淡水三角帆蚌贝壳珍珠质的同步辐射XRD研究

doi:10.3724/SP.J.1077.2012.00524

无机材料学报 ›› 2012, Vol. 27 ›› Issue (5): 524-528.DOI: 10.3724/SP.J.1077.2012.00524 CSTR: 32189.14.SP.J.1077.2012.00524

淡水三角帆蚌贝壳珍珠质的同步辐射XRD研究

鄢晓晖, 王胜男, 杜博, 王小祥

(浙江大学材料科学与工程系, 杭州310027)

收稿日期:2011-07-08 修回日期:2011-09-14 出版日期:2012-05-10 网络出版日期:2012-03-31
作者简介:鄢晓晖(1986-), 男, 硕士研究生. E-mail: 20926060@zju.edu.cn
基金资助:
国家自然科学基金(50571088) National Natural Science Foundation of China (50571088)

Synchrotron XRD Study on the Nacre of Freshwater Bivalve H. cumingii Lea

YAN Xiao-Hui, WANG Sheng-Nan, DU Bo, WANG Xiao-Xiang

(Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)

Received:2011-07-08 Revised:2011-09-14 Published:2012-05-10 Online:2012-03-31
About author:YAN Xiao-Hui. E-mail: 20926060@zju.edu.cn

摘要/Abstract

摘要：

利用同步辐射XRD研究淡水三角帆蚌贝壳珍珠质的内应力和珍珠质中单个文石板片的微结构, 发现淡水三角帆蚌贝壳珍珠质中单个文石板片内存在晶内有机物, 且该晶内有机物导致珍珠质层中产生拉应力. 这一拉应力沿不同晶向呈现强烈的各向异性, 表明晶内有机物在文石板片内很可能以某一特定的方式排列. 同步辐射XRD图谱的线形分析进一步证实淡水三角帆蚌贝壳珍珠质中的晶内有机物吸附于文石板片的(002)晶面. 这些研究结果将促进珍珠质矿化及强韧化机制的研究, 为设计高性能无机-有机复合材料及培育珍珠提供科学的根据.

关键词: 珍珠质, 同步辐射XRD, 微结构, 内应力

Abstract:

Synchrotron XRD was used to study internal stress of nacre and microstructure of individual nacre tablet in the shell of freshwater bivalve H. cumingii Lea. The diffraction patterns show some biopolymers (intra-crystalline organic matrix) are occluded inside nacre tablets during biomineralization, causing that nacre powder exhibits tensile- like internal stress which is strongly anisotropic along different vectors of the reciprocal lattice. The characteristic of internal stress suggests that the intra-crystalline organic matrix is most probably arranged in the specific form. And line profile analysis which is conducted with the synchrotron XRD patterns of heated and unheated nacre powder samples, further confirms that the intra-crystalline organic matrix is adsorbed on (002) atomic planes of nacre tablets. The findings will facilitate the study on the formation mechanism and the strengthening and toughening mechanism of the nacre and provide theoretical basis for designing new organic-inorganic composite with high performances and cultivating pearl.

Key words: nacre, synchrotron XRD, microstructure, internal stress

中图分类号:

TB332

鄢晓晖, 王胜男, 杜博, 王小祥. 淡水三角帆蚌贝壳珍珠质的同步辐射XRD研究[J]. 无机材料学报, 2012, 27(5): 524-528.

YAN Xiao-Hui, WANG Sheng-Nan, DU Bo, WANG Xiao-Xiang. Synchrotron XRD Study on the Nacre of Freshwater Bivalve H. cumingii Lea[J]. Journal of Inorganic Materials, 2012, 27(5): 524-528.

图/表 5

图1 经200℃保温0、0.5、12和60 h的淡水三角帆蚌贝壳珍珠质粉体试样同步辐射XRD图谱

Fig. 1 Selected synchrotron diffraction peaks taken from H. cumingii powder samples annealed at 200℃ for 0, 0.5, 12 and 60 h (a) (002) reflection; (b) (012) reflection; (c) (111) reflection: (d) (021) reflection

图2 未经历制粉过程的块体珍珠质(002)衍射峰位与未经任何处理的珍珠质粉体(002)衍射峰位的相互比较

Fig. 2 Comparison between nacre block and nacre powder sample in angular positions of their synchrotron (002) diffraction profile

图3 次氯酸钠溶液浸泡两周后的珍珠质粉体和未处理珍珠质粉体的(002)同步辐射衍射峰

Fig. 3 Comparison between nacre powder unbleached and bleached for two weeks in angular positions of their synchrotron (002) diffraction profile

图4 利用Vogit函数拟合(002)、(012)、(111)、(021)、(112) 和(031)衍射峰峰形求得沿各相应晶向的

Fig. 4 (a) Crystalline sizes and (b) averaged microstrain fluctuations along different crystallographic directions for H. cumingii plotted as functions of annealing time

参考文献 17

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淡水三角帆蚌贝壳珍珠质的同步辐射XRD研究

Synchrotron XRD Study on the Nacre of Freshwater Bivalve H. cumingii Lea

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