Ahn Hyunah, Yun Geun-Tae, Ryu Jin, Jang Gyu-Min, Im Sung Gap, Jung Hee-Tae
Department of Chemical and Biomolecular Engineering (BK21 four) Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea.
Functional Thin Film Laboratory (FTFL) Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea.
Small Sci. 2025 Mar 4;5(6):2400631. doi: 10.1002/smsc.202400631. eCollection 2025 Jun.
In nature, the springtail represents an ideal superomniphobic system, exhibiting remarkable resistance to organic liquids in both static and dynamic states. This behavior is attributed to the hierarchical structure of their skin, consists of micro- and nanostructures. While numerous artificial superomniphobic surfaces have been developed to mimic its geometry and properties, previous designs are limited to flat surfaces and failed to incorporate the curvature of the springtail's cuticle. Here, a curved superomniphobic surface is first developed that mimics both the curved shape and hierarchical structure of springtail skin. This system developed on the flexible substrate reveals the significant role that curvature plays in reducing the contact time of low-surface-tension liquid. While the static repellency on curved and flat surfaces is comparable, droplet rebound dynamics are distinctive on curved surfaces, showing asymmetric bouncing that conforms to the curvature. This effect intensifies with increased curvature, leading to a reduction in contact time by up to 54%, a record for organic liquid. This study uncovers the crucial role of surface curvature in springtail superomniphobicity and offers valuable insights for designing advanced omniphobic systems.
在自然界中，跳虫代表了一种理想的超憎液系统，在静态和动态下都对有机液体表现出显著的抗性。这种行为归因于其皮肤的分层结构，该结构由微米和纳米结构组成。虽然已经开发出许多人工超憎液表面来模仿其几何形状和特性，但以前的设计仅限于平面，未能纳入跳虫角质层的曲率。在此，首次开发出一种弯曲的超憎液表面，它模仿了跳虫皮肤的弯曲形状和分层结构。在柔性基板上开发的这个系统揭示了曲率在减少低表面张力液体接触时间方面所起的重要作用。虽然弯曲表面和平坦表面上的静态排斥力相当，但液滴在弯曲表面上的反弹动力学是独特的，呈现出符合曲率的不对称弹跳。随着曲率增加，这种效应会增强，导致接触时间减少多达54%，这是有机液体的记录。这项研究揭示了表面曲率在跳虫超憎液性中的关键作用，并为设计先进的憎液系统提供了有价值的见解。
