Compact nanoscale textures reduce contact time of bouncing droplets

Lin Wang, Ruoxi Wang, Jing Wang, Tak Sing Wong

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Many natural surfaces are capable of rapidly shedding water droplets-a phenomenon that has been attributed to the presence of low solid fraction textures (Φs ~ 0.01). However, recent observations revealed the presence of unusually high solid fraction nanoscale textures (Φs ~ 0.25 to 0.64) on water-repellent insect surfaces, which cannot be explained by existing wetting theories. Here, we show that the contact time of bouncing droplets on high solid fraction surfaces can be reduced by reducing the texture size to ~100 nm. We demonstrated that the texture size-dependent contact time reduction could be attributed to the dominance of line tension on nanotextures and that compact arrangement of nanotextures is essential to withstand the impact pressure of raindrops. Our findings illustrate a potential survival strategy of insects to rapidly shed impacting raindrops, and suggest a previously unidentified design principle to engineering robust water-repellent materials for applications including miniaturized drones.

Original languageEnglish (US)
Article numbereabb2307
JournalScience Advances
Volume6
Issue number29
DOIs
StatePublished - Jul 2020

All Science Journal Classification (ASJC) codes

  • General

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