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首页> 外文期刊>Advanced Powder Technology: The internation Journal of the Society of Powder Technology, Japan >Novel mechanochemical process for synthesis of magnetite nanoparticles using coprecipitation method
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Novel mechanochemical process for synthesis of magnetite nanoparticles using coprecipitation method

机译：共沉淀法合成磁铁矿纳米粒子的新机械化学过程

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摘要

A novel coprecipitation method using a high mechanical energy field as the synthesis reaction system of magnetite (Fe3O4) has been developed for preparing the superparamagnetic Fe3O4 nanoparticles with high crystallinity in water system. In the synthesis process, the suspension containing the precipitates of ferrous hydroxide and goethite was treated in a tumbling ball mill under a cooling condition. The mechanical energy generated by collision of ball media promoted the Fe3O4 formation reaction and simultaneously crystallized the formed Fe3O4 nanoparticles without using any conventional heating techniques by means of the mechanochemical effect. The collision energy of ball media was numerically analyzed by discrete element simulation of their motion in the ball mill. Size, crystallinity and magnetization of the Fe3O4 nanoparticles obtained under different ball-milling conditions were almost the same regardless of the amount of the collision energy. However, the reaction rate of Fe3O4 formation increased with the collision energy, which was analogous to increase of the reaction rate caused by increase of the heat energy applied to the reaction system. The reaction rate depended strongly on the number of collisions with the energy larger than a threshold value corresponding to the activation energy in this reaction system.
机译：开发了一种利用高机械能场作为磁铁矿（Fe3O4）合成反应体系的新型共沉淀方法，用于制备水体系中结晶度高的超顺磁性Fe3O4纳米粒子。在合成过程中，将含有氢氧化亚铁和针铁矿沉淀物的悬浮液在转鼓式球磨机中在冷却条件下进行处理。球介质碰撞产生的机械能促进了Fe3O4的形成反应，并同时使形成的Fe3O4纳米粒子结晶，而无需使用任何常规的加热化学技术进行机械化学作用。通过球磨机中运动的离散元模拟，对球状介质的碰撞能量进行了数值分析。在不同球磨条件下获得的Fe3O4纳米粒子的尺寸，结晶度和磁化强度几乎相同，而与碰撞能量的大小无关。然而，Fe 3 O 4形成的反应速率随碰撞能量而增加，这类似于由于施加至反应体系的热能增加而引起的反应速率的增加。反应速率在很大程度上取决于碰撞次数，其能量大于该反应系统中对应于活化能的阈值。

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