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首页> 外文期刊>Chemistry: A European journal >Partial Oxidation as a Rational Approach to Kinetic Control in Bioinspired Magnetite Synthesis
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Partial Oxidation as a Rational Approach to Kinetic Control in Bioinspired Magnetite Synthesis

机译：部分氧化是生物启发磁铁矿合成动力学控制的合理方法

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摘要

Biological systems show impressive control over the shape, size and organization of mineral structures, which often leads to advanced physical properties that are tuned to the function of these materials. Such control is also found in magnetotactic bacteria, which producein aqueous medium and at room temperaturemagnetite nanoparticles with precisely controlled morphologies and sizes that are generally only accessible in synthetic systems with the use of organic solvents and/or the use of high-temperature methods. The synthesis of magnetite under biomimetic conditions, that is, in water and at room temperature and using polymeric additives as control agents, is of interest as a green production method for magnetic nanoparticles. Inspired by the process of magnetite biomineralization, a rational approach is taken by the use of a solid precursor for the synthesis of magnetite nanoparticles. The conversion of a ferrous hydroxide precursor, which we demonstrate with cryo-TEM and low-dose electron diffraction, is used to achieve control over the solution supersaturation such that crystal growth can be regulated through the interaction with poly-(,)-dl-aspartic acid, a soluble, negatively charged polymer. In this way, stable suspensions of nanocrystals are achieved that show remanence and coercivity at the size limit of superparamagnetism, and which are able to align their magnetic moments forming strings in solution as is demonstrated by cryo-electron tomography.
机译：生物系统对矿物结构的形状，大小和组织显示出令人印象深刻的控制力，这通常会导致先进的物理特性，这些特性可以根据这些材料的功能进行调整。在趋磁细菌中也发现了这种控制，该趋磁细菌在水性介质中和在室温下产生磁铁矿纳米颗粒，其具有精确控制的形态和尺寸，通常仅在使用有机溶剂和/或使用高温方法的合成系统中才能达到。在仿生条件下，即在水中和室温下，并使用聚合物添加剂作为控制剂，合成磁铁矿作为磁性纳米粒子的绿色生产方法受到关注。受磁铁矿生物矿化过程的启发，通过使用固体前驱体来合成磁铁矿纳米颗粒采用了合理的方法。我们通过低温TEM和低剂量电子衍射证明了氢氧化亚铁前体的转化，可用于控制溶液过饱和，从而可通过与poly-（-）-dl-的相互作用来调节晶体的生长。天冬氨酸，一种可溶的，带负电荷的聚合物。以这种方式，获得了纳米晶体的稳定悬浮液，该悬浮液在超顺磁性的尺寸极限处显示出剩磁和矫顽力，并且能够使它们的磁矩排列成溶液中的线，如低温电子断层扫描所证明的。

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