Abstract
The surface tension of aqueous solutions of mixed surfactant system was measured;sodium 3, 6, 9-trioxaicosanoate(ECL) -hexadecyl poly (oxyethylene) ether (POE), and ECL-sodium dodecyl sulfate (SDS). In the case of ECL-POE system, the surface tension was considerably changed with increasing molar fraction of ECL at a given concentration above the cmc. However, in the case of ECL-SDS system, the surface tension was nearly equal to that of ECL alone in spite of increase of molar fraction of SDS. From the surface tension values given, the compositions in the bulk phase and in the micellar phase were obtained. In the case of ECL-POE system, ECL molecules were easy to migrate from the bulk phase to the micellar phase. On the other hand, in the case of ECL-SDS system, ECL molecules were easy to migrate from the micellar phase to the bulk phase. This effect may be attributed to the presence bath of nonionic and anionic properties in ECL molecules.
