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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.