Difference between revisions of "Wetting"

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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]]
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[[Image:wetting.png|thumb|400px| Diagram showing (A) perfectly wetting, (B) wetting, and (C) nonwetting states for a liquid on a surface.  (Taken from[http://en.wikipedia.org/wiki/Wetting Wikipedia Article] ]]
  
 
See also:
 
See also:

Revision as of 15:36, 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.

Diagram showing (A) perfectly wetting, (B) wetting, and (C) nonwetting states for a liquid on a surface. (Taken fromWikipedia Article

See also:

Wetting from Lectures for AP225.

Wikipedia Article

Cassie and Wenzel States

Keyword in references:

Controlled switching of the wetting behavior of biomimetic surfaces with hydrogel-supported nanostructures

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

Pitcher plant inspired non-stick surface