Figure 2
From: Facile synthesis of flexible macroporous polypropylene sponges for separation of oil and water
The flexibility of a large-size PP sponge (5 mm × 130 mm × 170 mm) (A), SEM image of the PP sponge (B), a toluene droplet (dyed with oil red) on the surface of the PP sponge with an oil contact angle of 0o and a water droplet on the surface of the PP sponge with a water contact angle of 130o (C).
