Lotus effect

How is the lotus effect created?

The lotus leaf under the microscope:

Lotus effect: surface

Looking more closely at the leaf of the lotus flower, one recognizes a wax surface consisting of tiny wax crystals. These wax crystals give the lotus leaf its typical knobbed structure. Dirt particles have only a few contact points with the blade due to this rough surface structure, which prevents the dirt from sticking. Water droplets will bead through the surface texture and take with it all dirt particles.

Lotus effect: The larger the contact angle, the more water-repellent the surface

Lotus effect: surface

The contact angle between the surface of the substrate and the surface of the waterdrop essentially determines the degree of hydrophobicity. A contact angle of 0 degrees means complete wetting, while a contact angle of 180 degrees means complete non-wettability of the surface. Here the drop of water touches the surface in just one point.

When a hydrophobic surface is rough, the contact angle increases as the wettability decreases. The Contact angle on leaf surfaces can reach up to 170 degrees. Such a surface is called superhydrophobic.

Lotus effect: leaf

Provide a low attack surface

The contact surface for water drops is relatively smooth on smooth, hydrophobic surfaces. This means that the water droplets can be distributed over a large area on the surface. However, dirt particles are not removed, the drops of water just slip over the dirt.

Lotus effect: leaf

Nanoproducts counteract exactly this effect. For surfaces that have been treated with a nano-seal, the contact area of ​​the area covered by the water droplet is minimized. There few contact points between the drops and the surface the drop of water assumes a spherical shape and rolls off the coated surface. Dirt particles are taken along by the water droplet and removed.

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Video Board: Mr. Nano Explains the Lotus Effect