Development of Diamond-shaped Particle Assemblies Using Magnetic Interaction

研究了利用空心核壳磁性粒子制备四边形粒子组件的方法。首先，作为hcs磁性颗粒的模型化合物，成功制备了钛芯硅壳型hcs颗粒，并对其在有机合成反应中的光催化活性进行了测试。然后，尝试通过在磁铁矿氧化铁颗粒上涂覆无定形碳和二氧化硅，然后煅烧去除碳层来制备hcs磁性颗粒，得到具有颗粒组合体磁芯的hcs磁性颗粒，可能是由于氧化铁颗粒之间的强磁相互作用。尝试了制备非磁性hcs颗粒后进行磁化的另一种策略，并证实了后一种磁化反应。利用非磁性赤铁矿氧化铁颗粒制备非磁性hcs颗粒，因其聚集性而失败。

Preparation method for article assemblies of tetragonal shape using hollow core-shell (hcs) magnetic particles were investigated. First, as a model compound of hcs magnetic particles, titania-core silica-shell hcs particles were successfully prepared and checked their photocatalytic activity for organic synthetic reactions. Then, preparation of hcs magnetic particles through coating of magnetite iron oxide particles with amorphous carbon and silica followed by calcination for removal of carbon layer was tried to obtain hcs magnetic particles with magnetic core of particles assemblies, presumably due to strong magnetic interaction between iron oxide particles. Another strategy for hcs magnetic particles by preparation of non-magnetic hcs particles followed by magnetization was attempted and the latter magnetization reaction was confirmed. The preparation of non-magnetic hcs particles using non-magnetic hematite iron oxide particles was failed due to aggregation.