Kim, Hyunchul Han, Heetak Lee, Sanggeun Woo, Janghoon Seo, Jungmok Lee, Taeyoon 2024-01-19T21:00:38Z 2024-01-19T21:00:38Z 2022-01-25 2019-02 1944-8244 https://pubs.kist.re.kr/handle/201004/120387 Superomniphobic surfaces showing extremely liquid-repellent properties have received a great amount of attention as they can be used in various industrial and biomedical applications. However, so far, the fabrication processes of these materials mostly have involved the coating of perfluorocarbons onto micro- and nanohierarchical structures of these surfaces, which inevitably causes environmental pollution, leading to health concerns. Herein, we developed a facile method to obtain flexible superomniphobic surfaces without perfluorocarbon coatings that have shape-tunable mushroom-like micropillars (MPs). Inspired by the unique structures on the skin of springtails, we fabricated mushroom-like structures with downward facing edges (i.e., a doubly re-entrant structure) on a surface. The flexible MP structures were fabricated using a conventional micromolding technique, and the shapes of the mushroom caps were made highly tunable via the deposition of a thin aluminum (AI) layer. Due to the compressive residual stress of the Al, the mushroom caps were observed to bend toward the polymer upon forming doubly re-entrant-MP structures. The obtained surface was found to repel most low-surface-tension liquids such as oils, alcohols, and even fluorinated solvents. The developed flexible superomniphobic surface showed liquid repellency even upon mechanical stretching and after surface energy modification. We envision that the developed superomniphobic surface with high flexibility and wetting resistance after surface energy modification will be used in a wide range of applications such as self-cleaning clothes and gloves. English American Chemical Society Nonfluorinated Superomniphobic Surfaces through Shape-Tunable Mushroom-like Polymeric Micropillar Arrays Article 10.1021/acsami.8b17181 1 ACS Applied Materials & Interfaces, v.11, no.5, pp.5484 - 5491 ACS Applied Materials & Interfaces 11 5 5484 5491 N scie scopus 000458347900084 2-s2.0-85060641377 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article TRANSPARENT superomniphobic nonfluorinated surface doubly re-entrant structure micropillar springtail