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From ExtremeTech:
A team of nanomaterial
scientists and mechanical engineers at MIT have created a
superhydrophobic material that is 10,000 times more slippery than
existing hydrophobic surface. This could seriously boost the efficiency
of fossil fuel power plants, and many other technologies that include
cooling towers, such as desalination plants.
Hydrophobic, as you
have probably guessed, literally means "water fear." There are
hydrophobic substances that resolutely refuse to mix with water (such as
oils and fats), and hydrophobic materials and coatings that prevent
water from pooling on its surface. In scientific terms, hybrophobicity
is caused by surfaces that disrupt the hydrogen bonding in water. So as
to minimize the disruption to its molecular makeup, the water droplet
pushes itself away from the surface to minimize its contact area,
becoming a very tight droplet.
It is very easy to identify a
hydrophobic material because water forms into droplets that rapidly roll
around - such as on your car windshield, or on a freshly waxed
hood/roof. The more hydrophobic the material, the stronger this effect
is, until the water effectively floats or skims across the surface with
very low friction.
Read the whole article
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