Figure 6.

Contact angle of superhydrophobic coating prepared after UV irradiation (nanoparticle ratio was 4:2, and the amount of PDMS was 1 g) for (a) various times and (b) tape peeling for different cycles. (c) Changes in the contact angle and sliding angle when the superhydrophobic film was immersed in hydrochloric acid solution or sodium hydroxide solution (pH = 1–14) for 72 h; SEM image (d) after tape peeling for 250 cycles and (e,f) for samples immersed in HCl solution (pH = 2) and NaOH solution (pH = 14) for 72 h.