Surface structure and properties of fluoridated calcium hydroxyapatite
Surface structure and properties of fluoridated calcium hydroxyapatite
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DOI：
10.1016/s0927-7757(02)00005-5
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发表时间：
2002-05
期刊：
影响因子：
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通讯作者：
Hidekazu Tanaka;A. Yasukawa;K. Kandori;T. Ishikawa
中科院分区：
文献类型：
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作者：
Hidekazu Tanaka;A. Yasukawa;K. Kandori;T. Ishikawa
通过各种技术研究了在中性pH下用不同浓度的F−离子处理的合成羟基磷灰石（CaHap）的表面结构和性能。在低于0.03 mol dm− 3时，F−离子在CaHap上的吸附等温线表现为朗缪尔型，饱和量估计为1.7个离子nm−2。该值低于根据CaHap晶体结构计算的表面OH−数的2.88离子nm− 2，证明所有表面OH−离子没有被F−离子取代。CaHap柱OH−离子的氘化受到干扰，因为OH−柱入口处沿沿着c轴（即a B面）的OH−离子被F−离子取代。当样品被处理到高于0.04 mol dm−3时，CaHap的表面相溶解以产生氟磷灰石钙，因此，CaHap的柱OH−离子的氘化比被处理到低于0.03 mol dm−3的材料更被促进。CaHap的表面H2PO4−和HPO42−离子没有被F−离子取代。
The surface structure and properties of synthetic calcium hydroxyapatite (CaHap) treated with different concentrations of F−ions at neutral pH were investigated by a variety of techniques. The adsorption isotherm of F−ions on CaHap below 0.03 mol dm−3exhibited the Langmuir type and the saturated amount was estimated to be 1.7 ions nm−2. This value is lower than 2.88 ions nm−2of surface OH−number calculated from the crystal structure of CaHap, proving that all the surface OH−ions are not replaced with F−ions. The deuteration of column OH−ions of CaHap was interfered with F−ions replaced for OH−ions in the entrance of OH−columns along c-axis, that is, on a b face. When the samples were treated above 0.04 mol dm−3, the surface phase of CaHap was dissolved to produce calcium fluorapatite, so that, the deuteration of column OH−ions of CaHap was more promoted than the materials treated below 0.03 mol dm−3. The surface H2PO4−and HPO42−ions of CaHap were not replaced with F−ions.