仿生矿化的研究Ⅰ．文石型碳酸钙的合成

Study of the BiomimicingⅠ.The Synthesis of Aragonite Calcium Carbonate

在聚乙二醇（ＰＥＯ）存在下，ＣａＣｌ２和Ｎａ２ＣＯ３反应生成了类似红鲍鱼壳的含有ＰＥＯ的碳酸钙──高聚物复合材料。Ｘ－衍射和电镜照片显示，它有两种微观结构：外层为文石型和方解石型结构，内层为针状文石型结构。热重分析表明，该材料中含有３％左右ＰＥＯ。结果说明，聚合物对碳酸钙晶核的形成和晶体的生长有很大影响，并对其形成机理进行了初步探讨。

The composite material of CaCO_3-PEO like red abalone shell was prepared by mixing aqueous solution of Na_2CO_3 and CaCl_2 in the presence of PEO.XRD and SEM show that CaCO_3 displays two types of microstructure:the outer side is aragonite and calcite,and the inner side is needle-like aragonite.The result demonstrates that polymers have an influence on the nucleation and crystal growth.The formation mechanism is discussed.