ABSTRACT
Elucidation of the role of the foam film type on foam stability is not a trivial task. The reason is that foam is a three-dimensional system of interrelated films and Plateau borders and the two principal processes in foams are related in a very specific way. As capillary pressure rises, the work required to rupture the film decreases. At a significantly high capillary pressure, this work may become so small that mechanical disturbances or even thermal fluctuations may rupture the film. The corresponding method for foams is the Foam Pressure Drop Technique (FPDT) where the capillary pressure in the foam can be regulated thus making foam study conditions very close to thin liquid film–pressure balance technique (TLF-PBT) regarding capillary pressure, film size, and thickness. Combining the use of the FPDT and the TLF-PBT, it is possible to establish quantitative correlations between the properties of isolated microscopic foam films and macroscopic foams.
