Cargando…
Compact nanoscale textures reduce contact time of bouncing droplets
Many natural surfaces are capable of rapidly shedding water droplets—a phenomenon that has been attributed to the presence of low solid fraction textures (Φ(s) ~ 0.01). However, recent observations revealed the presence of unusually high solid fraction nanoscale textures (Φ(s) ~ 0.25 to 0.64) on wat...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7439615/ https://www.ncbi.nlm.nih.gov/pubmed/32832639 http://dx.doi.org/10.1126/sciadv.abb2307 |
_version_ | 1783573014637445120 |
---|---|
author | Wang, Lin Wang, Ruoxi Wang, Jing Wong, Tak-Sing |
author_facet | Wang, Lin Wang, Ruoxi Wang, Jing Wong, Tak-Sing |
author_sort | Wang, Lin |
collection | PubMed |
description | Many natural surfaces are capable of rapidly shedding water droplets—a phenomenon that has been attributed to the presence of low solid fraction textures (Φ(s) ~ 0.01). However, recent observations revealed the presence of unusually high solid fraction nanoscale textures (Φ(s) ~ 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. |
format | Online Article Text |
id | pubmed-7439615 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-74396152020-08-20 Compact nanoscale textures reduce contact time of bouncing droplets Wang, Lin Wang, Ruoxi Wang, Jing Wong, Tak-Sing Sci Adv Research Articles Many natural surfaces are capable of rapidly shedding water droplets—a phenomenon that has been attributed to the presence of low solid fraction textures (Φ(s) ~ 0.01). However, recent observations revealed the presence of unusually high solid fraction nanoscale textures (Φ(s) ~ 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. American Association for the Advancement of Science 2020-07-17 /pmc/articles/PMC7439615/ /pubmed/32832639 http://dx.doi.org/10.1126/sciadv.abb2307 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/ https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Wang, Lin Wang, Ruoxi Wang, Jing Wong, Tak-Sing Compact nanoscale textures reduce contact time of bouncing droplets |
title | Compact nanoscale textures reduce contact time of bouncing droplets |
title_full | Compact nanoscale textures reduce contact time of bouncing droplets |
title_fullStr | Compact nanoscale textures reduce contact time of bouncing droplets |
title_full_unstemmed | Compact nanoscale textures reduce contact time of bouncing droplets |
title_short | Compact nanoscale textures reduce contact time of bouncing droplets |
title_sort | compact nanoscale textures reduce contact time of bouncing droplets |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7439615/ https://www.ncbi.nlm.nih.gov/pubmed/32832639 http://dx.doi.org/10.1126/sciadv.abb2307 |
work_keys_str_mv | AT wanglin compactnanoscaletexturesreducecontacttimeofbouncingdroplets AT wangruoxi compactnanoscaletexturesreducecontacttimeofbouncingdroplets AT wangjing compactnanoscaletexturesreducecontacttimeofbouncingdroplets AT wongtaksing compactnanoscaletexturesreducecontacttimeofbouncingdroplets |