Contact Line and Adhesion Force of Droplets on Concentric Ring-Textured Hydrophobic Surfaces

Langmuir : the ACS Journal of Surfaces and Colloids
Donghui WangJaroslaw W Drelich

Abstract

Advances made in fabrication of patterned surfaces with well-defined dimensions of topographic features and their lateral dissemination drive the progress in interpretation of liquid spreading, adhesion, and retreat on engineered solid surfaces. Despite extensive studies on liquid droplet spreading and adhesion on textured surfaces in recent years, conformation of the three-phase contact line and its effect on macroscopic contact angle and droplet adhesion remain the focus of intensive debate. Here, we investigate the effect of surface topography on the adhesion force of Cassie-Baxter-state droplets on concentric ring-textured hydrophobic surfaces having rings with lateral dimensions of 5, 10, and 45 μm and separated by 5, 6, and 7 μm trenches, respectively, with fixed depth of 15 μm. Unlike mostly tested surfaces textured with straight ridges, pores, and pillars, where the droplet base contact line is anisotropic and its conformation varies along the apparent boundary, concentric rings are symmetrical and reinforce the microscopic contact line to align to a circular one that reflects the shape of the pattern. In this study, adhesion forces were calculated based on surface tension and Laplace pressure forces and were compared w...Continue Reading

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Citations

Feb 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Zhanglei ZhuJaroslaw W Drelich
Nov 17, 2020·Physical Review Letters·Youhua JiangChang-Hwan Choi
Jul 3, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Jiaqian LiLiqiu Wang
Jul 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Xiaoyi HuThomas Cubaud

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