SuperHydroPhobic Coating » Hydrophobic Knowledge

Wonderful experiments with superhydrophobic surfaces (video)

SuperHydroPhobicCoating.com — Sat, 14 Mar 2009 19:23:47 +0000

Peter Liu just pointed us to a really interesting video on superhydrophobic surfaces. We hope you will enjoy as much as we did:

The video features Neil Shirtcliffe of test-tube.org.uk

Please feel free to comment and discuss the video below!

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Water droplets bouncing on superhydrophobic surfaces

SuperHydroPhobicCoating.com — Thu, 11 Dec 2008 13:57:57 +0000

What is special on a superhydrophobic surface is that the water droplets bounce and roll-off. This property makes the superhydrophobic surface very attractive for a great number of potential applications. It is actually very interesting to watch how the droplets are bouncing on superhydrophobic surfaces. GE scientists recorded with a high-speed camera a bouncing droplet on a superhydrophobic surface.

Watch it at: http://www.grcblog.com/?p=364

Of course the bouncing of a droplet on a surface is not as simple as it looks. There is a great number of parameters that determines how a droplet can impact on a superhydrophobic surface; drop size and impact velocity are examined in a new published study. The theoretical study of the impact of a water droplet on superhydrophobic surface is presented at: http://pubs.acs.org/doi/full/10.1021/la802897g

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Hydrophilic vs. hydrophobic. The meaning of contact angle

SuperHydroPhobicCoating.com — Tue, 15 Jul 2008 00:03:10 +0000

Hydrophilicity, comes from the Greek ύδωρ, (water) and φιλία (friendship). It refers to a physical property of a material that can transiently bond with water (H₂O) through hydrogen bonding.

A hydrophilic material is a friend of water. Friends like to come closer, so a water droplet would spread on a hydrophilic surface. Furthermore water can enter the pores of a hydrophilic material and totally wet it. Most natural materials are hydrophilic.

The evaluation of hydrophilicity is made through water contact angle measurements. A water droplet would occupy as long surface of the hydrophilic material as possible. So the water contact angle will be significantly low.

Hydrophobicity comes also from the Greek ύδωρ, (water) and φόβος (fear). It refers to the physical property of a material (known as a hydrophobic) that repels a mass of water.

Water would be afraid of a hydrophobic material. So a water droplet would try not to touch large area of the surface and the shape of the droplet would be spherical. Hydrophobic natural materials are waxes, oils and fats.

The evaluation of hydrophobicity is made through water contact angle measurements. A water droplet would be spherical so the water contact angle will be significantly high.

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