Fig. 4

FESEM images of (a a*) pure PVNiMC0, (b b*) PVNiMC1 at 9 mL NiMC, (c c*) PVNiMC2 at 18 mL NiMC, and (d d*) PVNiMC3 at 36 mL NiMC, with magnifications of 10 and 20 μm, respectively.

FESEM images of (a a*) pure PVNiMC0, (b b*) PVNiMC1 at 9 mL NiMC, (c c*) PVNiMC2 at 18 mL NiMC, and (d d*) PVNiMC3 at 36 mL NiMC, with magnifications of 10 and 20 μm, respectively.