ABSTRACT
Figures 22a and b show the plots of the surface tension versus total surfactant concentration in the mixed surfactant systems of NaGCDCC122E4, NaGCDC-C10E8, NaGUDC-C122E4, and NaGUDC-C10E8, respectively. These curves show a breakpoint corresponding to the CMC. CMC values for NaGCDC, NaGUDC, C122E4 and C10E8 were for about 2, 30,2 and 1 mM, respectively. This means that NaGCDC, C122E4, and C10E8 molecules form micelles more easily compared with NaGUDC having a large CMC value since the NaGUDC molecule is hydrophilic. The CMC values for mixtures of bile salts and C122E4 did not change with the mole fraction of bile salt, but those for mixtures of bile salts and C10E8 changed largely.
