| 초록 |
In recent decades, surfaces with repelling liquids are required for many applications. Then many groups tried to make super-hydrophobic surfaces by roughening materials. Nowadays, however, necessity of omniphobic field rises for advanced self-cleaning, anti-fingerprinting, anti-biofouling issues. Omniphobic surfaces include both hydrophobic and oleophobic properties. In particular, animal called springtail inspire many researchers with its intrinsic omniphobic skin. So, some reports study about the skin structure for revealing its origin. They observed the surface was composed of micro-scale roughness with overhang-like nanostructure. The dual-scale surface had not only natural omniphobicity, but high stability upon pressure. However, analytical details about this system are still challenging because this kind of dual-scale system was not fabricated yet and hard to control. In this work, we fabricated dual-scale system with wrinkle as micro-scale roughness and nanostructure with high tunability. Density of wrinkles and shapes of nanostructure were tunable by controlling strain and fabrication of disk, overhang, and serif-T. Serif-T structure was well known as the best structure for omniphobic performance geometrically. We confirmed both micro-scale and nano-scale were highly related with omniphobic performance from ethanol wetting. Our dual-scale system showed some synergetic effect to performance. As further study, analysis and robustness test upon pressure may indicate our system as new candidate for designing next-generation omniphobic surface. |
