An Interlayer of Multiple Microscale Hollow Channels Enhances the Durability of Surface Topographies

Self-cleaning plays a significant role for natural beings, as it keeps surfaces dry and clean, which is beneficial for lowering the body's weight, absorbing more light, and preventing rotting. Various topographies have been created by nature to achieve these goals. The stability of surface topography is the most essential element for maintaining these functions. Here, we report a new method for lowering the elastic modulus and enhancing the durability of surface topography. In this study, we find that multi micro hollow channels interlayer of Lycorma Delicatula's wing could effectively transfer the stress from the upper surface to the interlayer and decrease the stress concentration on the surface nano-topography, which enhances the durability of its surface functions. The simulation and artificial surface illustrate that this new design method provides a new way to decrease the elastic modulus and enhance topographic stability.