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

Abstract

This work reported the dynamic effects of water droplet impacts on flat, porous and pincushion structure films of star shaped polyhedral oligomeric silsesquioxane (POSS) fluorinated acrylates POSS-poly(trifluoroethyl methacrylate)8 (POSS-(PTFEMA)8) and POSS-(poly(trifluoroethyl methacrylate)-b-poly(methyl methacrylate))8 (POSS-(PTFEMA-b-PMMA)8) through breath figure method. The porous and pincushion structure films with different surface chemical compositions were obtained by controlling the copolymer structure, temperature and 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 behaviors on these films were 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 of static and dynamic states on the pincushion and porous structure surfaces were proposed. It is critical to materialize various applications such as microdroplet transportation, soil erosion, spray painting, anti-icing surface and antifouling agents for textiles.

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Publication details

The article was received on 24 Apr 2017, accepted on 16 May 2017 and first published on 17 May 2017


Article type: Paper
DOI: 10.1039/C7NR02906C
Citation: Nanoscale, 2017, Accepted Manuscript
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    Dynamic effects and adhesion of water droplet impacts on hydrophobic surfaces: bouncing or sticking

    Z. Li, Q. Kong, X. Ma, D. Zang, X. Guan and X. Ren, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02906C

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