The Crystallization of Fluoroapatite Dumbbells from Supersaturated Aqueous Solution
The Crystallization of Fluoroapatite Dumbbells from Supersaturated Aqueous Solution
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DOI：
10.1021/cg050428f
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发表时间：
2006-02
影响因子：
3.8
通讯作者：
O. Prymak;V. Sokolova;T. Peitsch;M. Epple
中科院分区：
文献类型：
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作者：
O. Prymak;V. Sokolova;T. Peitsch;M. Epple
氟磷灰石的结晶非常重要，因为许多生物系统在牙齿（鲨鱼）中使用这种矿物质或用于保护（软体动物）。氟磷灰石的结晶在钛金属、聚合物（聚（乙烯-共-1,4-环己烷-对苯二甲酸二甲酯），PETG）上以及在由聚四氟乙烯（PTFE）制成的管式反应器中进行。观察到导致独特哑铃状形态的特殊形态发生。形态明显取决于外部参数 pH 值和过饱和度。次要参数是结晶时间、离子强度以及钙、磷酸盐和氟化物的化学计量比。哑铃仅在 pH 值 5−7 范围内观察到。提出了分别基于分支六角棱柱和分支尖峰在 pH 5−6 和 pH 6−7 下氟磷灰石的两种不同生长机制。带电添加剂（阳离子和阴离子表面活性剂、聚天冬氨酸、聚赖氨酸）的存在...
The crystallization of fluoroapatite is of importance because a number of biological systems makes use of this mineral in teeth (sharks) or for protection (molluscs). The crystallization of fluoroapatite was performed on titanium metal, on polymer (poly(ethylene-co-1,4-cyclohexane-dimethylene-terephthalate), PETG), and in a tubular reactor made of polytetrafluoroethylene (PTFE). A special morphogenesis leading to a distinct dumbbell-like morphology was observed. The morphology was clearly dependent on the external parameters pH and supersaturation. Secondary parameters were the crystallization time, the ionic strength, and the stoichiometric ratios of calcium, phosphate, and fluoride. Dumbbells were only observed in the pH range of 5−7. Two different growth mechanisms for fluoroapatite at a pH of 5−6 and a pH of 6−7 are proposed, based on branching hexagonal prisms and on branching spikes, respectively. The presence of charged additives (cationic and anionic surfactants, poly(aspartic acid), polylysine) l...