Energy immersional wetting

In immersional wetting, the solid, which is not originally in contact with the liquid, is immersed completely in the liquid. The area of liquid-gas interface, therefore, remains unchanged. The free energy change for immersion of a solid in a liquid is given by... 

Suppose that the solid is originally not in contact with water but is immersed completely (i.e., immersional wetting). In this case, the water penetrates the capillaries in the solid. The energy change for immersional wetting, called the adhesion tension, is given by ... 

Immersional wetting corresponds to a process where a solid—vacuum or solid-vapor interface is replaced by a soHd—liquid one. When starting from a solid-vacuum interface, the free energy variation during the process is (per unit area)... 

A third type of wetting is immersional wetting, where a substrate not previously in contact with a liquid is immersed completely by the liquid (Figure 6-5). In this case, the surface free energy change per unit area is... 

Energy of Immersional Wetting See Work of Immersional Wetting. Energy of Separation See Work of Separation. 

When a solid (which originally is not in contact with a liquid) is completely immersed in a liquid, then the liquid-gas interface remains unchanged. This happens, for example, for powders immersed in liquids. For this process, which is often called immersional wetting, we define the work of immersion Wi ) as the difference between the initial and the final energy of the system. Show that the work of immersion is related to the spreading coefficient via the equation ... 

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