Journal
APPLIED SURFACE SCIENCE
Volume 542, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148617
Keywords
Superhydrophobic surface; Impact dynamics; Droplet splashing; Anti-splash; Anodic aluminum oxide
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2019R1A2C1084182]
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The study found that the anti-splashing properties of superhydrophobic surfaces are related to the pore structures, with sealed air pockets leading to more splashing and open air pockets providing better anti-splashing performance.
We used a high-speed camera to investigate the effect of pore structures on the anti-splashing properties of superhydrophobic surfaces. Zinc oxide (ZnO) nanowires with open air pockets and anodic aluminum oxide (AAO) with sealed air pockets were synthesized and subsequently treated with a low-energy self-assembled monolayer to render their surfaces superhydrophobic. The water contact angle of the superhydrophobic ZnO surface (SH-ZnO) was almost identical to that of the superhydrophobic AAO surface (SH-AAO); however, SH-AAO exhibited greater adhesion than SH-ZnO, which we attributed to the difference in the structures of air pockets. In addition, when a water droplet impacted SH-AAO, the surface effectively suppressed droplet splashing because of high adhesion; by contrast, the conventional superhydrophobic surface (i.e., SH-ZnO) promoted droplet splashing because of the presence of an air layer between the impacting water and the solid surface. The anti-splashing behavior of SH-AAO was observed not only for the impact of a water droplet but also for the impact of a water jet on the surface.
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