Maro Publications

Surfaces

Notes

From 06/16/2015 through 8/16/2012

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**Notes**

2. “There are varying ways to make coatings that exhibit superhydrophilicity water/air contact angles in which the angles are essentially zero. Superhydrophilic surfaces exhibit perfect wetting when the surfaces are immersed such that essentially no air bubbles will form on such surfaces when the surfaces are immersed. If drops of water are placed on a surface, the drops will immediately flatten out to coat the surface evenly with water. This effect is the exact opposite of superhydrophobicity.

Superhydrophobicity has the requirement of a hydrophobic surface with a special geometry/roughness that forms a very thin layer of trapped air on the surface. This is opposite of what is preferred because air layers are very good sound reflectors/scatterors. Instead, it is preferred to have a superhydrophilic surface in which the water is in intimate contact with the surface so that there are no trapped air bubbles to interfere with the acoustic sensing. To make a superhydrophilic surface, the surface roughness is not critical; but to make a superhydrophobic surface then the correct degree of surface roughness is crucial.”

[Surface Wetting, US Patent 8,518,495 (8/27/2013)]

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1. “In mathematics, specifically in topology, a surface is a two-dimensional topological manifold. The most familiar examples are those that arise as the boundaries of solid objects in ordinary three-dimensional Euclidean space R3 — for example, the surface of a ball. On the other hand, there are surfaces, such as the Klein bottle, that cannot be embedded in three-dimensional Euclidean space without introducing singularities or self-intersections.

To say that a surface is "two-dimensional" means that, about each point, there is a coordinate patch on which a two-dimensional coordinate system is defined. For example, the surface of the Earth is (ideally) a two-dimensional sphere, and latitude and longitude provide two-dimensional coordinates on it (except at the poles and along the 180th meridian).

The concept of surface finds application in physics, engineering, computer graphics, and many other disciplines, primarily in representing the surfaces of physical objects. For example, in analyzing the aerodynamic properties of an airplane, the central consideration is the flow of air along its surface.”

(Wikipedia, Surfaces, 8/16/2012)

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(RDC 6/5/2012)**

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**Roger D. Corneliussen
Editor
www.maropolymeronline.com **

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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

* Date of latest addition; date of first entry is 8/16/2012.