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A sol-gel procedure was used to cover Fe3O4 nanoparticles with SiO2 shell, forming a core/shell structure. The core/shell nanocomposites were synthesized by a two-step process. First, Fe3O4 nanoparticles were obtained through co-precipitation and dispersed in aqueous solution through electrostatic interactions in the presence of tetramethylammonium hydroxide (TMAOH). In the second step, Fe3O4 was...
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