Transcription of surface energy finn - ramé-hart Surface Science …
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surface energy finn - ramé-hart Surface Science …
1. The Measurement of Surface energy of polymer by means of contact angles of liquids on solid surfaces A short overview of frequently used methods by finn Knut Hansen Department of Chemistry University of Oslo 2. Definitions Surface tension and Surface energy L F. dx Surface tension form force: The force, F, involved in stretching a film is: F = L = Surface tension (constant). This means: = F/L force/unit length Units: N/m or mN/m (= dyn/cm in units). Surface energy from work: The work, dW, involved in increasing the Surface by a length dx is: dW = dG = L dx = dA. This means: = dG/dA free energy /unit area Units: J/m2 = N/m Surface tension and Surface energy are interchangeable definitions with the same units Work of adhesion and work of cohesion Work of adhesion The work of adhesion between 2 (incompatible).
1 The Measurement of surface energy of polymer by means of contact angles of liquids on solid surfaces A short overview of frequently used methods
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