Synthesis of Iron Oxide Nanoparticles Using Isobutanol

Figure 4

SEM micrographs of iron oxide samples synthesized from 0.09 M FeCl₂·4H₂O with 0.8 M NaOH at 75°C: (a, b) S1 as synthesized; (c, d) S2 calcined at 300°C for 2 h; (e, f) S3 calcined at 500°C for 2 h.

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