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A kinetic model of the transformation of a micropatterned amorphous precursor into a porous single crystal.

机译:微图案化的非晶态前体转变成多孔单晶的动力学模型。

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摘要

Biogenic single crystals with complex shapes are believed to be generated by the crystallization of an amorphous precursor. Recent biomimetic experiments on the crystallization of calcite via amorphous-to-crystalline transition point to the fact that the transformation kinetics may be controlled by the micropattern and the macroscopic shape of the amorphous precursor phase. Here we analyse a simple kinetic model, based on thermodynamic considerations, showing that the presence of cavities in the micropatterned precursor phase might interfere with the transformation process and control its kinetics. The size of the cavities couples to the total surface energy and, hence, to crystal nucleation and growth, while the spacing of the cavities, as compared to the typical diffusion path, controls the possible nucleation of competing crystals.
机译:据信具有复杂形状的生物单晶是由无定形前体的结晶产生的。最近的关于通过无定形到晶体转变的方解石结晶的仿生实验表明,这一转变动力学可以通过无定形前体相的微观图案和宏观形状来控制。在这里,我们基于热力学考虑,分析了一个简单的动力学模型,表明在微图案化前体相中存在空腔可能会干扰转化过程并控制其动力学。空腔的尺寸与总表面能耦合,因此与晶体成核和生长耦合,而与典型的扩散路径相比,空腔的间距控制了竞争晶体的可能成核。

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