Abstract:

Natural fresh scallop and nacre were used in the present work.Chemical composition,structure characteristics and thermal analysis were investigated in details.Scallop and nacre were both consisted of ~95% CaCO₃ and ~5% organic matrix.The inorganic phase of scallops was almost 100% calcite,and the inorganic phase of mother of pearl shells was consisting of 4.96% calcite and 95.04% aragonite.And organic matrix separated from scallop and nacre was different.The result of thermal analysis indicated that thermal analysis included degeneration and decomposition of organic matter and decomposition of calcium carbonate two stages.The difference is that polymorph conversion from aragonite into calcite in nacre at 400-500℃.It provides basic data for the biomineralization.

Key words: scallop, nacre, chemical composition, structure characteristics, thermal analysis

摘要：

以扇贝和珍珠母贝壳为研究对象,对其化学成分、微观结构以及热分解行为进行研究,结果表明,扇贝和珍珠母贝壳都是由95%左右的CaCO₃和5%左右的有机质组成。其中,扇贝的无机相几乎由100%的方解石组成,而珍珠母贝壳的无机相由4.96%的方解石和95.04%的文石组成。且两者所含有机质的成分存在很大的差异。热分析表明,热分解分为两个阶段,第一阶段为有机质的变性和分解,第二阶段为碳酸钙分解为二氧化碳和氧化钙的过程。有所不同的是,珍珠母贝壳在400~500℃出现了由文石转变为方解石的晶型转换,可为生物矿化等提供参考。

关键词: 扇贝, 珍珠母贝壳, 化学成分, 结构特征, 热分析