Prussian Blue (PB) mesocrystals have been prepared by a facile hydrothermal method directly. PB nanoparticles aggregate together in an oriented way to form a hierarchical structure.
Synthesis controlled by an external magnetic field is a popular and effective method in the preparation of magnetic materials. To know the influence of the distribution of magnetic lines of force on the growth of magnetic materials allows a deep understanding of the mechanism of crystal growth controlled by an external magnetic field and suggests the optimal field for fabrication of magnetic materials. In this paper, we report how the distribution of magnetic lines of force influences the growth of Ni crystals by synthesizing them at different regions of an external magnetic field. Ni crystals grow into wire-like structures in the presence of parallel magnetic lines of force, while spherical and hemispherical structures coexist with wire-like structures in the presence of unparallel magnetic lines of force. The self-generated magnetic field of magnetized Ni crystals should be responsible for the shape variation. The distribution of external magnetic lines of force and self-generated magnetic field of ferromagnetic materials should be taken into account when ferromagnetic materials are fabricated in the presence of an external magnetic field.
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