The isothermal phase diagram for the system of sodium dodecyl sulfonate (As)/n-C5H11OH/H2O has been determined at 30℃. With small angle X-rfay diffraction, we investigated the liquid crystal area in the phase diagram. The results showed that all the liquid crystal is lamellar at certain temperature. Layer distance of liquid crystal increases with the increasing of water content and decreases with the increasing of n-C5H11OH content. The water permeability value not only depends on the water content, but also is affected by the alcohol content. The ESR studies showed that the structure parameter of the probe in the liquid crystal region is 0.32±0.02. The anisotropic degree of the probe rotating motion in the W/O and O/W micelle region increases with the increasing of water and oil content, respectively.

Key words: WATER, TERNARY SYSTEM, LIQUID CRYSTAL, ELECTRON SPIN RESONANCE, PENTANOL, PHASE DIAGRAM