Abstract
Contact angle hysteresis (CAH) is essential to characterize the wetting properties of a surface. But its underlying causes are not yet understood. A model relating to CAH is presented through mathematical deduction. The calculation results coincide well with several experimental data from previous findings in literatures. Factors affecting CAH are investigated. This study offers new insight into the understanding of CAH and offers useful guidance for the preparation of superhydrophobic surfaces.
Highlights
Wetting is a fundamental property of material surfaces
It is highly important to investigate the dynamic wetting of droplets on solid surfaces, to learn the formation mechanism and influencing factors of contact angle hysteresis (CAH) during droplet motion, but studies in this area are relatively rare
Contact angle hysteresis (CAH) is often used to predict the dynamics of water droplets on superhydrophobic surfaces,1 which is the difference between θa and θr
Summary
Wetting is a fundamental property of material surfaces. Inspired by the water repellent materials in nature, a variety of artificial superhydrophobic surfaces with excellent performance have been fabricated. Most reported studies focus on the various preparation methods but theoretical research tends to move along at a slow pace. Wenzel model and Cassie models were proposed respectively to predict the static contact angle of rough and heterogeneous surfaces as a revision of Young equation.. The three classical models are restricted to the static characteristics such as water contact angle of surface wetting, which is not sufficient to explain wetting dynamics.. It is highly important to investigate the dynamic wetting of droplets on solid surfaces, to learn the formation mechanism and influencing factors of contact angle hysteresis (CAH) during droplet motion, but studies in this area are relatively rare. Contact angle hysteresis (CAH) is often used to predict the dynamics of water droplets on superhydrophobic surfaces, which is the difference between θa and θr. This work presents a new model for CAH of superhydrophobic surface to study the influence of surface microstructures and intrinsic contact angle on CAH. This study offers new insight into the understanding of CAH and offers useful guidance for the preparation of superhydrophobic surfaces
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