Porous Single Crystals of Calcite from Colloidal Crystal Templates: ACC Is Not Required for Nanoscale Templating
Porous Single Crystals of Calcite from Colloidal Crystal Templates: ACC Is Not Required for Nanoscale Templating
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DOI：
10.1002/adfm.201001366
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发表时间：
2011-03-08
影响因子：
19
通讯作者：
Meldrum, Fiona C.
中科院分区：
文献类型：
--
作者：
Hetherington, Nicola B. J.;Kulak, Alex N.;Meldrum, Fiona C.
本文研究了纳米结构的方解石单晶的形成使用直接，离子-离子沉淀法，并表明，单晶具有复杂的形态和曲面可以很容易地使用这种技术形成。方解石晶体与反蛋白石和直接蛋白石结构的制备分别使用胶体晶体和聚苯乙烯反蛋白石的模板，并实现了良好的复制模板结构，包括形成200 nm的方解石球的直接蛋白石结构。这些高度多孔的晶体还显示出非常规则的结晶总形态。该方法是非常通用的，并挑战了先入为主的观念，即纳米结构的晶体不能通过简单的扩散到模板中的试剂，由于通道的阻塞。结果还讨论了光的替代模板方法，使用无定形碳酸钙（ACC）作为前体相，并提供深入了解ACC在生物钙化过程中的作用。
This article investigates the formation of nanostructured single crystals of calcite using direct, ion-by-ion precipitation methods and shows that single crystals with complex morphologies and curved surfaces can readily be formed using this technique. Calcite crystals with inverse opal and direct opal structures are prepared using templates of colloidal crystals and polystyrene reverse opals, respectively, and excellent replication of the template structures are achieved, including the formation of 200-nm spheres of calcite in the direct opal structure. These highly porous crystals also display extremely regular, crystalline gross morphologies. The methodology is extremely versatile and challenges the preconception that nanostructured crystals cannot be prepared by simple diffusion of reagents into the template due to blocking of the channels. The results are also discussed in light of alternative templating methods using amorphous calcium carbonate (ACC) as a precursor phase and provide insight into the role of ACC in biological calcification processes.