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Fabrication of superparamagnetic macroporous Fe₃O₄ and its derivates using colloidal crystals as templates

Cong, Hailin, Yu, Bing
Journal of colloid and interface science 2011 v.353 no.1 pp. 131-136
carbon nanotubes, catalytic activity, chemical reduction, colloids, composite polymers, crystals, cyclic ethers, ferric oxide, heterocyclic oxygen compounds, iron, iron oxides, magnetic properties, nanoparticles, oxidation, porosity, silicon, surfaces, vapors
In this paper, we reported the preparation of superparamagnetic macroporous Fe₃O₄ and its derivates using organic colloidal crystal as templates and their catalytic activity for chemical vapor deposition. The poly(styrene-methyl methacrylate-acrylic acid) (P(St-MMA-AA)) copolymer colloids were deposited in an orderly manner onto the silicon surface, together with the infiltration of the Fe₃O₄ nanoparticles into the interspaces of the colloids. The formed hybrid colloidal crystal subsequently was immersed in tetrahydrofuran to remove the organic components fully to obtain a macroporous Fe₃O₄ framework with three-dimensional porous structure. The macroporous Fe₃O₄ exhibits superparamagnetism due to the magnetic coupling of Fe₃O₄ nanoparticles in the structure. Macroporous Fe₂O₃ and Fe materials were obtained based on oxidization and reduction of the macroporous Fe₃O₄, respectively. It was demonstrated that the macroporous Fe₃O₄ materials possess catalytic activity and can induce growth of carbon nanotubes.