Microbial-Physical Synthesis of Fe and Fe₃O₄ Magnetic Nanoparticles Using Aspergillus niger YESM1 and Supercritical Condition of Ethanol

Figure 4

SEM micrographs of (a, b) FeS nanoparticles trapped by Aspergillus niger and (c) Fe₂O₃ nanoparticles formed by Aspergillus niger (c).

(a)

(b)

(c)