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Surface energy
Surface energy, also designated surface tension, is a value characterizing the interaction of a condensed phase’s (solid or liquid) surface with its environment, given in mN/m. Surface energy is a criterion for the coatability of a material and can be increased by different plasma processes (e. g. plasma cleaning, plasma etching, etc.).The surface energies of solids range from below 20 mN/m (e. g. PTFE) up to several thousand mN/m (metals, diamond).The surface energy of a solid can be estimated by means of test inks, a precise determination of disperse and polar portion is feasible by wetting angle determination of different liquids on the respective surface.
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