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首页> 外文期刊>Chemical geology >Biomimetic mineralization of prismatic calcite mesocrystals: Relevance to biomineralization
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Biomimetic mineralization of prismatic calcite mesocrystals: Relevance to biomineralization

机译：方解石方晶介晶的仿生矿化：与生物矿化的相关性

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Morphological control during mineral crystallization is one of the prominent hallmarks of biomineralization. Organisms can employ some of functional macromolecules to produce crystals with special morphologies at particular tissue sites. In this article, a pluronic triblock copolymer (F68 or F127) was used as a model organic additive for the purpose of influencing the crystallization and growth of calcium carbonate in a biomimetic mineralization process. Structure and morphology of the products were investigated using a range of techniques including XRD, FTIR, FESEM, TEM, and SAED. The FESEM and TEM results demonstrate that additive F68 not only preferentially interacts with selected faces of calcite crystals to form elongated microcrystals, it also induces the oriented aggregation of microcrystals along the crystallographic c direction into calcite prisms, i.e., mesocrystal architectures. In addition, a series of time-resolved experiments show that the initial precipitate in the presence of higher concentration F68 was an unstable amorphous calcium carbonate (ACC), and this transient precursor phase eventually transformed into prismatic mesocrystals of calcite, displaying all of features of CaCO_3 biomineralization. Because F68 only contains ether-oxygen and terminal hydroxyl functional groups, its role in the crystallization of CaCO_3 is considered as an analogue to an array of biomineralization-associated biomacromolecules such as some glycosylated proteins. Hence, our results suggest that the -C-O-C- groups (ether or glycosidic group) in biomineralization-associated biomacromolecules not only influence the mineralization process, but also contribute to the special morphogenesis of CaCO_3. As such, this provides a new insight into the biomineralization mechanism.
机译：矿物结晶过程中的形态控制是生物矿化的重要标志之一。有机体可以利用某些功能性大分子在特定组织部位产生具有特殊形态的晶体。在本文中，普鲁尼克三嵌段共聚物（F68或F127）用作模型有机添加剂，目的是在仿生矿化过程中影响碳酸钙的结晶和生长。使用包括XRD，FTIR，FESEM，TEM和SAED在内的一系列技术研究了产品的结构和形态。 FESEM和TEM结果表明，添加剂F68不仅优先与方解石晶体的选定面相互作用以形成拉长的微晶，而且还诱导微晶沿晶体c方向定向聚集为方解石棱镜，即中晶结构。此外，一系列时间分辨实验表明，在较高浓度的F68存在下，最初的沉淀物是不稳定的无定形碳酸钙（ACC），该瞬态前体相最终转变为方解石的棱柱形介晶，显示出CaCO_3生物矿化。由于F68仅包含醚氧和末端羟基官能团，因此其在CaCO_3结晶中的作用被认为是一系列与生物矿化相关的生物大分子（例如某些糖基化蛋白质）的类似物。因此，我们的结果表明，与生物矿化相关的生物大分子中的-C-O-C-基团（醚基或糖苷基）不仅影响矿化过程，而且有助于CaCO_3的特殊形态发生。因此，这为生物矿化机制提供了新的见识。

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