Vapor Pressure Studies of Solubilization
Classical types of physical measurements involving pressure and volume have provided substantial contributions to our understanding of solubilization. King (Chapter 2 in this volume) has provided a very good historical summary of pioneering efforts which have involved pressure or related activity measurements to determine the solubilization of volatile compounds in surfactant micelles. The focus of this chapter is on the use of 430precise vapor pressure measurements to determine the extent of solubilization of volatile nonpolar liquids in several types of surfactants, including mixed surfactants. An area of particular interest is the significant dependence of the solubilization constant upon change in the activity of the volatile solute in the surfactant solution.