nonwet

Nonwet is a term used to describe a surface that repels liquids, preventing them from spreading and adhering to it. This property is often referred to as hydrophobicity when referring to water repellency, or oleophobicity for oil repellency. Surfaces exhibiting nonwet properties are characterized by a high contact angle between a liquid droplet and the surface. The higher the contact angle, the more the liquid beads up and the less it spreads.

This behavior is a result of the surface's chemical composition and its physical microstructure. Generally, nonwet surfaces have low surface energy. Materials like certain polymers, waxes, and specially treated metals can exhibit nonwet properties. Microscopic or nanoscopic structures on the surface can also enhance nonwetness by trapping air, creating a cushion between the liquid and the solid.

Nonwet surfaces have numerous practical applications. They are utilized in self-cleaning windows, stain-resistant fabrics, anti-fogging coatings for glasses and mirrors, and in microfluidic devices where precise liquid control is essential. The development of effective nonwet surfaces is an active area of research in materials science and engineering, aiming to create more durable, efficient, and versatile repellent technologies.