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首页> 外文期刊>Crystal growth & design >Tuning the Incorporation of Magnesium into Calcite during Its Crystallization from Additive-Free Aqueous Solution
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Tuning the Incorporation of Magnesium into Calcite during Its Crystallization from Additive-Free Aqueous Solution

机译：在从无添加剂水溶液中将镁在方解石中调整到方解石中

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摘要

Under ambient conditions, marine organisms are able to synthesize a variety of functional materials, ranging from eye lenses to protective shells through the meticulous control over magnesium incorporation into calcite during its crystallization. The mechanistic understanding of how they achieve such exquisite control, at a constant magnesium-to-calcium ratio and at ambient conditions, is important in the development of bioinspired functional materials. However, the replication of these processes in the laboratory is still challenging. Herein, we present a systematic study on how to tune magnesium incorporation into calcite and polymorph selection in the Ca-Mg-CO3 system through the precise control of the inorganic solutions chemistry at ambient conditions of temperature and pressure, and at a magnesium-to-calcium ratio of 5:1, which is analogous to the ratio found in most seas. By varying the pH, cation-to-anion ratio, and solution concentration, the controlled synthesis of magnesium calcites with 10-45% magnesium was achieved at room temperature. The mechanism of formation is consistent with that observed during biomineralization, during which an intermediate magnesium-rich amorphous calcium carbonate (Mg-ACC) phase forms first and later transforms into high magnesium calcite. Once crystallization occurs, the magnesium calcites that form are stable in solution and exhibit slow growth through Ostwald ripening. Our findings suggest that the precise control of saturation levels is key in driving nucleation and crystallization.
机译：在环境条件下，海洋生物能够合成各种功能材料，从眼睛镜片到保护壳，通过细致的控制在其结晶过程中镁掺入方解石。在恒定的镁 - 钙比和环境条件下，它们如何实现这种精致控制的机械理解在生物悬浮功能材料的发展中是重要的。然而，在实验室中的这些过程的复制仍然具有挑战性。在此，我们通过在环境温度和压力环境条件下的无机溶液化学的精确控制和镁 - 至 - 钙比为5：1，类似于大多数海域的比例。通过改变pH，阳离子 - 阴离子比和溶液浓度，在室温下实现了具有10-45％镁的镁钙的控制合成。形成的机理与生物碳化期间观察到的形成机制，在此期间，首先将中间体富含富含镁的无定形碳酸钙（Mg-ACC）相和后来转化为高镁脑制剂。一旦发生结晶，镁的钙质在溶液中是稳定的，并且通过Ostwald成熟表现出缓慢的生长。我们的研究结果表明，饱和度水平的精确控制是驱动成核和结晶的关键。

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