Formation of single-crystalline aragonite tablets/films via an amorphous precursor
Formation of single-crystalline aragonite tablets/films via an amorphous precursor
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DOI：
10.1021/la061960n
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发表时间：
2007-02-13
期刊：
影响因子：
3.9
通讯作者：
Volkmer, Dirk
中科院分区：
文献类型：
--
作者：
Amos, Fairland F.;Sharbaugh, Denise M.;Volkmer, Dirk
使用可溶性加工导向剂和基于间苯二酚的朗缪尔单层，通过无定形前体途径在空气-水界面生长碳酸钙薄片和薄膜。通过使用适当浓度的聚丙烯酸钠盐与 Mg2+ 离子结合，在单层模板上沉积了最初的非晶态薄膜，随后结晶成由方解石和文石的单晶和球晶斑块的混合物组成的马赛克薄膜。特别重要的是单晶文石“片”（厚度约为 600 nm）的合成，因为该相在体外生长时通常形成针状多晶聚集体。据我们所知，文石的板状单晶形态仅在软体动物壳的珠光层中观察到。因此，该体外系统可以作为检查与生物矿化相关的机械问题的有用模型，例如有机模板对非晶相成核的影响。
Thin tablets and films of calcium carbonate have been grown at the air-water interface via an amorphous precursor route using soluble process-directing agents and a Langmuir monolayer based on resorcarene. By using appropriate concentrations of poly(acrylic acid-sodium salt) in combination with Mg2+ ion, an initially amorphous film is deposited on the monolayer template, which subsequently crystallizes into a mosaic film composed of a mixture of single-crystalline and spherulitic patches of calcite and aragonite. Of particular importance is the synthesis of single-crystalline "tablets" of aragonite (similar to 600 nm thick), because this phase generally forms needle-like polycrystalline aggregates when grown in vitro. To our knowledge, a tabular single-crystalline morphology of aragonite has only been observed in the nacreous layer of mollusk shells. Therefore, this in vitro system may serve as a useful model for examining mechanistic issues pertinent to biomineralization, such as the influence of organic templates on nucleation from an amorphous phase.