Characterisation of alkyl amines at the water/air surface with the drop and bubble profile analysis tensiometry.
Pendant drop and buoyant bubble methods have been used to study the surface characteristics of alkyl amines at the water/air surface. The investigated alkyl amines, triethylamine and octylamine, showed unusual changes in the surface tension as a function of time: an initially steep drop and a subsequent steady increase in the surface tension until a value close to the one of the pure water/air system was observed. This phenomenon is explained by the evaporation of the alkyl amines, for which several sets of experiments have been conducted with the pendant drop and buoyant bubble methods. Using an appropriate experimental protocol, the equilibrium adsorption behaviour of the two amines can be quantitatively measured.
Karlsruher Institut für Technologie (KIT), Lebensmittelverfahrenstechnik, Kaiserstr. 12, 76131 Karlsruhe, Germany. marion.winkelmann@kit.edu
Marion
M
Winkelmann
Aliyar
A
Javadi
Reinhard
R
Miller
Heike Petra
HP
Schuchmann