Applying hot-embossing technology, a simple and cost-effective method for the fabrication of microstructured High Density Polyethylene (HDPE) surfaces with a robust superhydrophobic wetting state is proposed. Micro-meshes and micro-grooves in the flexible template are filled by the PE melt in the hot embossing process. Subsequently, a two-stage microstructure on the PE film surface is formed. This PE film exhibits a contact angle of 151.8° ± 2° and roll-off angle of > 90° when a 5 µL water droplet is dropped on its surface. Water pinning ability on the surface is figured out and roll-off angles are as a quadratic function of specified water droplet volume. Specifically, a 356 µN water pinng force appears on the HDPE film due to the solid-vapor composite interface on its surface. Meanwhile, self-cleaning and immersion tests reveal that the HDPE surface with micro-pillars exhibit robust Cassie impregnating wetting state against external pressure. The proposed method for facial fabrication of microstructured surfaces is an appropriate candidate for the development of droplet manipulation and functional biomimetic polymer surfaces.

中文翻译：

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具有鲁棒超疏水润湿状态的仿生水钉扎微观结构在聚乙烯表面的表面制备

提出了一种应用热压印技术的简单，经济的方法，以制造具有强超疏水润湿状态的微结构高密度聚乙烯（HDPE）表面。PE熔体在热压花过程中填充了柔性模板中的微网孔和微槽。随后，在PE膜表面上形成两阶段的微结构。当5 µL水滴在其表面上时，该PE膜的接触角为151.8°±2°，滚降角> 90°。计算出表面上的水钉扎能力，并且倾角是指定水滴体积的二次函数。具体而言，由于其表面上的固-汽复合界面，HDPE薄膜上出现了356 µN的水钉扎力。与此同时，自清洁和浸入测试显示，带有微柱的HDPE表面表现出坚固的Cassie浸渍状态，可抵抗外部压力。所提出的用于微结构化表面的面部制造的方法是微滴操纵和功能仿生聚合物表面发展的合适候选者。