Definition of Surface Free Energy
- Surface Free Energies is the excess energies at the surfaces of a material compared to the bulk. It quantifies the work required to create a unit area of surface.
- Relationship with Surface Tension: Numerically equal to surface tension in liquids.
Concepts of Surface Free Energy
- Thermodynamics: Surfaces free energy arises because molecules at the surfaces are not completely surrounded by other molecules, leading to higher energy states.
- Minimization: Systems tend to minimize surface free energies, influencing processes like droplet formation.
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Importance
- Wetting and Spreading: Determines how liquids interact with solid surfaces.
- Particle Aggregation: High surface energy particles may aggregate to reduce total surface energy.
Applications
- Tablet Coating: Influences adhesion of coatings.
- Nanoparticle Formulation: Affects stability and dispersion of nanoparticles.
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