Pressure on Wetting Perimeter and Deformation of Soft Solids

8 PRESSURE ON WETTING PERIMETER AND DEFORMATION OF SOFT SOLIDS 

Within the framework of the model of an absolutely rigid substrate, the vertical component of those forces can be ignored, as its action does not lead to 

FIGURE 2.30 E rofile of transition zone h(x) between bnlk liquid and flat wetting film (1), disjoining pressure isotherms Il(/i) (2,3), and profile of normal forces acting on substrate (Equation 2.131) in the case when a model disjoining pressure isotherm (2) is adopted %y is the position where the vertical force is exerted. 

Our subsequent analysis of the problem of pressure on a wetting perimeter is performed within the framework of the theory, which as previously mentioned, includes a simultaneous action of the capillary and disjoining pressure in the liquid layers presented in the previous sections of this chapter. It was shown in Section 2.3 that the equilibrium contact angle, 0, can be expressed via the disjoining pressure isotherm, TlQi), by Equation 2.47. 

The resultant forces in the vertical direction caused by the pressure on the solid substrate, 

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