Preparation of a Novel Thiol Surface Modifier and Fe₃O₄ Drug Loading Agent as well as Releasing under pH-Sensitivity

Figure 8

SEM images of the products. (a) Fe₃O₄; (b) Fe₃O₄-TIPTS; (c) Fe₃O₄-TIPTS-g-(PEI-co-PEG).

(a)

(b)

(c)