~ 4 min

What is surface free energy?

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.

> 5 min

Wilhelmy plate method for contact angle measurement

Wilhelmy plate method can be used to measure contact angle.

> 5 min

OWRK method – Owens, Wendt, Rabel and Kaelble model

OWRK is one of the most used surface free energy theories. It divides the interfacial interactions into two parts; polar and dispersive.

> 3 min

Demulsification of oil-water emulsions

Demulsification is a process where emulsions are broken down, most typically by the addition of chemicals.

> 3 min

How emulsions form and break?

Emulsions are dispersed systems of two immiscible liquids such as oil and water. Interfacial rheology measurements predict emulsion stability.

> 3 min

Evaluation of emulsion stability by interfacial rheology measurements

Interfacial rheology studies the flow properties of the interfacial layer that is formed between two immiscible fluids, such as oil and water.

< 3 min

Urinary catheters – hydrophilic coatings for better lubricity

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.

> 3 min

Plasma treatment and hydrophobic recovery of polymers

Plasma treatment is able to increase the wettability of most polymers. Hydrophobic recovery is often encountered which causes wettability to decrease. 

< 4 min

Cassie – Baxter equation – Extreme wettability on surfaces

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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