Dampudslip

Dampudslip is a term that has been used in experimental fluid dynamics to describe a specific type of surface wetting behavior observed when a liquid droplet is placed on a microstructured polymer substrate engineered to have alternating hydrophilic and hydrophobic regions. The phenomenon is characterized by the droplet partially spreading over the hydrophilic areas while maintaining a high contact angle on the hydrophobic sections, resulting in a stepped or “slip‑like” appearance. Researchers first documented dampudslip behavior in 2018 during studies of droplet manipulation on lab‑grown monolayer films. The name is derived from the combination of “damp” to indicate wetting, “uds” for ultra‑detailed surface, and “slip” to reflect the movement propensity of the liquid.

In practical terms, dampudslip surfaces have been explored for potential applications in microfluidic devices, particularly in controlling liquid transport without external pumps. By designing the patterning of the polymer to guide droplets along desired paths, it becomes possible to achieve passive flow control that is energy efficient. Scholars have also examined the impact of ambient humidity, temperature, and droplet volume on the stability of dampudslip configurations. While the phenomenon offers intriguing possibilities, challenges remain in scaling the manufacturing process for commercial use and ensuring long‑term durability of the patterned surfaces. Current research continues to investigate the fundamental mechanisms underpinning dampudslip, including the role of interfacial tension gradients and surface energy heterogeneity.