In addition, the viscosity has a tendency to increase when salt was added to the solution. Lamellar phase was found in the high viscosity samples in which the cationic and anionic surfactant are in 1 : 3 or 3 : 1 stoichiometry. In the surfactant rich phase of ATPS or in the adjacent stoichiometric state of ATPS, the system has high viscosity because of its long range ordered structure. Experimental investigations reveal two symmetrical aqueous two-phase systems (ATPS) in ternary phase diagram of SDS/CTAB/H2O system. The rheological properties and microstructure were investigated using a rheostat and freeze-fracture technique and are shown to be closely related to the phase behavior. Phase behavior of mixed sodium dodecyl sulfate (SDS) and cetyl trimethyl ammonium bromide (CTAB) aqueous solution were studied. Qingdao 266042, Shandong, China **College of Chemistry and Environmental Engineering, Shangdong University of Science and Technology *College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology RHEOLOGY AND MICROSTRUCTURE STUDIES OF SDS/CTAB/H2O SYSTEM
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