Duprd equation

Assessment of wettability from the contact angle. A favourable case is when a contact angle 6 can be measured between the liquid and solid in equilibrium with the vapour, so that the Young-Duprd equation can be applied. As early as 1805, Young considered the possibility of such an equilibrium between surface tensions, but it was only in 1869 that Duprd put it in the well-known form of equation ... 

The simplest way to describe the wetting phenomena that occur when a solid particle is immersed in a liquid is to consider a cube of unit length (Figure 6.2). There are three stages involved, namely adhesion immersion, and spread-ing Using the Young-Duprd equation... 

In the same manner, the thermodynamic work of adhesion between a solid and a liquid, W, in J.m, was originally formulated by A. Dupr in 1869, and is called the Duprd equation ... 

This value is relevant to adhesion through the Young-Duprd equation which relates the surface tension to the free energy of adhesion. 

Combining Young and Duprd s law (Equation 8.3) with Girifalco and Good s approximation (Equation 5.29), allows for a further analysis of y.. Thus,... 

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