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M. S. Kim(김민수),S. H. Yoo(유승훈),G. H. Kim(김건휘),M. K. Kwak(곽문규) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
The leaves of Salvinia Molesta have unique structural and chemical properties. Because of these characteristics, the Salvinia surface can minimize the contact area of the water-air interface while maintaining a stable air layer in the water, which is called the Salvinia effect. Since the Salvinia effect is suitable for application to reduction of hydrodynamic drag, studies have been conducted to imitate the structural and chemical properties of Salvinia. However, due to the complexity of the structure, it was only possible to make the Salvinia-like structures through 3D printing technology, which has clear limitations in productivity. In this study, the hierarchical micropillar array replicated by conventional soft lithography was made to deform similarly to the hair of Salvinia Molesta by introducing capillary force to prepare uniformly clustered pillars. Thereafter, the structural and chemical properties of Salvinia could be imitated through additional hydrophobic and hydrophilic coatings. Since the proposed fabrication technique uses the conventional imprinting methods, it can also be applied to continuous mass production systems. In addition, a significant drag reduction on the Salvinia-inspired surfaces by measuring the effective slip length using a rotational rheometer.