ChemInform Abstract: Synthesis and Properties of γ-Fe2O3 Nanoclusters within Mesoporous Aluminosilicate Matrices.
Abstract
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ChemInform Abstract
Nanoclusters of γ-Fe2O3 are synthesized within mesoporous MCM-41 aluminosilicate matrices by evaporation-condensation of volatile Fe(CO)5. The samples are characterized by XRD, TEM, and STEM. Magnetization measurements and Moessbauer spectroscopy indicate that the γ-Fe2O3/MCM-41 nanocomposites exhibit interesting superparamagnetic behavior. A blue shift in the absorption edge is noted in the optical spectrum of the nanocomposite system. The unique magnetic and optical properties are associated with quantum confinement effects and particle-support interactions. The high thermal stability and increased magnetization after high temp. calcination make this material an excellent candidate for high-temperature applications.
