Effects of Mg and Hydrogel Solid Content on the Crystallization of Calcium Carbonate in Biomimetic Counter-diffusion Systems
Effects of Mg and Hydrogel Solid Content on the Crystallization of Calcium Carbonate in Biomimetic Counter-diffusion Systems
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DOI：
10.1021/cg500938k
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发表时间：
2014-08
影响因子：
3.8
通讯作者：
Fitriana Nindiyasari;E. Griesshaber;L. Fernández-Díaz;J. M. Astilleros;N. Sánchez-Pastor;A. Ziegler;W. Schmahl
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文献类型：
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作者：
Fitriana Nindiyasari;E. Griesshaber;L. Fernández-Díaz;J. M. Astilleros;N. Sánchez-Pastor;A. Ziegler;W. Schmahl
碳酸盐生物矿物是一种有机和矿物成分密切相关的纳米复合材料。在这里，我们研究了在生长培养基中Mg （0.01 M）存在下明胶水凝胶（固体含量为2.5 wt %和10 wt %）中CaCO3的结晶。在所有实验中，沉淀主要由方解石组成。观察到各种各样的形态和掺入的Mg含量（在10 wt %明胶中生长的球状聚集体中高达26 mol %）。蚀刻实验揭示了方解石晶体聚集体中无机组分与聚合物网络之间的密切关系。在不同固体含量的水凝胶中，该网络的特征有所不同。当生长培养基中不存在Mg时，我们获得了200 nm至1 μm厚的掺入物，其两侧由精致的明胶网络包围。随着Mg的加入，掺入物变得更薄（~ 50-60 nm），明胶网络变得紧凑。电子后向散射衍射证明了钙…
Carbonate biominerals are nanocomposites with an intimate association of organic and mineral components. Here we investigate the crystallization of CaCO3 in gelatin hydrogels (2.5 and 10 wt % solid content) in the presence of Mg (0.01 M) in the growth medium. The precipitate consisted mainly of calcite in all experiments. A wide variety of morphologies and incorporated Mg contents (up to 26 mol % in sphere-like aggregates grown in 10 wt % gelatin) was observed. Etching experiments uncovered an intimate relationship between the inorganic component and a polymeric network in the calcite crystal aggregates. The characteristics of this network varied for hydrogels with different solid contents. When Mg was not present in the growth medium, we obtained 200 nm to 1 μm thick incorporations that were bordered on both sides by a delicate gelatin network. As Mg was added, the incorporations became thinner (∼50–60 nm), and the gelatin network became compact. Electron backscatter diffraction evidenced that the calcit...