Free surface energy

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Free Surface Energy, Surface Free Energy (SFE) - the size that characterizes the surface properties used in the technique.

Free surface energy is equal to the work needed to create a unit area when separating two equilibrium phases in a reversible isothermal process. The unit of free surface energy is mJ / m (millimeter per square meter).

The value of free surface energy is derived from the measured contact angles by the various measuring fluids.

Methods for determining free surface energy:

Using the first method, you can calculate the total free surface energy using one-liquid measurements. It is enough to determine the contact angles for two measuring fluids (free surface energy is the sum of the two components: D-dispersion and P-polar), whereas for method 4 it is necessary to determine the free surface energy for the methods in points 2. 3. and 4. Determine the contact angles for three measuring fluids (free surface energy is the sum of two components: LW - related to long-range effects: dispersion, polar and inductive, and AB - acid-base interaction).

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