A pH-Sensitive Injectable Nanoparticle Composite Hydrogel for Anticancer Drug Delivery

Figure 5

SEM images of different hydrogel as a function of nanoparticle concentration: (a) hydrogel without nanoparticle, (b) hydrogel with 0.8 mg/mL nanoparticle, (c) hydrogel with 1.6 mg/mL nanoparticle, and (d) hydrogel with 3.2 mg/mL nanoparticle.

(a)

(b)

(c)

(d)