Ribeiro Cristina Castro, Gibson Iain, Barbosa Mário Adolfo
INEB-Instituto de Engenharia Biomédica, Laboratório de Biomateriais, Rua do Campo Alegre 823, Porto 4150-180, Portugal.
Biomaterials. 2006 Mar;27(9):1749-61. doi: 10.1016/j.biomaterials.2005.09.043. Epub 2005 Oct 26.
In order to understand the effect of titanium ions on the molecular structure of hydroxyapatite (HAp), HAp powders were incubated in solutions with different titanium concentrations. After incubation, the powders obtained were analysed using different techniques, namely X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), differential thermal analysis (DTA), X-ray photoelectron spectroscopy (XPS), and energy dispersive spectroscopy (EDS). The results suggest that, depending on the concentration of titanium in solution, two different mechanisms of interaction with HAp occur. For concentrations equal to or smaller than 200 ppm, the titanium uptake by the solid seems to be primarily due to incorporation in the lattice. For higher concentrations, a dissolution-precipitation process seems to occur, leading to formation of a titanium phosphate compound.
为了了解钛离子对羟基磷灰石（HAp）分子结构的影响，将HAp粉末置于不同钛浓度的溶液中进行孵育。孵育后，使用不同技术对所得粉末进行分析，即X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、差热分析（DTA）、X射线光电子能谱（XPS）和能量色散光谱（EDS）。结果表明，根据溶液中钛的浓度，会出现两种与HAp相互作用的不同机制。对于浓度等于或小于200 ppm的情况，固体对钛的吸收似乎主要是由于其掺入晶格中。对于更高的浓度，似乎会发生溶解-沉淀过程，导致形成磷酸钛化合物。
