Surface free energy can be considered as the surface tension of a solid. Surface free energy is calculated through the contact angle measurements. By knowing the surface free energy of the solid, one can predict the behavior of any liquid on the surface.
Wilhelmy plate method can be used to measure contact angle.
OWRK is one of the most used surface free energy theories. It divides the interfacial interactions into two parts; polar and dispersive.
Demulsification is a process where emulsions are broken down, most typically by the addition of chemicals.
Emulsions are dispersed systems of two immiscible liquids such as oil and water. Interfacial rheology measurements predict emulsion stability.
Interfacial rheology studies the flow properties of the interfacial layer that is formed between two immiscible fluids, such as oil and water.
The good lubricity is needed as the poorly lubricated catheters can cause trauma as a result of high frictional forces between the biomaterial and tissue.
Plasma treatment is able to increase the wettability of most polymers. Hydrophobic recovery is often encountered which causes wettability to decrease.
To better describe the real surfaces, different wetting states have been proposed. The most discussed are Wenzel state and Cassie-Baxter state.
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