Abstract
The temperature dependence of interfacial tension in oil—surfactant—water systems was investigated to evaluate the adsorption of surfactants under superheated conditions; the adsorption under such conditions is necessary in order to provide fundamental information for discussing the superheat limit of W/O emulsions. As surfactants, Span 80 and NPE x ( x = 2, 5, and 7.5) were used. The interfacial tension was measured by the Wilhelmy method in the temperature range from 301 to 355 K. The saturation adsorption obtained from the interfacial tension data for the kerosene—water system is almost independent of temperature, while that for the n-tetradecane—water system decreases slightly with increasing temperature. The adsorption equilibrium constant is correlated as a function of temperature which contains the free energy of adsorption. From these constants, the adsorption of the surfactants under superheated conditions can be predicted.
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