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首页> 外文期刊>Crystal growth & design >The calcium phosphate - Calcium carbonate system: Growth of octacalcium phosphate on calcium carbonates
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The calcium phosphate - Calcium carbonate system: Growth of octacalcium phosphate on calcium carbonates

机译：磷酸钙-碳酸钙系统：碳酸钙在磷酸钙上的生长

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摘要

The kinetics of nucleation and crystal growth of octacalcium phosphate [Ca_8(PO_4)_6H_2·5H_2O, OCP] from calcium phosphate supersaturated solutions inoculated with seed crystals was investigated at 37 °C, pH 7.40, at conditions of constant solution supersaturation. Stable calcium phosphate solutions, supersaturated with respect to OCP and hydroxyapatite [Ca_5(PO_4) _3OH, HAP] were inoculated with calcium carbonate-based bone cement powder consisting of mixed aragonite and calcite crystals and with well-characterized calcite seed crystals. On all substrates tested, OCP nucleated followed by crystal growth of the nuclei formed past the lapse of induction times, inversely proportional to the solution supersaturation. From the dependence of the induction time on the solution supersaturation with respect to OCP, a value of 10 m~(-2) m was calculated for the nucleating phase. The rates of OCP crystal growth on the carbonate substrates showed linear dependence on the solution supersaturation that in combination with the independence from the fluid dynamics in the reactor suggested a surface diffusion-controlled mechanism. Moreover, the independence of the crystallization rates on the amount of the inoculating seed crystals suggested that nucleation and growth took place exclusively on the crystalline substrates. The transient calcium phosphate phase, OCP, was stabilized in our experiments, and it was the only phase growing at constant driving force, despite the fact the solutions were supersaturated with respect to HAP as well.
机译：在恒定溶液过饱和条件下，在37°C，pH 7.40下，研究了接种晶种的磷酸钙过饱和溶液中磷酸八钙[Ca_8（PO_4）_6H_2·5H_2O，OCP]的成核动力学和晶体生长。将相对于OCP和羟基磷灰石[Ca_5（PO_4）_3OH，HAP]过饱和的稳定磷酸钙溶液接种碳酸钙基​​骨水泥粉末，该粉末由混合的文石和方解石晶体组成，并具有特征明确的方解石晶种。在所有测试的底物上，OCP成核，随后在诱导时间过去之后形成的核晶体生长，与溶液过饱和度成反比。根据诱导时间对溶液过饱和度（相对于OCP）的依赖性，计算出成核相的值为10 m〜（-2）m。碳酸盐基质上OCP晶体的生长速率显示出对溶液过饱和度的线性依赖性，与反应器中流体动力学的独立性相结合，表明了表面扩散控制的机理。此外，结晶速率对接种种晶数量的独立性提示成核和生长仅发生在结晶基质上。在我们的实验中，瞬时磷酸钙相OCP稳定了，尽管溶液相对于HAP也过饱和，但它是唯一在恒定驱动力下生长的相。

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