CRYSTALLIZATION OF CALCIUM PHOSPHATES - CONSTANT COMPOSITION STUDY
CRYSTALLIZATION OF CALCIUM PHOSPHATES - CONSTANT COMPOSITION STUDY
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DOI：
10.1021/ja00525a015
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发表时间：
1980-01-01
影响因子：
15
通讯作者：
NANCOLLAS, GH
中科院分区：
文献类型：
--
作者：
KOUTSOUKOS, P;AMJAD, Z;NANCOLLAS, GH
使用恒定溶液组成方法研究了在用高度结晶和良好表征的晶种材料进行晶种时从亚稳态过饱和溶液中磷酸钙相的结晶。通过同时添加含有钙、磷酸盐和氢氧根离子的试剂溶液（由特定离子电极控制），溶液中所有离子种类的活性保持恒定。在低磷酸钙浓度的溶液中，仅对于热力学最稳定的羟基磷灰石（HAP）而言过饱和，宏观量的该相可以在HAP晶种材料上生长，而不形成前体相。 pH 值为 7.40 时的低结晶速率的测量精度迄今为止无法达到。研究了过饱和度、晶种浓度和氟离子存在的影响。
The crystallization of the calcium phosphate phases from metastable supersaturated solutions upon seeding with highly crystalline and well-characterized seed material was studied using a constant solution composition method. Activities of all ionic species in solution were maintained constant by simultaneous addition of reagent solutions containing calcium, phosphate and hydroxyl ions, controlled by a specific ion electrode. In solutions of low calcium phosphate concentration, supersaturated only with respect to the thermodynamically most stable hydroxylapatite (HAP), macroscopic amounts of this phase could be grown on HAP seed material without the formation of a precursor phase. These low rates of crystallization at a pH of 7.40 were measured with a precision hitherto unattainable. The influence of supersaturation, seed concentration and presence of fluoride ion was investigated.