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. 2018 Sep 14;4(9):eaat7392. doi: 10.1126/sciadv.aat7392

Fig. 2. Microstructures and wettability of the graphene sponge film and the PIPGF.

Fig. 2

(A to D) SEM images of (A and B) the graphene sponge film and (C and D) the PIPGF. (A) and (C) are the surfaces, and (B) and (D) are the cross sections of the corresponding film. (E) Measured water contact angles of the porous graphene sponge film, the PIPGF with laser switched on, and the PIPGF with laser switched off, respectively. (F) Progress of the water droplet sliding down the surface of the PIPGF with laser switched on; the sliding angle of which is 5°. (G) Progress of the water droplet sliding down the surface of the PIPGF with laser switched off; the sliding angle of which is 87°. (H) Water sliding angle variation of the PIPGF as a function of laser cycle numbers. Scale bars, 10 μm.