Preparation of a Microporous Polyurethane Film with Negative Surface Charge for siRNA Delivery via Stent

Figure 5

Images and contact angles of water droplets on the porous PU film (a), on a PU film coated with 0.1% P(MMA-co-MAA) solution (b), and on a PU film coated with 2% P(MMA-co-MAA) (c).

(a)

(b)

(c)