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Magnetite (Fe 3 O 4 ) and metallic iron (Fe) nanoparticles (NPs) were encapsulated in mesoporous silica, SBA-15, with two pore diameters (6.4 and 15.8nm) via vacuum-assisted impregnation and reduction in hydrogen gas. The formation of iron (II) silicate (Fe 2 SiO 4 ) was successfully avoided by using a relatively low reducing temperature (510°C) for the reduction of...
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