Nanoscale Patterning of Microtextured Surfaces to Control Superhydrophobic Robustness
- Nanoscale Patterning of Microtextured Surfaces to Control Superhydrophobic Robustness
- 차태곤; 이진우; 문명운; 이광렬; 김호영
- superhydrophobic; CF4; DLC; nanopillar; biomimetic; surface treatment
- Issue Date
- VOL 26, NO 11, 8319-8326
- Most naturally existing superhydrophobic surfaces have a dual roughness structure where the entire microtextured
area is covered with nanoscale roughness. Despite numerous studies aiming to mimic the biological surfaces, there is a
lack of understanding of the role of the nanostructure covering the entire surface. Here we measure and compare the
nonwetting behavior of microscopically rough surfaces by changing the coverage of nanoroughness imposed on them.
We test the surfaces covered with micropillars, with nanopillars, with partially dual roughness (where micropillar tops
are decorated with nanopillars), and with entirely dual roughness and a real lotus leaf surface. It is found that the
superhydrophobic robustness of the surface with entirely dual roughness, with respect to the increased liquid pressure
caused by the drop evaporation and with respect to the sagging of the liquid meniscus due to increased micropillar
spacing, is greatly enhanced compared to that of other surfaces. This is attributed to the nanoroughness on the pillar
bases that keeps the bottom surface highly water-repellent. In particular, when a drop sits on the entirely dual surface
with a very low micropillar density, the dramatic loss of hydrophobicity is prevented because a novel wetting state is
achieved where the drop wets the micropillars while supported by the tips of the basal nanopillars.
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