Influence of crystallite microstrain on surface complexes governing the metastable equilibrium solubility behavior of carbonated apatites.
Influence of crystallite microstrain on surface complexes governing the metastable equilibrium solubility behavior of carbonated apatites.
复制标题
微晶微应变对控制碳酸磷灰石亚稳态平衡溶解度行为的表面复合物的影响。
DOI：
10.1016/j.jcis.2007.07.084
复制
发表时间：
2008
影响因子：
9.9
通讯作者：
Higuchi,WilliamI
中科院分区：
文献类型：
--
作者：
Papangkorn,Kongnara;Yan,Guang;Heslop,DustinD;Moribe,Kunikazu;Baig,ArifA;Otsuka,Makoto;Higuchi,WilliamI
这项研究是关于矿物相微晶微应变 (CM) 对表面复合物 (SC) 性质的影响，表面复合物 (SC) 控制碳酸磷灰石 (CAP) 在含水酸性介质（0.10 M 醋酸盐缓冲液，含氟和不含氟化物，用 NaCl 维持 0.50 M 离子强度）中的亚稳态平衡溶解度 (MES) 行为。一组四种 CAP（通过沉淀法在 85°C 下合成）的 MES 行为被量化，这些 CM 增加，因此 MES 增加（CAP4 > CAP3 > CAP2 > CAP1）。结果如下。对于 CAP1 和 CAP2，对于非氟化物和氟化物情况，推导的 SC 分别为 Ca10(PO4)6(OH)2 和 Ca10(PO4)6F2。对于CAP3和CAP4，对于非氟化物和氟化物情况，推导的SC分别是Ca9.5(PO4)6OH或Ca9.5(HPO4)(PO4)5(OH)2和NaCa9.5(PO4)6F2。这些结果与早期有限研究的结果一起表明，随着 CAP CM 的增加，SC 的 Ca/P 比从 1.67 降低到 1.58 再到 1.50；这种关系与水沉淀的缺陷磷灰石的成熟化学成反比相关。此外，SC 似乎并不作为连续系列存在，只有少数 SC 可以解释各种 CAP 制剂中的 MES 行为。
This study was on the influence of the mineral phase crystallite microstrain (CM) on the nature of the surface complex (SC) governing the metastable equilibrium solubility (MES) behavior of carbonated apatites (CAPs) in aqueous acidic media (0.10 M acetate buffers, with and without fluoride, 0.50 M ionic strength maintained with NaCl). The MES behavior of a set of four CAPs (synthesized at 85 °C by a precipitation method) of increasing CM and therefore of increasing MES (CAP4 > CAP3 > CAP2 > CAP1) was quantified. The following were the findings. For CAP1 and CAP2, the SCs deduced were Ca10(PO4)6(OH)2and Ca10(PO4)6F2for the nonfluoride and the fluoride cases, respectively. For CAP3 and CAP4, the SCs deduced were Ca9.5(PO4)6OH or Ca9.5(HPO4)(PO4)5(OH)2and NaCa9.5(PO4)6F2for the nonfluoride and the fluoride cases, respectively. These results together with that from an earlier limited study show that the Ca/P ratio of the SC decreases from 1.67 to 1.58 to 1.50 with increasing CM of the CAPs; this relationship inversely correlates with the chemistry of maturation of aqueously precipitated defective apatites. Also the SCs do not appear to exist as a continuous series and only a few SCs may account for the MES behavior over a wide range of CAP preparations.