Figure 2From: Tunable synthesis of SiO2-encapsulated zero-valent iron nanoparticles for degradation of organic dyesSEM images of the samples synthesized with different initial concentrations of Fe2+. (a) and (b) S-0.5, (c) and (d) S-1, (e) and (f) S-2, (g) and (h) S-4, and (i) and (j) S-8.Back to article page