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首页> 外文期刊>Advanced Functional Materials >Variations in Atomic Disorder in Biogenic Carbonate Hydroxyapatite Using the Infrared Spectrum Grinding Curve Method
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Variations in Atomic Disorder in Biogenic Carbonate Hydroxyapatite Using the Infrared Spectrum Grinding Curve Method

机译：红外光谱磨削曲线法分析生物碳酸盐羟基磷灰石的原子序变化

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摘要

Biogenic carbonate hydroxyapatite crystals are inherently disordered at the atomic level due mainly to the substitutions of various ions in the crystal structure, and, in the case of the bone family of materials, to the fact that these very small crystals have a very large surface-to-bulk ratio. Characterization of the extent of disorder is of much interest, as this relates to the stability and hence solubility of the crystals. Here the infrared spectrometry grinding curve approach developed for calcite, is adapted to carbonate hydroxya-patites. The infrared splitting factor is plotted against the full width at half height of the strong phosphate absorption peak as a function of increased grinding of the sample. By doing so, the contribution of particle size to the shape of the peaks is better separated from the contribution of atomic disorder to peak shape. It is shown that differences in disorder exist between dentine, cementum, and bone crystals which could reflect crystal size and/or atomic defects within the crystal. It is als shown that systematic differences exist between enamel samples from different taxa, which we assume only reflects atomic disorder differences within these large crystals. The method can be used to characterize atomic disorder in natural hydroxyapatites, as well as in the many different types of synthetic hydroxyapatites used for biomedical implants.
机译：生物碳酸盐羟基磷灰石晶体在原子水平上固有地无序，这主要是由于晶体结构中各种离子的取代所致；对于骨族材料而言，这些非常小的晶体具有非常大的表面-批量比。无序程度的表征是非常令人感兴趣的，因为这关系到晶体的稳定性以及因此的溶解度。在这里，针对方解石开发的红外光谱研磨曲线方法适用于碳酸盐羟基磷灰石。相对于强磷酸盐吸收峰半高处的全宽绘制红外分光系数，作为样品研磨增加的函数。通过这样做，更好地将粒径对峰形状的贡献与原子无序对峰形状的贡献分开。结果表明，牙本质，牙骨质和骨晶体之间存在无序差异，这可能反映晶体的大小和/或晶体中的原子缺陷。研究还表明，来自不同分类单元的搪瓷样品之间存在系统差异，我们认为这仅反映了这些大晶体中的原子无序差异。该方法可用于表征天然羟基磷灰石以及用于生物医学植入物的许多不同类型的合成羟基磷灰石中的原子无序。

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  • 来源
    《Advanced Functional Materials》 |2011年第17期|p.3308-3313|共6页
  • 作者

    Yotam Asscher; Steve Weiner; Elisabetta Boaretto;

  • 作者单位

    Department of Structural Biology and the Kimmel Center for Archaeological Science Weizmann Institute of Science Rehovot 76100, Israel;

    Department of Structural Biology and the Kimmel Center for Archaeological Science Weizmann Institute of Science Rehovot 76100, Israel;

    Radiocarbon and Cosmogenic Isotopes Laboratory Kimmel Center for Archaeological Science Weizmann Institute of Science 76100 Rehovot, Israel,Department of Land of Israel Studies and Archaeology Bar-llan University Ramat-Can 52900, Israel;

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