Dynamic effects and adhesion of water droplet impact on hydrophobic surfaces: bouncing or sticking

This work reported the dynamic effects of water droplet impact on flat, porous and pincushion structure films of star shaped polyhedral oligomeric silsesquioxane (POSS) fluorinated acrylates, POSS-poly(trifluoroethyl methacrylate) (POSS-(PTFEMA) ) and POSS-(poly(trifluoroethyl methacrylate)-b-poly(m...

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Veröffentlicht in:Nanoscale 2017-06, Vol.9 (24), p.8249-8255
Hauptverfasser: Li, Zhiguang, Kong, Que, Ma, Xiaoyan, Zang, Duyang, Guan, Xinghua, Ren, Xuehong
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container_end_page 8255
container_issue 24
container_start_page 8249
container_title Nanoscale
container_volume 9
creator Li, Zhiguang
Kong, Que
Ma, Xiaoyan
Zang, Duyang
Guan, Xinghua
Ren, Xuehong
description This work reported the dynamic effects of water droplet impact on flat, porous and pincushion structure films of star shaped polyhedral oligomeric silsesquioxane (POSS) fluorinated acrylates, POSS-poly(trifluoroethyl methacrylate) (POSS-(PTFEMA) ) and POSS-(poly(trifluoroethyl methacrylate)-b-poly(methyl methacrylate)) (POSS-(PTFEMA-b-PMMA) ), using the breath figure method. The porous and pincushion structure films with different surface chemical compositions were obtained by controlling the copolymer structure and temperature and by stripping of the surface. The water contact angles on the different films were measured, and the water droplets on the pincushion structure films when reversed at 45°, 90°, 135° and 180° were also studied. It was found that the pincushion structure films revealed a water adhesion ability. Furthermore, the water droplet impact behavior on these films was investigated. The morphology variations of water droplets, spreading diameter of the droplets, energy conversion, restitution coefficient and adhesion force were examined. Finally, the schematic illustration of water droplets under the static and dynamic states in contact with the pincushion and porous structure surfaces was proposed. It is critical to materialize various applications such as microdroplet transportation, soil erosion, spray painting, anti-icing surface and antifouling agents for textiles.
doi_str_mv 10.1039/c7nr02906c
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source Royal Society Of Chemistry Journals 2008-
subjects Adhesion
Contact
Contact angle
Droplets
Dynamics
Nanostructure
Polyhedral oligomeric silsesquioxane
Textiles
title Dynamic effects and adhesion of water droplet impact on hydrophobic surfaces: bouncing or sticking
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