淡水珍珠蚌壳中初生文石棱柱层的纳米至介观尺度结构及其矿化机制研究  

Nano-to mesoscale structures and the biomineralization mechanism of the initial aragonite prisms in the shell of freshwater pearl mussel

作　　者：高若何 王日泽 俸鑫 张刚生 GAO Ruo-he;WANG Ri-ze;FENG Xin;ZHANG Gang-sheng(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004

出　　处：《矿物学报》2021年第1期95-100,共6页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(编号:41762004)。

摘　　要：利用场发射扫描电镜(FESEM)、聚焦离子束(FIB)制样和透射电镜(TEM),研究了初生棱柱层的形貌和单个初生棱柱的内部结构及其结晶学性质。结果显示,棱柱直接由文石纳米颗粒定向附着生长而成;其次纳米颗粒的快速沉积造成不严格定向的生长,因而形成疏松多孔的棱柱表面;最后,棱柱由于竞争生长机制最终沿表壳层内表面的垂直方向生长。这些发现将增进我们对贝壳棱柱层生长过程的理解,也为研究珍珠层的生物矿化过程提供新的视角。The morphology of the initial prismatic layer,the internal structure and crystallographic properties of the individual initial prisms have been investigated in this paper by using the field emission scanning electron microscopy(FESEM),focused ion beam(FIB)for sample preparation,and transmission electron microscopy(TEM).Here,we have found that the prisms were directly formed by the growth of directionally attached aragonite nano-particles.Then,the rapid deposition of nanoparticles resulted in the non-strictly directional growth of aragonite prisms which are characterized with loose and porous surfaces.Finally,the prisms were grown along the vertical direction of inner surface of the periostracum of shell due to the competitive growth mechanism of prisms.These findings will enhance our understandings on the growth process of prismatic layer of shell,and will provide a new perspective for studying the biomineralization process of nacreous layer.

关 键 词：棱柱层 介观结构 文石纳米颗粒 定向附着 竞争生长 

分 类 号：P579[天文地球—矿物学] TB332[天文地球—地质学]