| 초록 |
Non-wetting states with high durability in dynamic and underwater conditions are desirable for practical applications in various fields. Despite increasing demands for dual stability of non-wetting surfaces, studies investigating both the impact dynamics and underwater stability are very rare. In this study, we performed water droplet impact dynamics and underwater stability studies using ZnO/Si hierarchical nanostructures. The effects of the surface structure on the non-wetting states in dynamic conditions were first studied by comparing various surface structures. The transition of wetting states occurs on ZnO/Si HNs as the impact velocity increases. Measurement of the critical We number during transition enables us to determine the parameters of wetting pressure using a simple model. Moreover, compared to other structures exhibit increased air pocket life-times in underwater conditions. Our study indicates that optimally designed hierarchical surfaces have remarkably high durability non-wetting states in both dynamic and underwater conditions, expanding the potential application of non-wetting surfaces. |
