RHEOLOGICAL PROPERTIES OF FATTY-ACID SOLUTIONS AT THE AIR WATER INTERFACE/

In this paper, some rheological properties of fatty acid solutions at the air-water interface were studied by deformation of the equilibrium state of the solutions in the Langmuir trough in various ways. Four k inds of experiments were carried out with the same experimental setup. One of these four methods, the dilational experimental method (Pi-exp erimental method), has been mainly applied in this work and an accompa nying theoretical model was developed. In the new model, we used a for mal application for investigating the mechanisms of the sorption kinet ics during the deformation of the surface under constant surface press ure by an integral equation. The new model involves two main effects: (i) the complicated flux behavior and (ii) the kinetics. The model was applied for describing the surface behavior of the decanoic acid solu tions, and the agreement of the experimental results with the model is satisfactory. In particular, the comparison of the model with other s tandard models is instructive. The other three methods are used as com plementary methods in this work. (C) 1996 Academic Press, Inc.