Facial Fabrication of Biomimetic Water Pinning Microstructures on Polyethylene Surfaces with Robust Superhydrophobic Wetting State  

作　　者：Yuzhu Li Hang Gao Yunhai Ma Donghui Chen 

机构地区：[1]School of Mechatronics Engineering,Shenyang Aerospace University,Shenyang 110136,China [2]Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang 110136,China [3]Key Laboratory for Bionic Engineering,Ministry of Education,Jilin University,Changchun 130022,China

出　　处：《Journal of Bionic Engineering》2020年第4期644-651,共8页仿生工程学报（英文版）

基　　金：the Nature Science Foundation of China(Grant No.51475205);Research Foundation for Introduced Talents of Shenyang Aerospace University(502/120419030 and 502/120419031)。

摘　　要：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-offangle of>90~when a 5μL 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 356μN 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 ofmicrostructured surfaces is an appropriate candidate for the development of droplet manipulation and functional biomimetic polymer surfaces.

关 键 词：water pinning hot-embossing Cassie impregnating SELF-CLEANING microstructure 

分 类 号：Q81[生物学—生物工程]