The Investigation of Mixed Ferrofluids Containing Iron Oxide nanoparticles and Microspheres

Figure 2

(a): SEM images of (A) iron oxide (Fe₃O₄) particles slightly agglomerated, (B) oleic acid-coated Fe₃O_4, and (C) PVB-coated Fe₃O₄ particles separated with gaining smoother surface. (b) Schematic representation of the coating with a zoomed view of a single particle. Oleic acid coating attains Fe nanoparticles to yellow-brownish coloration, whereas PVB gives glassy surface to the particles; it can be seen clearly in the SEM (C) images also. (c) Schematic representation of molecular interaction of Fe nanoparticles with a polymeric moiety.