Figure 4: ((a) and (b)) The TEM images of the laboratory-synthesized iron nanoparticles (SNZVI). The TEM diameter of aggregates in chains of SNZVI 190, 230, and 8.63, the micrograph of nanoparticle agglomerate showing the core-shell morphology and the variation in shell thickness observed at different locations of the agglomerate. Also, the figures show phase contrast TEM image showing a continuous surface amorphous layer that encapsulates the agglomerate. ((c) and (d)) The scale bar is 100 nm for image. The finer nanoparticles were packing together into larger particles with diameter of 39.11 nm.