Nanoporous Structure and Medium-Range Order in Synthetic Amorphous Calcium Carbonate
Nanoporous Structure and Medium-Range Order in Synthetic Amorphous Calcium Carbonate
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DOI：
10.1021/cm100294d
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发表时间：
2010-05-25
影响因子：
8.6
通讯作者：
Reeder, Richard J.
中科院分区：
文献类型：
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作者：
Goodwin, Andrew L.;Michel, F. Marc;Reeder, Richard J.
我们采用反向蒙特卡罗细化方法，使用实验X射线全散射数据，开发一个合成的，水合无定形碳酸钙（ACC）的结构模型。ACC被发现是由一个多孔的富钙框架，支持含有水和碳酸盐分子的相互连接的通道。先前未被识别的纳米级通道网络的存在表明了添加剂如何被容纳在结构内并提供临时稳定以及影响结晶过程的机制。此外，虽然缺乏长程有序，但ACC中的富钙框架包含与方解石、文石和球文石中存在的钙堆积密度相似的钙堆积密度，从而提供了无定形材料如何转化为不同结晶形式的线索。我们的研究结果为推进我们对生物矿化的理解以及开发下一代材料合成的仿生方法提供了一个新的起点。
We adopt a reverse Monte Carlo refinement approach, using experimental X-ray total scattering data, to develop a structure model for synthetic, hydrated amorphous calcium carbonate (ACC). The ACC is revealed to consist of a porous calcium-rich framework that supports interconnected channels containing water and carbonate molecules. The existence of a previously unrecognized nanometer-scale channel network suggests mechanisms of how additives can be accommodated within the structure and provide temporary stabilization, as well as influence the crystallization process. Moreover, while lacking long-range order, the calcium-rich framework in the ACC contains similar Ca packing density to that present in calcite, aragonite, and vaterite, yielding clues of how the amorphous material converts into the different crystalline forms. Our results provide a new starting point for advancing our understanding of biomineralization as well as the development of biomimetic approaches to next-generation materials synthesis.