Kang Seong Min, An Joon Hyung
Department of Mechanical Engineering, Chungnam National University, Daejeon 34134, Korea.
ACS Appl Mater Interfaces. 2022 Aug 31;14(34):39646-39653. doi: 10.1021/acsami.2c12398. Epub 2022 Aug 18.
Directional droplet-sliding control without wetting the surface is immensely required in advanced surface engineering, including biological and chemical analyses or green technology. However, the development of robust and transparent thin sticker-type directional omniphobic films for portable usage in smart microfluidic platforms is rare. In this study, we report a novel perfluoropolyether (PFPE) directional omniphobic film (PDOF). The PDOF is a robust and transparent ultra-thin sticker-type film that can control the anisotropic sliding of various liquid droplets on the surface. The PFPE is a chemically stable and turgid material compared to polydimethylsiloxane (PDMS), which is often used to fabricate liquid-repellent thin films. A well-designed fabrication criterion through adhesion engineering in the soft-molding process was developed using the PFPE to obtain a PDOF with a thickness of 56 μm, with re-entrant micro-stripe structures on the surface. The fabricated PDOF showed intriguing liquid sliding properties based on the direction and spacing of the microstructures. This aspect is defined as an anisotropic factor.
在先进的表面工程领域，包括生物和化学分析或绿色技术，非常需要在不润湿表面的情况下实现定向液滴滑动控制。然而，用于智能微流控平台便携式使用的坚固且透明的薄贴纸型定向超疏液膜却很少见。在本研究中，我们报道了一种新型全氟聚醚（PFPE）定向超疏液膜（PDOF）。PDOF是一种坚固且透明的超薄贴纸型薄膜，能够控制各种液滴在表面的各向异性滑动。与常用于制造拒液薄膜的聚二甲基硅氧烷（PDMS）相比，PFPE是一种化学稳定且坚韧的材料。通过在软模制过程中利用PFPE进行粘附工程，开发了一种精心设计的制造标准，以获得厚度为56μm、表面具有凹入微条纹结构的PDOF。基于微结构的方向和间距，所制备的PDOF表现出有趣的液体滑动特性。这一方面被定义为各向异性因子。
