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Fe3O4 core/layered double hydroxide shell nanocomposite: versatile magnetic matrix for anionic functional materials.

Recently, microor nanospheres with magnetic cores and functional shell structures have received much attention because of their potential applications in catalysis, drug storage/release, selective separation, chromatography, and chemical or biosensors. Until now, different shell frameworks have been developed to pursue these aims. Some groups fabricated mesoporous silica shell to load metal oxides and fluorescence imaging materials and used them in catalysis and drug storage/release systems. Diat et al. discovered that monodisperse and compactly packed onion phases could be obtained in concentrated solutions of surfactants under controlled mechanical shear. Their applications as carriers for drug delivery or nanoreactors for the synthesis of metal nanoparticles have been explored. Wang et al. used dimercaptosuccinimide acid modified Fe2O3 nanoparticles and combined them with CdSe/ZnS quantum dots (QDs) to prepare water soluble magnetic luminescent composites in an organic/water two-phase mixture. Bawendi and co-workers simultaneously encapsulated both CdSe QDs and g-Fe2O3 in silica microspheres to prepare a magnetic luminescent composite. All these exploitations of the shell structure greatly expand the realm of applications of magnetic core/ shell materials. However, in all of these applications, the method for loading functional materials into the shell structure is largely different from each other, even for the same shell structures. Is there a facile and versatile approach to synthesize magnetic core/functional shell structures? Layered double hydroxides (LDHs), consisting of stacked brucite-type octahedral layers with anions and water molecules occupying the interlayer space, are currently attracting intense research interest. Recently, we succeeded in total delamination of LDH crystals in nitrate form upon treatment with formamide, and used this product as a building block to fabricate the LDH hollow shell structure. The LDH structure collapsed upon heat treatment at about 500 8C to yield mixed oxides of constituent elements, which underwent restoration of the LDH structure in the presence of water and anions. This so-called memory effect property of LDHs has been employed as an effective synthetic route for inserting various functional inorganic and organic anions into LDHs galleries. 17] Herein, we report the synthesis and characterization of a Fe3O4 core/oxide shell nanocomposite decomposed from a layered double hydroxide, which combines both versatile anion loading capability and high separation efficiency, making it an ideal support for recoverable anionic functional materials. As shown in Figure 1, the center of the structure is a