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Superhydrophobic Surfaces

Notes

From 04/11/2014 to  5/15/2012

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from 5/15/2012

Notes

"Superhydrophobic surfaces such as the leaves of the lotus plant have surfaces that are extremely difficult to wet. The contact angles of a water droplet exceeds 150° and the roll-off angle is less than 10°.This is referred to as the Lotus effect."  (Wikipedia, Superhydrophobic Surfaces, 11/18/2010)

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“Active recent research on superhydrophobic materials might eventually lead to industrial applications. For example, a simple routine of coating cotton fabric with silica or titania particles by sol-gel technique has been reported, which protects the fabric from UV light and makes it superhydrophobic. Also, an efficient routine has been reported for making polyethylene superhydrophobic and thus self-cleaning—99% of dirt adsorbed on such surface is easily washed away. Patterned superhydrophobic surfaces also have the promises for the lab-on-a-chip, microfluidic devices and can drastically improve the surface based bioanalysis.”  (Wikipedia, Hydrophobic Surfaces, 6/2/2011)   

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“Hydrophobic structures are known for their ability to repel high surface tension liquids such as water. Some hydrophobic structures are based on  raised features that are spaced apart by interstices and held in positions relative to each other on a substrate.  These raised features may take the form of various shapes, including posts, blades, spikes, and ridges. When a liquid having a sufficiently high surface tension makes contact with the surface of such a hydrophobic structure, the liquid may form an interface with the surface of the hydrophobic structure at a local contact angle sufficiently high so that the liquid does not immediately penetrate into the interstices. Such a surface is then described as being "superhydrophobic".” [Lyons and Mullins, US Patent 8,047,235 (11/1/2011)]

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“A typical superhydrophobic (ultrahydrophobic) surface can repel water droplets from wetting itself, and the contact angle of a water droplet resting on a superhydrophobic surface is greater than 150°, which means extremely low wettability is achievable on superhydrophobic surfaces. Many superhydrophobic surfaces (both manmade and natural) normally exhibit micro- or nanosized roughness as well as hierarchical structure, which somehow can influence the surface's water repellence. As the research into superhydrophobic surfaces goes deeper and wider, it is becoming more important to both academic fields and industrial applications.”  [Yan, Gao and Bertholot, (80-105) Advances in Colloid and Interface Science 169 #2 (2011)]

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Roger D. Corneliussen
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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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* Date of latest addition; date of first entry is 5/15/2012.