Abstract
This overview paper highlights the role of thin liquid film dynamics in understanding foam structure and stability, and summarizes the recent contributions of the fundamental research performed in our laboratory. The significance of the surface rheological properties such as surface elasticity or surface tension gradient, and surface shear and dilatational viscosities in the hydrodynamics of thin foam films as well as in foam bulk rheological behavior is illustrated. The phenomenon of stratification ( i.e., stepwise thinning) in foam films and a new mechanism for the stabilization of foams due to the formation of long-range, “ordered” micellar structures inside the film, over distances of the order of 100 nm or 1,000Å, are discussed. The stabilizing/destabilizing effects of oil for aqueous foam systems and the importance of the “pseudoemulsion” film in controlling stability in such three-phase foam systems are explained.
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