Extreme wettability contrast in hybrid surfaces for enhancing dew collection

This study proposes the investigation of water harvesting on the hybrid surface with different super hydrophilic sizes, which is inspired by the water-capturing behavior of the Stenocara beetle. The combination of water collection (superhydrophilic spots) and water-driven (superhydrophobic area) facilitates the water collection process on such a unique morphology. The results describe the importance of contact angle hysteresis in the determination of collection efficiency. The higher hysteresis difference leads to the larger critical droplet volume and can be explained through the wettability contrast at the boundary. The critical volume calculation of a single droplet has been carried out and demonstrated a good correlation with the condensation mass. This result figures out the appropriate hydrophobic-hydrophilic combination and proposes a model for water collection on a hybrid surface.