Fluorine in Shark Teeth: Its Direct Atomic-Resolution Imaging and Strengthening Function
Fluorine in Shark Teeth: Its Direct Atomic-Resolution Imaging and Strengthening Function
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DOI：
10.1002/anie.201307689
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发表时间：
2014-02-03
影响因子：
16.6
通讯作者：
Ikuhara, Yuichi
中科院分区：
文献类型：
--
作者：
Chen, Chunlin;Wang, Zhongchang;Ikuhara, Yuichi
束敏感生物矿物的原子分辨率成像是极具挑战性的，由于其相当复杂的结构和电子辐照造成的损伤。在这里，我们克服了这些困难，通过进行像差校正电子显微镜与低剂量成像技术，并报告成功的直接原子分辨率成像的每个单独的原子柱在复杂的氟磷灰石结构的鲨鱼牙齿釉质，这可能是至关重要的牙齿一般。我们证明，鲨鱼牙釉质中的每一个原子柱都可以空间分辨，并具有复杂的氟磷灰石结构。此外，从头计算表明，氟原子可以与周围的钙原子共价结合，这提高了对鲨鱼牙齿中氟原子防龋作用的理解。
Atomic-resolution imaging of beam-sensitive biominerals is extremely challenging, owing to their fairly complex structures and the damage caused by electron irradiation. Herein, we overcome these difficulties by performing aberration-corrected electron microscopy with low-dose imaging techniques, and report the successful direct atomic-resolution imaging of every individual atomic column in the complex fluorapatite structure of shark tooth enameloid, which can be of paramount importance for teeth in general. We demonstrate that every individual atomic column in shark tooth enameloid can be spatially resolved, and has a complex fluorapatite structure. Furthermore, abinitio calculations show that fluorine atoms can be covalently bound to the surrounding calcium atoms, which improves understanding of their caries-reducing effects in shark teeth.