CALCULATION OF THE ELASTICITY OF FLUID BOUNDARY PHASES WITH THE OSCILLATING BUBBLE METHOD

A survey is given presenting the method of the oscillating bubble. This method provides the opportunity to measure the dilational elasticity of a surface for medium rates of surface area changes of dilation. The results obtained with three surfactant solutions show good agreement with the theory. The critical domain of the measurements, i.e., the dependence of the effective surface elasticity on the frequency, is discussed. The greatest deviations from the theory occur at high concentrations. Here, the establishment of equilibrium between surface and subsurface is obviously retarded. © 1993 Academic Press, Inc.