海水鲈鱼鳞片及鳍骨中羟基磷灰石的X射线极图法和ODF法择优取向分析

发布时间：2018-06-04 02:17

本文选题：羟基磷灰石 + X射线极图　；参考：《工程科学学报》2017年11期

【摘要】：采用X射线衍射采集海水鲈鱼鳞片中羟基磷灰石(002)、(130)、(211)面网和鳍骨中羟基磷灰石(031)、(120)、(132)面网极图数据并计算了取向分布函数(ODF)以分析其择优取向特征,其中鳞片极图数据显示出羟基磷灰石结晶学c轴主要有3个择优取向,分别是与鳞片法线方向平行、相交39°和相交63°,而鳍骨极图推测出其羟基磷灰石c轴择优取向大致有五个方向,分别与鳍骨截面法线相交3°、9°、17°、24°和36°.ODF的计算结果表明,鳞片中羟基磷灰石有比较明显的择优取向是结晶学c轴近似平行于鳞片表面,同样,鳍骨ODF中羟基磷灰石择优取向为结晶学c轴近垂直于截面.极图和ODF结果上的差别是由于极图本身是晶体取向的二维投影图,单张极图显示的择优信息不够完整,因此ODF用来解析生物矿物的择优取向特征更为准确.鳞片和鳍骨中羟基磷灰石结构中的择优取向现象是因为生物矿化过程中有机质的调控作用而使结晶学c轴趋向平行胶原纤维长轴方向,并且这种择优特征也是硬体组织具有优良力学性能的要求.
[Abstract]:X ray diffraction (XRD) was used to collect the hydroxy apatite (HAP) in sea bass scales and hydroxyapatite (HAP) in fin bone. The orientation distribution function (ODF) was calculated to analyze its preferred orientation characteristics. The scale polar map data showed that there were three preferred orientations in the c-axis of hydroxyapatite crystallography, which were parallel to the normal direction of the scales. The preferred orientation of the hydroxyapatite c-axis is estimated to be approximately five directions by the finbone pole map. The calculated results show that the orientation of the hydroxyapatite c-axis intersecting with the normal line of the fin cross-section is 3 掳, 9 掳, 17 掳, 24 掳, and 36 掳. ODF, respectively. The preferred orientation of hydroxyapatite in the scale is that the c-axis of crystallography is approximately parallel to the surface of the scale. Similarly, the preferred orientation of hydroxyapatite in the fin ODF is that the c-axis of crystallography is nearly perpendicular to the section. The difference between the polar map and the ODF result is that the polar map itself is a two-dimensional projection of the crystal orientation, and the preferential information shown by the unipolar map is incomplete, so it is more accurate to use ODF to analyze the preferred orientation characteristics of biological minerals. The preferred orientation of hydroxyapatite structure in scales and fins is due to the regulation of organic matter in biomineralization, which makes the c axis of crystallization tend to parallel to the long axis of collagen fibers. And this preferred feature is also a requirement for the excellent mechanical properties of the hard tissue.
【作者单位】：北京大学地球与空间科学学院;教育部"造山带与地壳演化"重点实验室;
【基金】：国家自然科学基金资助项目(41372061,40972038)
【分类号】：O72;TB302

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