Measurements of Contact Angles at Liquid-Solid Interfaces

4 Measurements of Contact Angles at Liquid-Solid Interfaces 

Contact Angles, 0, of Water on Different Solid Surfaces (25°C) Solid 0 

FIGURE1.45 Analysis of contact angle of a liquid drop on a rough solid surface. 

Some Typical Ycr Values for Solid Surfaces (Estimated from Zisman Plots) 

In spite of its basic assumptions, Young s equation has been found to give useful analyses in a variety of systems. For example, a typical data of cos(0) versus various liquids on teflon gave an almost straight line plot. The data can be analyzed by the following relation  

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