Tailoring Calcite Growth through an Amorphous Precursor in a Hydrogel Environment,Crystal Growth & Design

当前位置： X-MOL 学术 › Cryst. Growth Des. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Tailoring Calcite Growth through an Amorphous Precursor in a Hydrogel Environment
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2019-05-09 00:00:00 , DOI: 10.1021/acs.cgd.9b00062
Josue A. Lopez-Berganza ₁ , Siyu Chen ₂ , Rosa M. Espinosa-Marzal _{1,

2}

Affiliation

The precipitation of calcium carbonate in hydrogel-like environments is used by certain living organisms to build functional mineral–organic composite structures. Here, we investigate a pathway for calcium carbonate mineralization in agarose hydrogels with a wide range of polymer networks. The experimental investigation demonstrates that the formation of amorphous calcium carbonate (ACC) throughout the agarose hydrogels is a diffusion-limited process, and therefore, it is affected by the supersaturation of the solution and by the hydrogel network. In contrast, the inclusion of the polymer into the calcite crystals and their morphology as well as the rate of crystal growth are controlled by the amorphous precursor, and thereby, they are quite unaffected by the initial supersaturation. The nucleation rate of calcite in agarose is sufficiently high to hinder ion diffusion limiting the calcite growth rate, so that a uniform mineralization takes place in the hydrogel, in the absence of concentration gradients. This work demonstrates that the precipitation of ACC affords a tight control of calcium carbonate mineralization in the hydrogel over a wide range of calcium carbonate concentrations and hydrogel microstructures. The results of this work not only reveal an important mechanism underlying (bio)mineralization, but they can also inspire a new avenue to craft biomimetic materials with a high degree of precision.

中文翻译：

在水凝胶环境中通过无定形前体来调整方解石的生长

碳酸钙在类似水凝胶的环境中的沉淀被某些活生物体用来建立功能性的矿物-有机复合结构。在这里，我们研究了具有广泛的聚合物网络的琼脂糖水凝胶中碳酸钙矿化的途径。实验研究表明，在整个琼脂糖水凝胶中形成无定形碳酸钙（ACC）是一个扩散受限的过程，因此，它受溶液的过饱和度和水凝胶网络的影响。相反，聚合物被包含在方解石晶体中以及它们的形态以及晶体的生长速度受非晶态前体的控制，因此，它们不受初始过饱和的影响。琼脂糖中方解石的成核速率足够高，以阻止离子扩散，限制了方解石的生长速率，因此在没有浓度梯度的情况下，水凝胶中会发生均匀的矿化作用。这项工作表明，ACC的沉淀可以在很宽的碳酸钙浓度和水凝胶微观结构范围内严格控制水凝胶中碳酸钙的矿化作用。这项工作的结果不仅揭示了（生物）矿化的重要机制，而且还为开发仿生材料的高精度开辟了一条新途径。这项工作表明，ACC的沉淀可以在很宽的碳酸钙浓度和水凝胶微观结构范围内严格控制水凝胶中碳酸钙的矿化作用。这项工作的结果不仅揭示了（生物）矿化的重要机制，而且还为开发仿生材料的高精度开辟了一条新途径。这项工作表明，ACC的沉淀可以在很宽的碳酸钙浓度和水凝胶微观结构范围内严格控制水凝胶中碳酸钙的矿化作用。这项工作的结果不仅揭示了（生物）矿化的重要机制，而且还为开发仿生材料的高精度开辟了一条新途径。

更新日期：2019-05-09

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南