Fig. 3

SEM/EDAX images of beads with different GO concentrations and under various pH conditions, without and with drug loaded/released. a Control hydrogel bead; (b) EDAX for control hydrogel beads; (c) 10GO (inset, image of rods); (d) EDAX for 10GO on plain matrix (inset, image of rods); (e) 25GO; (f) EDAX for 25GO; (g) 50GO; (h) EDAX for 50GO; (i) drug-loaded hydrogel beads (pH 6.3) (inset, images of flowery and rod-like structures); (j) EDAX for pH 6.3 (inset, images of rods); (k) pH 7.0 (inset, images of rods); (l) EDAX for pH 7.0 (inset, images of rods); (m) pH 8.0; (n) EDAX for pH 8.0; (o) pH 9.0; (p) EDAX for pH 9.0