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液滴冲击疏水面的动态效应和附着:反弹或黏附。

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

机构信息

Key Laboratory of Eco-Textiles of Ministry of Education, College of Textiles and Clothing, Jiangnan University, Wuxi 214122, China.

出版信息

Nanoscale. 2017 Jun 22;9(24):8249-8255. doi: 10.1039/c7nr02906c.

Abstract

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.

摘要

本文采用呼吸图形法研究了水滴冲击扁平、多孔和图钉状结构的星形多面体低聚倍半硅氧烷(POSS)氟代丙烯酸酯、POSS-聚(三氟乙基甲基丙烯酸酯)(POSS-PTFEMA)和 POSS-聚(三氟乙基甲基丙烯酸酯)-b-聚(甲基丙烯酸甲酯)(POSS-PTFEMA-b-PMMA)薄膜的动态效应。通过控制共聚物结构和温度以及表面剥离,可以获得具有不同表面化学成分的多孔和图钉状结构薄膜。测量了不同薄膜的水接触角,并研究了在 45°、90°、135°和 180°翻转时图钉状结构薄膜上的水滴。结果表明,图钉状结构薄膜具有一定的亲水能力。进一步研究了这些薄膜上水滴的冲击行为。考察了水滴的形貌变化、液滴的扩展直径、能量转换、恢复系数和附着力。最后,提出了水滴在静态和动态条件下与图钉状和多孔结构表面接触的示意图。这对于实现各种应用至关重要,如微液滴输送、土壤侵蚀、喷涂、防冰表面和纺织品的防污剂。

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