NewsCompact nanoscale textures reduce contact time of bouncing
droplets

28th July 2020by admin0
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Many natural surfaces can rapidly shed water droplets
due to their water-repellent functionality. In 1945, scientists
Cassie and Baxter linked the water-repellent function of natural
surfaces to their surface textures. The use of low solid fraction
textures (denoted Φs) is therefore a key principle to design
water-repellent surfaces. In this work, Lin Wang and a team of
scientists in materials science, biomedical engineering and
mechanical engineering at the Pennsylvania State University, U.S.
reduced the contact time of bouncing droplets on high solid
fraction surfaces (i.e. Φs ~ 0.25 to 0.65) by reducing the surface
texture size to the nanoscale. They showed how high solid fraction
surfaces with a texture size below 100 nanometers could reduce the
contact time of bouncing droplets by approximately 2.6 milliseconds
(ms) compared to a texture size above 300 nm. The texture and
size-dependent contact time reduction observed on solid surfaces is
a first-in-study outcome relative to existing theories on surface
wettability. Wang et al. credited the reduction in droplet contact
on nanoscale surfaces to the dominant three-phase contact line
tension. Based on pressure stability experiments, the team further
showed how surface solid fractions were bioinspired by insects that
can withstand the impact of raindrops. The results are now
published on Science Advances.

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