Abstract
The formation of γ-Fe2O3 nanoparticles embedded in a silica matrix has been studied in low-pressure premixed flames of hydrogen and oxygen. The organometallic precursors iron-pentacarbonyl (Fe(CO)5) and tetramethylsilane (Si(CH3)4) were used as starting materials for the core particles and matrix material, respectively. Fe2O3 particles with a diameter of about 3–7nm were successfully embedded in a surrounding silica matrix of about 9–13nm in diameter. The iron oxide particle kernels are superparamagnetic at room temperature.
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