Difference between revisions of "Wetting"
(→Introduction) |
(→Introduction) |
||
| Line 4: | Line 4: | ||
Wetting refers to how well or poorly a liquid contacts a surface. Usually the term applies to water, where if a surface is [[hydrophobic]] it will not wet well while if it is [[hydrophilic]] it will wet well. The relative [[hydrophobicity]] or [[hydrophilicity]] of a substrate can be determined by measuring the [[contact angle]] of water with the surface. A liquid wets a surface better if it has a low [[contact angle]] with that surface. In general, if the contact angle is lower than 90 degrees, the liquid is considered to be wetting for that surface; while, if the contact angle is greater than 90 degrees, the liquid is non-wetting for the surface. | Wetting refers to how well or poorly a liquid contacts a surface. Usually the term applies to water, where if a surface is [[hydrophobic]] it will not wet well while if it is [[hydrophilic]] it will wet well. The relative [[hydrophobicity]] or [[hydrophilicity]] of a substrate can be determined by measuring the [[contact angle]] of water with the surface. A liquid wets a surface better if it has a low [[contact angle]] with that surface. In general, if the contact angle is lower than 90 degrees, the liquid is considered to be wetting for that surface; while, if the contact angle is greater than 90 degrees, the liquid is non-wetting for the surface. | ||
| − | [[Image:wetting.png|thumb|400px| Diagram showing (A) | + | [[Image:wetting.png|thumb|400px| Diagram showing states for a liquid on a surface with (A) little wetting, (B) moderate wetting, and (C) high wetting. (Taken from[http://en.wikipedia.org/wiki/Wetting Wikipedia Article] ]] |
See also: | See also: | ||
Revision as of 15:37, 7 December 2011
Chosen by Grant England
Introduction
Wetting refers to how well or poorly a liquid contacts a surface. Usually the term applies to water, where if a surface is hydrophobic it will not wet well while if it is hydrophilic it will wet well. The relative hydrophobicity or hydrophilicity of a substrate can be determined by measuring the contact angle of water with the surface. A liquid wets a surface better if it has a low contact angle with that surface. In general, if the contact angle is lower than 90 degrees, the liquid is considered to be wetting for that surface; while, if the contact angle is greater than 90 degrees, the liquid is non-wetting for the surface.
See also:
Wetting from Lectures for AP225.
Cassie and Wenzel States
Keyword in references:
Critical Casimir effect in three-dimensional Ising systems: Measurements on binary wetting films
Dewetting-Induced Membrane Formation by Adhesion of Amphiphile-Laden Interface
Encoding complex wettability patterns in chemically functionalized 3D photonic crystals
