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首页> 外文期刊>Crystal growth & design >A Bioinspired Coprecipitation Method for the Controlled Synthesis of Magnetite Nanoparticles
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A Bioinspired Coprecipitation Method for the Controlled Synthesis of Magnetite Nanoparticles

机译：生物启发的共沉淀法控制磁铁矿纳米粒子的合成

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摘要

Nature often uses precursor phases for the controlled development of crystalline materials with welldefined morphologies and unusual properties. Mimicking such a strategy in in vitro model systems would potentially lead to the water-based, room-temperature synthesis of superior materials. In the case of magnetite (Fe_3O_4), which in biology generally is formed through a ferrihydrite precursor, such approaches have remained largely unexplored. Here we report on a simple protocol that involves the slow coprecipitation of Fe~(III)/Fe~(II) salts through ammonia diffusion, during which ferrihydrite precipitates first at low pH values and is converted to magnetite at high pH values. Direct coprecipitation often leads to small crystals with superparamagnetic properties. Conversely, in this approach, the crystallization kinetics-and thereby the resulting crystal sizes-can be controlled through the NH_3 influx and the Fe concentration, which results in single crystals with sizes well in the ferrimagnetic domain. Moreover, this strategy provides a convenient platform for the screening of organic additives as nucleation and growth controllers, which we demonstrate for the biologically derived M6A peptide.
机译：大自然经常使用前体相来控制晶体材料的形成，这些材料具有明确的形态和特殊的性能。在体外模型系统中模仿这种策略可能会导致高级材料的水基室温合成。在磁铁矿（Fe_3O_4）的情况下，生物学上通常是通过三水铁矿前体形成的，这种方法在很大程度上尚未得到开发。在这里，我们报告了一个简单的协议，该协议涉及通过氨扩散缓慢地沉淀Fe〜（III）/ Fe〜（II）盐，在此过程中，亚铁酸盐首先在低pH值下沉淀，然后在高pH值下转化为磁铁矿。直接共沉淀通常会导致具有超顺磁性的小晶体。相反，在这种方法中，可以通过NH_3流入量和Fe浓度来控制结晶动力学，从而控制晶体尺寸，从而得到在亚铁磁畴中具有良好尺寸的单晶。此外，该策略为筛选作为成核和生长控制剂的有机添加剂提供了一个方便的平台，我们已针对生物衍生的M6A肽进行了演示。

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