摘要
双壳纲贝壳是一种天然的有机—无机复合材料,具有优异的力学性能。为了解翡翠贻贝贝壳的矿物组成和微结构,利用X射线衍射仪(XRD)对贝壳进行分析,并利用扫描电镜(SEM)对其生长区和成熟区珍珠层微结构进行观察。结果表明,该贝壳珍珠层、棱柱层及其过渡区域均由文石组成;首次发现该贝壳珍珠层由帽状和平板状文石板片构成,其弯曲度和厚度呈动态变化,即从靠近棱柱层一侧到内表面一侧,板片弯曲度逐渐减小并从帽状过渡为平板状,板片在生长区和成熟区的平均厚度也分别从877 nm和1 184 nm减小到338 nm和390 nm。据此,建立了贝壳珍珠层新的结构模型,并认为这种独特的结构是棱柱层形貌、文石颗粒的随机沉积和有机质共同作用的结果。
Bivalve shell is a natural organic-inorganic composite material with excellent mechanical properties.The mineral composition and microstructure of Perna viridis shell were investigated by XRD analysis and microstructures of growing and mature regions of the nacre were observed by SEM.It was found that P.viridis shell is composed of aragonite and that the nacre consists of hat-shaped and flat aragonite sheets whose curvature and thickness change dynamically,i.e.the curvature decreases gradually from the region near prismatic layer to inner surface,and the hat-shaped aragonite sheets evolve gradually into flat sheets.Meanwhile,the thickness of the aragonite sheets in growing and mature regions decreases from 877 nm to 338 nm and from 1 184 nm to 390 nm,respectively.Finally,a new structural model of nacre was proposed and such unique structure was determined by the morphology of prismatic layer,random deposition of aragonite particles and organic matrix.
出处
《广西大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第6期882-886,共5页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(40772033)
关键词
翡翠贻贝
珍珠层
微结构
帽状文石板片
结构模型
Perna viridis
nacre
microstructure
hat-shaped aragonite sheet
structural model
