Fig. 2

Characterization of MAgNPs using scanning electron microscopy (SEM) at different magnifications. SEM revealed that Magnolia silver nanoparticles (MAgNPs) had a mean diameter of 40 nm and were spherical, as shown at 1 μm (A), 500 nm (B and C), and 300 nm (D). At higher concentrations, MAgNPs aggregate and appear as grape-like clusters (C).