Unwettable

Describes a substance or surface that resists being wetted or readily penetrated by a liquid, typically water. This property arises from the surface tension of the liquid being greater than the adhesive forces between the liquid and the solid. Consequently, droplets tend to bead up rather than spread out, and the liquid may not effectively coat or absorb into the material. This characteristic often relates to the surface's chemical composition and morphology, influencing its interaction with liquids. Such materials are often hydrophobic (water-repelling) but can also be oleophobic (oil-repelling) or more broadly, resistant to various liquids.

Unwettable meaning with examples

• The lotus leaf's intricate surface structure creates an unwettable surface, causing raindrops to roll off and carry away dirt and debris. This natural self-cleaning mechanism has inspired the creation of unwettable paints and coatings. The unwettable nature means liquid does not stick to it allowing dirt and debris to just fall off, keeping it clean.
• Researchers are developing unwettable textiles that repel spills and stains, offering improved durability and ease of care. These fabrics are designed to create a barrier between the fabric and the liquid, making them unwettable and thus highly desirable for clothing. This would be especially great for children and the clumsy among us.
• Specialized laboratory equipment is designed with unwettable materials to prevent the absorption of liquids and ensure accurate measurements. In scientific experiments it is critical to measure the exact amounts of substances without contamination. These materials stop these things from happening, making sure the data is accurate.
• In firefighting, certain foams are used to make surfaces unwettable and prevent the spread of liquid fuel fires. This strategy relies on creating a barrier between the fuel and the water, limiting the area the fire could spread to, and, thus, putting out the blaze.