Biomimic Low Hysteresis Surface Prepared by Hierarchical Micro/Nano Textures

Abstract

In this work, a low hysteresis surface prepared by hierarchical textures for the reduction of liquid droplet adhesion is proposed. This surface is important to provide a platform for droplet-based biological reactions with minimum surface interferences. The hierarchical textures, mimicking lotus leaf surface, were composed of two length scales (nano-/micro-textures). Hereby, a high contact angle (160°) and low hysteresis (~2.7°) was obtained and comparable to the surface properties of lotus leaf. In dynamic contact angle analysis by droplet impinging onto the surface, multi-metastable states were categorized and showed a high correlation to the multilength scale that would be noticeable for contact angle control.