Interfacial Tension and Rheology

The dynamic process of adsorption of emulsifiers and the equilibrium state of the interfacial film can be measured by the change in interfacial tension as a function of time. Dynamic interfacial tension techniques exist that measure without disturbing the interface. Various such techniques to measure interfacial tension have been reported in the literature (Addison and Hutchinson, 1949 Padday and Russel, 1960). The Wilhelmy plate technique is preferred over other techniques because the values obtained are more accurate than those obtained using other techniques such as the capillary rise or du Nouy ring methods (Padday and Russel, 1960). In the latter two methods, the long equilibration time (3-60 hours) and difficulties in accurately positioning the 

When an element of area covered with soluble material is subject to surface contraction, some of the material escapes into the bulk phase and returns when the interface is expanded in interfacial dilational rheology (Murray and 

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Ding, R, Racek, A.W., Frith, W.J., et al. 2005. The effect of temperature and composition on the interfacial tension and rheology of separated phases in gelatin/pullulan mixtures. Pood Hydrocolloids 19 567-574. 

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