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Reverse microemulsion techniques combined with templating strategies have led to the synthesis of four types of nanoparticles. First, homogeneous SiO 2 -coated Fe 2 O 3 (SiO 2 /Fe 2 O 3 ) nanoparticles with controlled SiO 2 shell thickness (1.8−30 nm) were synthesized by reverse microemulsion. These nanocomposite particles were used as templates for the deposition of a mesoporous silica shell. The iron oxide core in SiO 2 /Fe 2 O 3 could be partially and completely etched to produce rattle-type SiO 2 /Fe 2 O 3 nanoballs and hollow SiO 2 nanoballs, respectively. These facile synthetic methods led to the formation of different nanoparticle architectures with tailored silica shell thickness and porosity.
Yi et al. (Sat,) studied this question.