Figure 4
From: Nearly Perfect Durable Superhydrophobic Surfaces Fabricated by a Simple One-Step Plasma Treatment
Stability of superhydrophobicity of the fabricated PTFE sheets as a function of excessive water dripping time. (A) In the water dripping test, water droplets (~8.6 μL) impacted the PTFE inclined at 45° from h = 10 cm at a rate of one drop per second. (B) Variation of the water contact angle of the superhydrophobic surfaces with the lapse of time for 6 h of water dripping of Yildirim, et al. (marked by black square), Wang, et al. (marked by blue upper-triangle), and the present superhydrophobic PTFE (marked by red circle). The contact angle of the fabricated superhydrophobic PTFE is slightly decreased, similar to that of the other results. (C) SEM images of the superhydrophobic surfaces after the water dripping test. The mark of droplets impacting on the surfaces was remained at the specific point where the water droplet impacted (left). The enlarged image shows that the nanostructures of the initial superhydrophobic surface are almost maintained (right).
