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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Phase Evolution during the Formation of Stoichiometric Hydroxyapatite at 37.4 deg C
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Phase Evolution during the Formation of Stoichiometric Hydroxyapatite at 37.4 deg C

机译：37.4℃化学计量羟基磷灰石形成过程中的相演化

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摘要

The mechanism of formation of stoichiometric hydroxyapatite in aqueous solution by the acid-base reaction of the precursor calcium phosphates tetracalcium phosphate [Ca_4(PO_4)_2O, TetCP] and anhydrous dicalcium phosphate (CaHPO_4, DCPA) was investigated. Phase evolution during the formation of hydroxyapatite was studied, and could be correlated with the kinetics of reaction. Initial dissolution of precursors is followed by hydroxyapatite nucleation and growth. Consumption of DCPA precedes that of TetCP and results in the formation of nonstoichiometric hydroxyapatite. As a result of continued TetCP dissolution, the pH of the solution increases towards a pH at which hydroxyapatite and Ca(OH)_2 co-exist in equilibrium. Hydroxyapatite formation takes place in two stages: initially formed, nonstoichiometric hydroxyapatite subsequently reacts with TetCP and is converted to stoichiometric hydroxyapatite.
机译：研究了前体磷酸钙四磷酸钙[Ca_4（PO_4）_2O，TetCP]和无水磷酸二钙（CaHPO_4，DCPA）的酸碱反应在水溶液中形成化学计量羟基磷灰石的机理。研究了羟基磷灰石形成过程中的相演化，并可能与反应动力学相关。前体的最初溶解是羟基磷灰石成核和生长。 DCPA的消耗先于TetCP的消耗，并导致形成非化学计量的羟基磷灰石。 TetCP持续溶解的结果是，溶液的pH值朝着平衡状态下羟基磷灰石和Ca（OH）_2共存的pH值增加。羟基磷灰石的形成分两个阶段进行：首先形成，非化学计量的羟基磷灰石随后与TetCP反应并转化为化学计量的羟基磷灰石。

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