Abstract
The surface tension and the dispersion and polar components of the surface tension for fatty acids, fatty alcohols, and triglycerides were estimated by contact angle mea surements in order to apply these concepts to a detergency study. An extended Fowkes' equation was adopted for the calculation. γL of liquid oils (fatty acids, C4-Cs; fatty alcohols, C4-C11) at 293 K decreases slightly with increasing chain length. The contribution of γLd to γL is 90% or more. γS of fat oils (fatty acids, C12-C 18; fatty alcohols, C14-C18, triglycerides, C 12-C18) at 293 K increases with small carbon chain length and decreases when the carbon chain length increases. Triglyceride is the lowest surface energy solid among these three kinds of fats. γ S of decanoic acid, 1-dodecanol and 1-tetradecanol at 283 K (solid state), is larger than γL of the same materials at 313 K (liquid state).
Published Version
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