Novel method to fabricate magnetic hollow silica particles with anisotropic structure

Magnetic Fe3O4/SiO2 particles with rod-like structure and hollow interior have been constructed by a template method. During this procedure, β-FeOOH was firstly synthesized as the rod-like template to fabricate β-FeOOH/SiO2 core/shell-like particles. These β-FeOOH/SiO2 nanorods could be further transformed to Fe3O4/SiO2 via the decomposition-reducing method. These particles showed ferromagnetic behavior at room temperature with high coercivity and may provide potential applications in biological area.