In vitro synthesis and structural characterization of amorphous calcium carbonate
In vitro synthesis and structural characterization of amorphous calcium carbonate
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DOI：
10.1002/zaac.200500164
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发表时间：
2005-01-01
影响因子：
1.4
通讯作者：
Epple, M
中科院分区：
文献类型：
--
作者：
Günther, C;Becker, A;Epple, M
无定形碳酸钙（ACC）是用什么方法制备的呢？通过不同的方法。由二氧化碳和氢氧化钙水溶液制备得到了完全X射线无定形相，没有任何添加剂。在镁或乙二胺-N，N，N ′，N ′-四亚甲基膦酸（EDTMP）存在下，由氯化钙和碳酸钠沉淀也得到完全无定形的固体。所有ACC相含有约7wt%的残余水，并且在与气态或液态水接触时转化成结晶相。这些材料是生物ACC的模型化合物，生物ACC在生物矿化中作为功能材料或作为方解石或文石的过渡相具有重要意义。如果ACC准备好了呢？在没有任何添加剂的情况下，可以通过X射线吸收光谱（EXAFS）确定钙周围的明显短程有序。无添加剂的ACC在加热或与水接触时仅转化为结晶方解石，因此可以作为生物学上发现的瞬时前体相的模型化合物。
Amorphous calcium carbonate (ACC) was prepared it? vitro by different methods. The preparation from carbon dioxide and aqueous calcium hydroxide gave a fully X-ray amorphous phase without any additive. The precipitation from calcium chloride and sodium carbonate in the presence of either magnesium or ethylene-diamine-N,N,N',N'-tetrakis-methylene-phosphonic acid (EDTMP) also gave fully amorphous solids. All ACC phases contained about 7 wt% of residual water and transformed into crystalline phases upon contact with gaseous or liquid water. These materials are model compounds for biogenic ACC which is of importance in biomineralisation either as functional material or as a transient phase on the way to calcite or aragonite. If ACC is prepared it? vitro without any additive, a clear short-range order around calcium can be determined by X-ray absorption spectroscopy (EXAFS). Additive-free ACC converts exclusively to crystalline calcite upon heating or in contact with water and may therefore act as a model compound for biologically found transient precursor phases.