR, XRD. When [Ca2+] is 0.4 mM, octacalcium phosphate (OCP) which is a thermodynamically undersaturated phase in this condition precipitates due to the 'concentration effect' of charged headgroup -COO- of stearic monolayer to Ca2+ in the solution; while solution is supersaturated in which [Ca2+] is 4 mM, the first precipitates phase is hydroxyapatite (HAP) with (0001) parallel to the surface of stearic monolayer. Subsequent growth results in oriented OCP crystals, and all the crystals show a white semi- globular characters; while [Ca2+] is up to 5 mM, the increasing of mineralization rate results to the rapid nucleation of HAP into some core-like structure and the later growth of platelet-like OCP as the 'shell.' Nucleation of DCPD between OCP showing a flower-like structure also found at LB film/solution interface. The mechanism of influence of concentration was discussed.

Paper Details

Date Published: 20 February 1998
PDF: 5 pages
Proc. SPIE 3175, Third International Conference on Thin Film Physics and Applications, (20 February 1998); doi: 10.1117/12.300706
Show Author Affiliations
C. L. Ma, Tsinghua Univ. (China)
F. Qian, Tsinghua Univ. (China)
H. B. Lu, Tsinghua Univ. (China)


Published in SPIE Proceedings Vol. 3175:
Third International Conference on Thin Film Physics and Applications
Shixun Zhou; Yongling Wang; Yi-Xin Chen; Shuzheng Mao, Editor(s)

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