Question

what is ultrahydrophobic material?
and what is lotus effect?

Answer 1

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ULTRAHYDROPHOBIC MATERIAL:
A special family of nano-powders was developed, capable of forming surfaces with exceptional super-hydrophobic (or ultra-hydrophobic) properties. This effect is characterized by the formation of spherical droplets of water on the surface, without any wettabillity...

LOTUS EFFECT:
The lotus effect refers to self-cleaning properties that are a result of ultrahydrophobicity as exhibited by the leaves of Nelumbo or "lotus flower". Dirt particles are picked up by water droplets due to the micro- and nanoscopic architecture on the surface, which minimizes the droplet's adhesion to that surface...

Answer 2

ᴀɴsᴡᴇʀ:

The lotus effect refers to self-cleaning properties that are a result of ultrahydrophobicity as exhibited by the leaves of Nelumbo or "lotus flower". Dirt particles are picked up by water droplets due to the micro- and nanoscopic architecture on the surface, which minimizes the droplet's adhesion to that surface.